{"id":55469,"date":"2026-06-30T08:18:22","date_gmt":"2026-06-30T08:18:22","guid":{"rendered":"https:\/\/staging.pageloot.com\/uncategorized\/how-to-resize-a-qr-code\/"},"modified":"2026-07-02T17:07:07","modified_gmt":"2026-07-02T17:07:07","slug":"resize-a-qr-code","status":"publish","type":"post","link":"https:\/\/pageloot.com\/vi\/how-to\/resize-a-qr-code\/","title":{"rendered":"C\u00e1ch thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u00e3 QR m\u00e0 kh\u00f4ng l\u00e0m gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng qu\u00e9t"},"content":{"rendered":"<p class=\"wp-block-paragraph\">B\u1ea1n \u0111ang c\u1ed1 g\u1eafng thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u00e3 QR ch\u1ec9 \u0111\u1ec3 nh\u1eadn \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 m\u1edd, kh\u00f4ng th\u1ec3 qu\u00e9t \u0111\u01b0\u1ee3c? Sai k\u00edch th\u01b0\u1edbc \u2013 ho\u1eb7c s\u1eed d\u1ee5ng sai \u0111\u1ecbnh d\u1ea1ng t\u1ec7p \u2013 c\u00f3 th\u1ec3 khi\u1ebfn m\u00e3 QR c\u1ee7a b\u1ea1n ho\u00e0n to\u00e0n v\u00f4 d\u1ee5ng sau khi in. H\u01b0\u1edbng d\u1eabn n\u00e0y s\u1ebd ch\u1ec9 cho b\u1ea1n ch\u00ednh x\u00e1c c\u00e1ch thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u00e3 QR m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c, bao g\u1ed3m c\u00e1c \u0111\u1ecbnh d\u1ea1ng t\u1ec7p, quy t\u1eafc k\u00edch th\u01b0\u1edbc, y\u00eau c\u1ea7u \u0111\u1ed9 ph\u00e2n gi\u1ea3i v\u00e0 nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn nh\u1ea5t c\u1ea7n tr\u00e1nh.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">T\u1ea1i sao vi\u1ec7c thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u00e3 QR l\u1ea1i sai<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">H\u1ea7u h\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 ch\u1ea5t l\u01b0\u1ee3ng m\u00e3 QR \u0111\u1ec1u xu\u1ea5t ph\u00e1t t\u1eeb m\u1ed9t trong hai v\u1ea5n \u0111\u1ec1: b\u1eaft \u0111\u1ea7u v\u1edbi \u0111\u1ecbnh d\u1ea1ng t\u1ec7p sai ho\u1eb7c ph\u00f3ng to h\u00ecnh \u1ea3nh v\u01b0\u1ee3t qu\u00e1 kh\u1ea3 n\u0103ng h\u1ed7 tr\u1ee3 c\u1ee7a \u0111\u1ed9 ph\u00e2n gi\u1ea3i.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi b\u1ea1n l\u1ea5y m\u1ed9t h\u00ecnh \u1ea3nh raster c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i th\u1ea5p \u2013 m\u1ed9t t\u1ec7p JPEG ho\u1eb7c PNG nh\u1ecf \u2013 v\u00e0 k\u00e9o gi\u00e3n n\u00f3 l\u1edbn h\u01a1n trong ph\u1ea7n m\u1ec1m thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n, m\u00e1y qu\u00e9t ph\u1ea3i \u0111\u1ecdc c\u00e1c m\u00f4-\u0111un m\u1edd, kh\u00f4ng r\u00f5 r\u00e0ng thay v\u00ec c\u00e1c \u00f4 vu\u00f4ng \u0111en tr\u1eafng s\u1eafc n\u00e9t. K\u00e9o gi\u00e3n m\u00e3 QR c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i th\u1ea5p l\u00e0 m\u1ed9t trong nh\u1eefng c\u00e1ch \u0111\u00e1ng tin c\u1eady nh\u1ea5t \u0111\u1ec3 t\u1ea1o ra m\u1ed9t <a href=\"https:\/\/pageloot.com\/vi\/blog\/qr-code-print-resolution-guide\/\">k\u1ebft qu\u1ea3 in m\u1edd, kh\u00f4ng th\u1ec3 qu\u00e9t \u0111\u01b0\u1ee3c<\/a>. Ngo\u00e0i ra c\u00f2n c\u00f3 m\u1ed9t v\u1ea5n \u0111\u1ec1 \u00edt r\u00f5 r\u00e0ng h\u01a1n: vi\u1ec7c thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc c\u00f3 th\u1ec3 v\u00f4 t\u00ecnh l\u00e0m bi\u1ebfn d\u1ea1ng t\u1ef7 l\u1ec7 c\u1ee7a m\u00e3 ho\u1eb7c lo\u1ea1i b\u1ecf v\u00f9ng y\u00ean t\u0129nh (quiet zone) \u2013 v\u00f9ng l\u1ec1 tr\u1eafng r\u00f5 r\u00e0ng bao quanh m\u00e3 \u2013 \u0111i\u1ec1u n\u00e0y khi\u1ebfn m\u00e1y qu\u00e9t \u0111\u1ecdc sai ho\u1eb7c b\u1ecf s\u00f3t ho\u00e0n to\u00e0n m\u1eabu. Hi\u1ec3u r\u00f5 nh\u1eefng \u0111i\u1ec3m l\u1ed7i n\u00e0y tr\u01b0\u1edbc khi b\u1ea1n thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc l\u00e0 con \u0111\u01b0\u1eddng tr\u1ef1c ti\u1ebfp nh\u1ea5t \u0111\u1ec3 c\u00f3 m\u1ed9t m\u00e3 th\u1ef1c s\u1ef1 ho\u1ea1t \u0111\u1ed9ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Vector so v\u1edbi Raster: Quy\u1ebft \u0111\u1ecbnh \u0111\u1ecbnh d\u1ea1ng t\u1ec7p quan tr\u1ecdng nh\u1ea5t<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1a ch\u1ecdn c\u00f3 t\u00e1c \u0111\u1ed9ng l\u1edbn nh\u1ea5t m\u00e0 b\u1ea1n \u0111\u01b0a ra khi thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u00e3 QR l\u00e0 li\u1ec7u b\u1ea1n \u0111ang l\u00e0m vi\u1ec7c v\u1edbi t\u1ec7p vector hay raster.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u0110\u1ecbnh d\u1ea1ng vector (SVG, EPS, PDF)<\/strong> l\u01b0u tr\u1eef m\u00e3 QR d\u01b0\u1edbi d\u1ea1ng c\u00e1c h\u01b0\u1edbng d\u1eabn to\u00e1n h\u1ecdc thay v\u00ec m\u1ed9t l\u01b0\u1edbi pixel c\u1ed1 \u0111\u1ecbnh. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 ch\u00fang c\u00f3 th\u1ec3 thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc \u0111\u1ebfn b\u1ea5t k\u1ef3 k\u00edch th\u01b0\u1edbc n\u00e0o \u2013 t\u1eeb m\u1ed9t con tem b\u01b0u ch\u00ednh \u0111\u1ebfn m\u1ed9t b\u1ea3ng qu\u1ea3ng c\u00e1o l\u1edbn \u2013 m\u00e0 kh\u00f4ng l\u00e0m m\u1ea5t \u0111i \u0111\u1ed9 s\u1eafc n\u00e9t ho\u1eb7c r\u00f5 r\u00e0ng. \u0110\u1ed1i v\u1edbi b\u1ea5t k\u1ef3 th\u1ee9 g\u00ec d\u00f9ng \u0111\u1ec3 in, vector l\u00e0 l\u1ef1a ch\u1ecdn \u0111\u00fang \u0111\u1eafn.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u0110\u1ecbnh d\u1ea1ng raster (PNG, JPEG, BMP)<\/strong> l\u01b0u tr\u1eef m\u00e3 d\u01b0\u1edbi d\u1ea1ng l\u01b0\u1edbi pixel v\u1edbi gi\u1edbi h\u1ea1n \u0111\u1ed9 ph\u00e2n gi\u1ea3i c\u1ed1 \u0111\u1ecbnh. Khi b\u1ea1n ph\u00f3ng to ch\u00fang v\u01b0\u1ee3t qu\u00e1 \u0111\u1ed9 ph\u00e2n gi\u1ea3i g\u1ed1c, ph\u1ea7n m\u1ec1m ph\u1ea3i t\u1ea1o ra d\u1eef li\u1ec7u pixel, \u0111i\u1ec1u n\u00e0y g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng m\u1edd. JPEG \u0111\u1eb7c bi\u1ec7t c\u00f3 v\u1ea5n \u0111\u1ec1 v\u00ec thu\u1eadt to\u00e1n n\u00e9n c\u1ee7a n\u00f3 l\u00e0m m\u1ecbn c\u00e1c c\u1ea1nh, tr\u1ef1c ti\u1ebfp l\u00e0m suy y\u1ebfu \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n s\u1eafc n\u00e9t m\u00e0 m\u00e1y qu\u00e9t QR c\u1ea7n \u0111\u1ec3 \u0111\u1ecdc t\u1eebng m\u00f4-\u0111un.<\/p>\n\n\n\n<figure>\n<table>\n<thead>\n<tr>\n<th>\u0111\u1ecbnh d\u1ea1ng<\/th>\n<th>Thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc kh\u00f4ng m\u1ea5t ch\u1ea5t l\u01b0\u1ee3ng<\/th>\n<th>\u0110\u1ec1 ngh\u1ecb cho<\/th>\n<th>Ghi ch\u00fa<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>SVG<\/td>\n<td>\u0110\u00fang<\/td>\n<td>In \u1ea5n, \u0111\u1ecbnh d\u1ea1ng l\u1edbn<\/td>\n<td>T\u1ed1t nh\u1ea5t n\u00f3i chung \u0111\u1ec3 thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc<\/td>\n<\/tr>\n<tr>\n<td>EPS<\/td>\n<td>\u0110\u00fang<\/td>\n<td>In \u1ea5n chuy\u00ean nghi\u1ec7p<\/td>\n<td>Ti\u00eau chu\u1ea9n trong quy tr\u00ecnh thi\u1ebft k\u1ebf in \u1ea5n<\/td>\n<\/tr>\n<tr>\n<td>PDF<\/td>\n<td>\u0110\u00fang<\/td>\n<td>In \u1ea5n, chia s\u1ebb<\/td>\n<td>B\u1ea3o to\u00e0n d\u1eef li\u1ec7u vector<\/td>\n<\/tr>\n<tr>\n<td>PNG<\/td>\n<td>Kh\u00f4ng (\u0111\u1ed9 ph\u00e2n gi\u1ea3i c\u1ed1 \u0111\u1ecbnh)<\/td>\n<td>Web, hi\u1ec3n th\u1ecb k\u1ef9 thu\u1eadt s\u1ed1<\/td>\n<td>Ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c \u1edf \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao<\/td>\n<\/tr>\n<tr>\n<td>JPEG<\/td>\n<td>Kh\u00f4ng (n\u00e9n m\u1ea5t d\u1eef li\u1ec7u)<\/td>\n<td>Kh\u00f4ng c\u00e1i n\u00e0o<\/td>\n<td>Ho\u00e0n to\u00e0n tr\u00e1nh d\u00f9ng cho m\u00e3 QR<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Khi b\u1ea1n t\u1ea3i xu\u1ed1ng m\u00e3 QR \u0111\u1ec3 in, lu\u00f4n ch\u1ecdn SVG ho\u1eb7c EPS. Khi b\u1ea1n c\u1ea7n m\u1ed9t t\u1ec7p raster cho m\u00e0n h\u00ecnh k\u1ef9 thu\u1eadt s\u1ed1 ho\u1eb7c m\u1ed9t n\u1ec1n t\u1ea3ng kh\u00f4ng ch\u1ea5p nh\u1eadn \u0111\u1ecbnh d\u1ea1ng vector, xu\u1ea5t m\u1ed9t t\u1ec7p PNG c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao \u2013 kh\u00f4ng bao gi\u1edd l\u00e0 JPEG.<\/p>\n\n\n\n<blockquote class=\"is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>T\u1ea1o m\u00e3 QR s\u1eb5n s\u00e0ng in v\u1edbi \u0111\u1ecbnh d\u1ea1ng ph\u00f9 h\u1ee3p<\/strong> T\u1ea1o m\u00e3 QR c\u1ee7a b\u1ea1n v\u00e0 t\u1ea3i xu\u1ed1ng d\u01b0\u1edbi d\u1ea1ng t\u1ec7p SVG, EPS ho\u1eb7c PDF s\u1eb5n s\u00e0ng in b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng <a href=\"https:\/\/pageloot.com\/vi\/qr-code-generator\/\">Tr\u00ecnh t\u1ea1o m\u00e3 QR Pageloot<\/a>. Kh\u00f4ng y\u00eau c\u1ea7u ph\u1ea7n m\u1ec1m thi\u1ebft k\u1ebf.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Quy t\u1eafc \u0111\u1ed9 ph\u00e2n gi\u1ea3i cho t\u1ec7p Raster<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu b\u1ea1n \u0111ang l\u00e0m vi\u1ec7c v\u1edbi t\u1ec7p PNG \u0111\u1ec3 in, \u0111\u1ed9 ph\u00e2n gi\u1ea3i \u2013 \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng DPI (dots per inch) \u2013 quy\u1ebft \u0111\u1ecbnh li\u1ec7u m\u00e3 c\u00f3 gi\u1eef \u0111\u01b0\u1ee3c \u0111\u1ed9 s\u1eafc n\u00e9t \u1edf k\u00edch th\u01b0\u1edbc in cu\u1ed1i c\u00f9ng hay kh\u00f4ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Ti\u00eau chu\u1ea9n t\u1ed1i thi\u1ec3u \u0111\u1ec3 in l\u00e0 300 DPI \u1edf k\u00edch th\u01b0\u1edbc in cu\u1ed1i c\u00f9ng.<\/strong> \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 k\u00edch th\u01b0\u1edbc pixel c\u1ee7a t\u1ec7p h\u00ecnh \u1ea3nh c\u1ee7a b\u1ea1n ph\u1ea3i kh\u1edbp v\u1edbi k\u00edch th\u01b0\u1edbc v\u1eadt l\u00fd d\u1ef1 \u0111\u1ecbnh \u1edf m\u1eadt \u0111\u1ed9 \u0111\u00f3. V\u00ed d\u1ee5:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>M\u1ed9t m\u00e3 QR \u0111\u01b0\u1ee3c in \u1edf <strong>1 inch x 1 inch<\/strong> c\u1ea7n \u00edt nh\u1ea5t <strong>300 \u00d7 300 pixel<\/strong><\/li>\n<li>M\u1ed9t m\u00e3 QR \u0111\u01b0\u1ee3c in \u1edf <strong>4 inch \u00d7 4 inch<\/strong> c\u1ea7n \u00edt nh\u1ea5t <strong>200 \u00d7 1.200 pixel<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu t\u1ec7p c\u1ee7a b\u1ea1n kh\u00f4ng \u0111\u1ea1t ng\u01b0\u1ee1ng n\u00e0y \u1edf k\u00edch th\u01b0\u1edbc m\u1ee5c ti\u00eau c\u1ee7a b\u1ea1n, c\u00e1c m\u00f4-\u0111un ri\u00eang l\u1ebb \u2013 c\u00e1c \u00f4 vu\u00f4ng nh\u1ecf mang d\u1eef li\u1ec7u QR \u2013 s\u1ebd b\u1ecb m\u1edd \u0111i. T\u1ea1i th\u1eddi \u0111i\u1ec3m \u0111\u00f3, m\u00e1y qu\u00e9t kh\u00f4ng th\u1ec3 ph\u00e2n bi\u1ec7t \u0111\u01b0\u1ee3c m\u00e0u t\u1ed1i v\u1edbi m\u00e0u s\u00e1ng n\u1eefa, v\u00e0 m\u00e3 s\u1ebd kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng. \u0110\u1ed1i v\u1edbi m\u00e0n h\u00ecnh k\u1ef9 thu\u1eadt s\u1ed1, t\u1ed1i thi\u1ec3u kho\u1ea3ng <strong>240 \u00d7 240 pixel<\/strong> l\u00e0 m\u1ed9t h\u01b0\u1edbng d\u1eabn th\u1ef1c t\u1ebf cho c\u00e1c m\u00e3 hi\u1ec3n th\u1ecb tr\u00ean m\u00e0n h\u00ecnh, m\u1eb7c d\u00f9 l\u1edbn h\u01a1n lu\u00f4n an to\u00e0n h\u01a1n cho vi\u1ec7c ph\u00f3ng to v\u00e0 t\u01b0\u01a1ng th\u00edch \u0111a thi\u1ebft b\u1ecb. Gi\u1ea3i ph\u00e1p s\u1ea1ch h\u01a1n \u0111\u1ec3 in l\u00e0 b\u1ecf qua ho\u00e0n to\u00e0n raster v\u00e0 s\u1eed d\u1ee5ng t\u1ec7p vector, \u0111i\u1ec1u n\u00e0y mang l\u1ea1i cho b\u1ea1n kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng v\u00f4 h\u1ea1n m\u00e0 kh\u00f4ng c\u1ea7n lo l\u1eafng v\u1ec1 \u0111\u1ed9 ph\u00e2n gi\u1ea3i.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00e1ch thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u00e3 QR t\u1eebng b\u01b0\u1edbc<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc 1: B\u1eaft \u0111\u1ea7u v\u1edbi t\u1ec7p ngu\u1ed3n ph\u00f9 h\u1ee3p<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1ea3i xu\u1ed1ng ho\u1eb7c xu\u1ea5t m\u00e3 QR c\u1ee7a b\u1ea1n \u1edf \u0111\u1ecbnh d\u1ea1ng SVG ho\u1eb7c EPS n\u1ebfu b\u1ea1n \u0111\u1ecbnh in. N\u1ebfu b\u1ea1n ch\u1ec9 c\u00f3 t\u1ec7p raster, h\u00e3y x\u00e1c minh r\u1eb1ng k\u00edch th\u01b0\u1edbc pixel h\u1ed7 tr\u1ee3 300 DPI \u1edf k\u00edch th\u01b0\u1edbc in m\u1ee5c ti\u00eau c\u1ee7a b\u1ea1n tr\u01b0\u1edbc khi thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc. M\u00e3 QR PNG c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng t\u1ed1t cho c\u00e1c v\u1ecb tr\u00ed k\u1ef9 thu\u1eadt s\u1ed1 khi \u0111\u01b0\u1ee3c xu\u1ea5t \u1edf \u0111\u1ed9 ph\u00e2n gi\u1ea3i \u0111\u1ee7 \u2013 b\u1ea1n c\u00f3 th\u1ec3 t\u1ea1o m\u1ed9t m\u00e3 tr\u1ef1c ti\u1ebfp b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng <a href=\"https:\/\/pageloot.com\/vi\/qr-code-png\/\">T\u1ea1o m\u00e3 QR PNG<\/a> v\u00e0 s\u1eed d\u1ee5ng n\u00f3 \u1edf b\u1ea5t c\u1ee9 n\u01a1i n\u00e0o y\u00eau c\u1ea7u \u0111\u1ed9 trong su\u1ed1t ho\u1eb7c kh\u1ea3 n\u0103ng t\u01b0\u01a1ng th\u00edch raster.<\/p>\n\n\n\n<figure><img decoding=\"async\" src=\"https:\/\/pageloot.com\/wp-content\/uploads\/2026\/06\/content-asset-cfd577-39bc4f04dd47.webp\" alt=\"C\u00e1c b\u01b0\u1edbc thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc QR\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc 2: Thay \u0111\u1ed5i t\u1ef7 l\u1ec7 theo t\u1ef7 l\u1ec7<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Lu\u00f4n duy tr\u00ec t\u1ef7 l\u1ec7 khung h\u00ecnh g\u1ed1c khi thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc. M\u00e3 QR theo \u0111\u1ecbnh ngh\u0129a l\u00e0 h\u00ecnh vu\u00f4ng, v\u00e0 vi\u1ec7c k\u00e9o gi\u00e3n ch\u00fang theo chi\u1ec1u ngang ho\u1eb7c chi\u1ec1u d\u1ecdc s\u1ebd l\u00e0m bi\u1ebfn d\u1ea1ng c\u00e1c m\u00f4-\u0111un t\u1eeb h\u00ecnh vu\u00f4ng th\u00e0nh h\u00ecnh ch\u1eef nh\u1eadt, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 g\u00e2y nh\u1ea7m l\u1eabn ho\u1eb7c l\u00e0m h\u1ecfng m\u00e1y qu\u00e9t. Trong b\u1ea5t k\u1ef3 \u1ee9ng d\u1ee5ng thi\u1ebft k\u1ebf n\u00e0o \u2013 Illustrator, Canva, InDesign, Photoshop \u2013 h\u00e3y kh\u00f3a t\u1ef7 l\u1ec7 khung h\u00ecnh tr\u01b0\u1edbc khi k\u00e9o m\u1ed9t g\u00f3c. Ngay c\u1ea3 m\u1ed9t bi\u1ebfn d\u1ea1ng nh\u1ecf c\u0169ng \u0111\u1ee7 \u0111\u1ec3 g\u00e2y ra v\u1ea5n \u0111\u1ec1 v\u1edbi c\u00e1c tri\u1ec3n khai m\u00e1y qu\u00e9t nghi\u00eam ng\u1eb7t h\u01a1n.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc 3: Gi\u1eef V\u00f9ng Y\u00ean T\u0129nh<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00f9ng y\u00ean t\u0129nh l\u00e0 \u0111\u01b0\u1eddng vi\u1ec1n tr\u1eafng r\u00f5 r\u00e0ng bao quanh m\u00e3 QR \u1edf c\u1ea3 b\u1ed1n ph\u00eda. Ti\u00eau chu\u1ea9n ISO\/IEC 18004 quy \u0111\u1ecbnh r\u1eb1ng l\u1ec1 n\u00e0y ph\u1ea3i r\u1ed9ng \u00edt nh\u1ea5t b\u1ed1n m\u00f4-\u0111un \u1edf m\u1ed7i ph\u00eda. Khi b\u1ea1n thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u1ed9t m\u00e3 QR v\u00e0 \u0111\u1eb7t n\u00f3 v\u00e0o m\u1ed9t thi\u1ebft k\u1ebf l\u1edbn h\u01a1n, v\u00f9ng n\u00e0y th\u01b0\u1eddng l\u00e0 th\u1ee9 \u0111\u1ea7u ti\u00ean b\u1ecb c\u1eaft ho\u1eb7c b\u1ecb c\u00e1c y\u1ebfu t\u1ed1 thi\u1ebft k\u1ebf kh\u00e1c l\u1ea5n chi\u1ebfm. N\u1ebfu m\u1ed7i m\u00f4-\u0111un trong m\u00e3 c\u1ee7a b\u1ea1n r\u1ed9ng 2 mm, v\u00f9ng y\u00ean t\u0129nh c\u1ee7a b\u1ea1n ph\u1ea3i r\u1ed9ng \u00edt nh\u1ea5t 8 mm \u1edf t\u1ea5t c\u1ea3 c\u00e1c ph\u00eda. H\u00e3y coi kh\u00f4ng gian n\u00e0y l\u00e0 kh\u00f4ng th\u1ec3 th\u01b0\u01a1ng l\u01b0\u1ee3ng \u2013 vi\u1ec7c lo\u1ea1i b\u1ecf n\u00f3 s\u1ebd l\u00e0m h\u1ecfng kh\u1ea3 n\u0103ng nh\u1eadn di\u1ec7n c\u1ee7a m\u00e1y qu\u00e9t.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc 4: Ki\u1ec3m tra \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n sau khi thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc l\u00ean n\u1ec1n m\u00e0u ho\u1eb7c n\u1ec1n c\u00f3 h\u1ecda ti\u1ebft c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n hi\u1ec7u qu\u1ea3 gi\u1eefa c\u00e1c m\u00f4-\u0111un c\u1ee7a m\u00e3 v\u00e0 m\u00f4i tr\u01b0\u1eddng xung quanh. M\u00e1y qu\u00e9t d\u1ef1a v\u00e0o s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c v\u00f9ng t\u1ed1i v\u00e0 s\u00e1ng \u0111\u1ec3 \u0111\u1ecdc m\u00e3. S\u1ef1 k\u1ebft h\u1ee3p an to\u00e0n nh\u1ea5t v\u1eabn l\u00e0 c\u00e1c m\u00f4-\u0111un t\u1ed1i tr\u00ean n\u1ec1n s\u00e1ng \u2013 \u0111en tr\u00ean tr\u1eafng cung c\u1ea5p t\u1ef7 l\u1ec7 t\u01b0\u01a1ng ph\u1ea3n 21:1. Nh\u1eafm \u0111\u1ebfn t\u1ef7 l\u1ec7 t\u01b0\u01a1ng ph\u1ea3n t\u1ed1i thi\u1ec3u l\u00e0 <strong>4:1<\/strong> gi\u1eefa m\u00e0u ti\u1ec1n c\u1ea3nh v\u00e0 m\u00e0u n\u1ec1n, v\u00e0 tr\u00e1nh \u0111\u1eb7t m\u00e3 tr\u00ean c\u00e1c gradient, h\u1ecda ti\u1ebft ph\u1ee9c t\u1ea1p ho\u1eb7c b\u1ec1 m\u1eb7t ph\u1ea3n chi\u1ebfu. \u0110\u1ec3 \u0111\u01b0\u1ee3c h\u01b0\u1edbng d\u1eabn chi ti\u1ebft, h\u00e3y xem <a href=\"https:\/\/pageloot.com\/vi\/blog\/qr-code-color-contrast-best-practices\/\">c\u00e1c ph\u01b0\u01a1ng ph\u00e1p hay nh\u1ea5t v\u1ec1 \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n m\u00e0u c\u1ee7a m\u00e3 QR<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc 5: Ki\u1ec3m tra tr\u01b0\u1edbc khi in<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">In m\u1ed9t b\u1ea3n th\u1eed \u1edf k\u00edch th\u01b0\u1edbc ch\u00ednh x\u00e1c d\u1ef1 \u0111\u1ecbnh tr\u00ean v\u1eadt li\u1ec7u ch\u00ednh x\u00e1c d\u1ef1 \u0111\u1ecbnh, sau \u0111\u00f3 ki\u1ec3m tra v\u1edbi nhi\u1ec1u thi\u1ebft b\u1ecb \u2013 c\u1ea3 iOS v\u00e0 Android \u2013 tr\u01b0\u1edbc khi cam k\u1ebft s\u1ea3n xu\u1ea5t h\u00e0ng lo\u1ea1t. Ki\u1ec3m tra \u1edf kho\u1ea3ng c\u00e1ch qu\u00e9t th\u1ef1c t\u1ebf m\u00e0 ng\u01b0\u1eddi d\u00f9ng s\u1ebd tr\u1ea3i nghi\u1ec7m. M\u1ed9t m\u00e3 qu\u00e9t ho\u00e0n h\u1ea3o \u1edf kho\u1ea3ng c\u00e1ch s\u1ea3i tay c\u00f3 th\u1ec3 th\u1ea5t b\u1ea1i \u1edf kho\u1ea3ng c\u00e1ch th\u1ef1c t\u1ebf n\u00f3 \u0111\u01b0\u1ee3c \u0111\u1eb7t. Xem <a href=\"https:\/\/pageloot.com\/vi\/blog\/how-to-test-qr-codes-for-mobile-usability\/\">c\u00e1ch ki\u1ec3m tra m\u00e3 QR v\u1ec1 kh\u1ea3 n\u0103ng s\u1eed d\u1ee5ng tr\u00ean thi\u1ebft b\u1ecb di \u0111\u1ed9ng<\/a> \u0111\u1ec3 c\u00f3 danh s\u00e1ch ki\u1ec3m tra \u0111\u1ea7y \u0111\u1ee7.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">H\u01b0\u1edbng d\u1eabn v\u1ec1 k\u00edch th\u01b0\u1edbc t\u1ed1i thi\u1ec3u v\u00e0 t\u1ed1i \u0111a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u00e3 QR m\u1ed9t c\u00e1ch c\u00f3 tr\u00e1ch nhi\u1ec7m c\u00f3 ngh\u0129a l\u00e0 bi\u1ebft c\u00e1c gi\u1edbi h\u1ea1n k\u00edch th\u01b0\u1edbc cho tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng c\u1ee5 th\u1ec3 c\u1ee7a b\u1ea1n. Quy t\u1eafc c\u1ed1t l\u00f5i l\u00e0 <strong>t\u1ef7 l\u1ec7 kho\u1ea3ng c\u00e1ch-\u0111\u1ebfn-k\u00edch th\u01b0\u1edbc 10:1<\/strong>: kho\u1ea3ng c\u00e1ch qu\u00e9t t\u1ed1i \u0111a d\u1ef1 \u0111\u1ecbnh ph\u1ea3i x\u1ea5p x\u1ec9 m\u01b0\u1eddi l\u1ea7n chi\u1ec1u r\u1ed9ng c\u1ee7a m\u00e3 QR. M\u1ed9t m\u00e3 \u0111\u01b0\u1ee3c qu\u00e9t t\u1eeb kho\u1ea3ng c\u00e1ch 20 inch ph\u1ea3i r\u1ed9ng \u00edt nh\u1ea5t 2 inch; m\u1ed9t m\u00e3 \u0111\u01b0\u1ee3c qu\u00e9t t\u1eeb kho\u1ea3ng c\u00e1ch 5 feet ph\u1ea3i r\u1ed9ng \u00edt nh\u1ea5t 6 inch; m\u1ed9t m\u00e3 tr\u00ean b\u1ea3ng qu\u1ea3ng c\u00e1o \u0111\u01b0\u1ee3c qu\u00e9t t\u1eeb kho\u1ea3ng c\u00e1ch 30 feet ph\u1ea3i r\u1ed9ng \u00edt nh\u1ea5t 36 inch.<\/p>\n\n\n\n<figure><img decoding=\"async\" src=\"https:\/\/pageloot.com\/wp-content\/uploads\/2026\/06\/content-asset-540e38-5d59bc388c5c.webp\" alt=\"Quy t\u1eafc k\u00edch th\u01b0\u1edbc QR\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng in \u1ea5n ph\u1ed5 bi\u1ebfn, \u0111\u00e2y l\u00e0 nh\u1eefng \u0111i\u1ec3m kh\u1edfi \u0111\u1ea7u \u0111\u00e1ng tin c\u1eady:<\/p>\n\n\n\n<figure>\n<table>\n<thead>\n<tr>\n<th>Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/th>\n<th>K\u00edch th\u01b0\u1edbc t\u1ed1i thi\u1ec3u \u0111\u01b0\u1ee3c \u0111\u1ec1 xu\u1ea5t<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Danh thi\u1ebfp<\/td>\n<td>0.8 \u00d7 0.8 inch (2 \u00d7 2 cm)<\/td>\n<\/tr>\n<tr>\n<td>T\u1edd r\u01a1i v\u00e0 t\u00e0i li\u1ec7u qu\u1ea3ng c\u00e1o<\/td>\n<td>1.2 \u00d7 1.2 inch (3 \u00d7 3 cm)<\/td>\n<\/tr>\n<tr>\n<td>\u00c1p ph\u00edch v\u00e0 b\u1ea3ng hi\u1ec7u<\/td>\n<td>6 \u00d7 1.6 in (4 \u00d7 4 cm)<\/td>\n<\/tr>\n<tr>\n<td>B\u1ea3ng qu\u1ea3ng c\u00e1o v\u00e0 bi\u1ec3u ng\u1eef<\/td>\n<td>16 \u00d7 16 in (40 \u00d7 40 cm) ho\u1eb7c l\u1edbn h\u01a1n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng danh thi\u1ebfp, 0.8 \u00d7 0.8 inch l\u00e0 k\u00edch th\u01b0\u1edbc t\u1ed1i thi\u1ec3u th\u1ef1c t\u1ebf \u0111\u1ec3 qu\u00e9t t\u1ea7m g\u1ea7n \u0111\u00e1ng tin c\u1eady \u2013 vi\u1ec7c thu nh\u1ecf h\u01a1n s\u1ebd l\u00e0m t\u0103ng \u0111\u00e1ng k\u1ec3 nguy c\u01a1 qu\u00e9t th\u1ea5t b\u1ea1i. Xem <a href=\"https:\/\/pageloot.com\/vi\/blog\/best-qr-code-sizes-for-business-cards\/\">h\u01b0\u1edbng d\u1eabn v\u1ec1 k\u00edch th\u01b0\u1edbc m\u00e3 QR cho danh thi\u1ebfp<\/a> \u0111\u1ec3 bi\u1ebft c\u00e1c khuy\u1ebfn ngh\u1ecb c\u1ee5 th\u1ec3 v\u1ec1 \u0111\u1ecbnh d\u1ea1ng \u0111\u00f3. Kh\u00f4ng c\u00f3 gi\u1edbi h\u1ea1n k\u00edch th\u01b0\u1edbc t\u1ed1i \u0111a ch\u00ednh th\u1ee9c; h\u00e3y ph\u00f3ng to khi c\u1ea7n thi\u1ebft d\u1ef1a tr\u00ean kho\u1ea3ng c\u00e1ch qu\u00e9t. \u0110\u1ec3 c\u00f3 ph\u00e2n t\u00edch to\u00e0n di\u1ec7n tr\u00ean m\u1ecdi tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng, <a href=\"https:\/\/pageloot.com\/vi\/how-to\/qr-code-size-guide\/\">h\u01b0\u1edbng d\u1eabn k\u00edch th\u01b0\u1edbc m\u00e3 QR c\u1ee7a ch\u00fang t\u00f4i<\/a> bao g\u1ed3m m\u1ecdi th\u1ee9 t\u1eeb danh thi\u1ebfp \u0111\u1ebfn b\u1ea3ng qu\u1ea3ng c\u00e1o. B\u1ea1n c\u0169ng c\u00f3 th\u1ec3 kh\u00e1m ph\u00e1 <a href=\"https:\/\/pageloot.com\/vi\/blog\/how-qr-code-size-impacts-visibility\/\">c\u00e1ch k\u00edch th\u01b0\u1edbc m\u00e3 QR \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng hi\u1ec3n th\u1ecb<\/a> \u0111\u1ec3 hi\u1ec3u m\u1ed1i quan h\u1ec7 r\u1ed9ng h\u01a1n gi\u1eefa k\u00edch th\u01b0\u1edbc v\u00e0 th\u00e0nh c\u00f4ng khi qu\u00e9t.<\/p>\n\n\n\n<blockquote class=\"is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>C\u1ea7n m\u1ed9t m\u00e3 QR cho danh thi\u1ebfp c\u1ee7a b\u1ea1n?<\/strong> S\u1eed d\u1ee5ng <a href=\"https:\/\/pageloot.com\/vi\/business-card-qr-code-generator\/\">T\u1ea1o m\u00e3 QR danh thi\u1ebfp<\/a> \u0111\u1ec3 t\u1ea1o m\u1ed9t m\u00e3 c\u00f3 k\u00edch th\u01b0\u1edbc v\u00e0 thi\u1ebft k\u1ebf d\u00e0nh cho in danh thi\u1ebfp, bao g\u1ed3m xu\u1ea5t SVG.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">M\u1eadt \u0111\u1ed9 d\u1eef li\u1ec7u \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn vi\u1ec7c thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc nh\u01b0 th\u1ebf n\u00e0o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t y\u1ebfu t\u1ed1 l\u00e0m ph\u1ee9c t\u1ea1p vi\u1ec7c thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc l\u00e0 m\u1eadt \u0111\u1ed9 d\u1eef li\u1ec7u \u2013 l\u01b0\u1ee3ng th\u00f4ng tin \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a trong m\u00e3 QR. M\u00e3 QR c\u00e0ng ch\u1ee9a nhi\u1ec1u d\u1eef li\u1ec7u, l\u01b0\u1edbi m\u00f4-\u0111un c\u1ee7a n\u00f3 c\u00e0ng d\u00e0y \u0111\u1eb7c. L\u01b0\u1edbi d\u00e0y \u0111\u1eb7c h\u01a1n y\u00eau c\u1ea7u k\u00edch th\u01b0\u1edbc v\u1eadt l\u00fd l\u1edbn h\u01a1n \u0111\u1ec3 gi\u1eef cho c\u00e1c m\u00f4-\u0111un ri\u00eang l\u1ebb c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c \u1edf c\u1ea5p \u0111\u1ed9 m\u00e1y \u1ea3nh.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed9t m\u00e3 QR m\u00e3 h\u00f3a m\u1ed9t URL d\u00e0i v\u1edbi c\u00e1c tham s\u1ed1 theo d\u00f5i ch\u1ee9a nhi\u1ec1u d\u1eef li\u1ec7u h\u01a1n \u0111\u00e1ng k\u1ec3 so v\u1edbi m\u1ed9t m\u00e3 tr\u1ecf \u0111\u1ebfn m\u1ed9t URL chuy\u1ec3n h\u01b0\u1edbng ng\u1eafn. Khi b\u1ea1n thu nh\u1ecf m\u1ed9t m\u00e3 c\u00f3 m\u1eadt \u0111\u1ed9 cao, c\u00e1c m\u00f4-\u0111un tr\u1edf n\u00ean qu\u00e1 nh\u1ecf \u0111\u1ec3 h\u1ea7u h\u1ebft c\u00e1c camera \u0111i\u1ec7n tho\u1ea1i th\u00f4ng minh c\u00f3 th\u1ec3 ph\u00e2n gi\u1ea3i \u0111\u00e1ng tin c\u1eady. M\u00e3 QR \u0111\u1ed9ng gi\u1ea3i quy\u1ebft tr\u1ef1c ti\u1ebfp v\u1ea5n \u0111\u1ec1 n\u00e0y. Thay v\u00ec m\u00e3 h\u00f3a m\u1ed9t URL \u0111\u00edch \u0111\u1ea7y \u0111\u1ee7, m\u1ed9t m\u00e3 \u0111\u1ed9ng m\u00e3 h\u00f3a m\u1ed9t chuy\u1ec3n h\u01b0\u1edbng n\u1ed9i b\u1ed9 ng\u1eafn, gi\u1eef cho m\u1eadt \u0111\u1ed9 d\u1eef li\u1ec7u c\u1ee7a m\u00e3 th\u1ea5p b\u1ea5t k\u1ec3 n\u00f3 tr\u1ecf \u0111\u1ebfn \u0111\u00e2u. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 b\u1ea1n c\u00f3 th\u1ec3 in m\u00e3 nh\u1ecf h\u01a1n m\u00e0 kh\u00f4ng l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng qu\u00e9t \u2013 v\u00e0 c\u1eadp nh\u1eadt \u0111\u00edch sau n\u00e0y m\u00e0 kh\u00f4ng c\u1ea7n in l\u1ea1i.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">S\u1eeda l\u1ed7i v\u00e0 dung sai thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">M\u00e3 QR bao g\u1ed3m t\u00ednh n\u0103ng s\u1eeda l\u1ed7i t\u00edch h\u1ee3p cho ph\u00e9p ch\u00fang v\u1eabn c\u00f3 th\u1ec3 qu\u00e9t \u0111\u01b0\u1ee3c ngay c\u1ea3 khi b\u1ecb h\u01b0 h\u1ecfng m\u1ed9t ph\u1ea7n ho\u1eb7c b\u1ecb che khu\u1ea5t. Ti\u00eau chu\u1ea9n ISO\/IEC 18004 \u0111\u1ecbnh ngh\u0129a b\u1ed1n c\u1ea5p \u0111\u1ed9:<\/p>\n\n\n\n<figure>\n<table>\n<thead>\n<tr>\n<th>C\u1ea5p \u0111\u1ed9<\/th>\n<th>Kh\u1ea3 n\u0103ng ph\u1ee5c h\u1ed3i<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>L (Th\u1ea5p)<\/td>\n<td>~7% d\u1eef li\u1ec7u<\/td>\n<\/tr>\n<tr>\n<td>M (Trung b\u00ecnh)<\/td>\n<td>~15% d\u1eef li\u1ec7u<\/td>\n<\/tr>\n<tr>\n<td>Q (T\u1ee9 ph\u00e2n v\u1ecb)<\/td>\n<td>~25% d\u1eef li\u1ec7u<\/td>\n<\/tr>\n<tr>\n<td>H (Cao)<\/td>\n<td>~30% d\u1eef li\u1ec7u<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu b\u1ea1n \u0111ang thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u00e3 QR th\u00e0nh k\u00edch th\u01b0\u1edbc nh\u1ecf h\u01a1n, ho\u1eb7c th\u00eam logo v\u00e0o trung t\u00e2m c\u1ee7a m\u00e3, vi\u1ec7c t\u0103ng m\u1ee9c \u0111\u1ed9 s\u1eeda l\u1ed7i s\u1ebd cung c\u1ea5p cho b\u1ea1n m\u1ed9t v\u00f9ng \u0111\u1ec7m ch\u1ed1ng l\u1ea1i h\u01b0 h\u1ecfng c\u1ea5p \u0111\u1ed9 m\u00f4-\u0111un ho\u1eb7c qu\u00e9t kh\u00f4ng ch\u00ednh x\u00e1c. M\u1ee9c Q ho\u1eb7c H l\u00e0 ph\u00f9 h\u1ee3p cho c\u00e1c m\u00e3 c\u00f3 th\u01b0\u01a1ng hi\u1ec7u ho\u1eb7c \u0111\u01b0\u1ee3c t\u00f9y ch\u1ec9nh nhi\u1ec1u. H\u00e3y nh\u1edb r\u1eb1ng s\u1eeda l\u1ed7i cao h\u01a1n s\u1ebd t\u0103ng m\u1eadt \u0111\u1ed9 d\u1eef li\u1ec7u, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 y\u00eau c\u1ea7u k\u00edch th\u01b0\u1edbc t\u1ed1i thi\u1ec3u l\u1edbn h\u01a1n m\u1ed9t ch\u00fat \u0111\u1ec3 b\u00f9 \u0111\u1eafp.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn khi thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc c\u1ea7n tr\u00e1nh<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>S\u1eed d\u1ee5ng \u1ea3nh ch\u1ee5p m\u00e0n h\u00ecnh l\u00e0m t\u1ec7p ngu\u1ed3n c\u1ee7a b\u1ea1n.<\/strong> \u1ea2nh ch\u1ee5p m\u00e0n h\u00ecnh l\u00e0 c\u00e1c \u1ea3nh raster c\u00f3 \u0111\u1ed9 ph\u00e2n gi\u1ea3i th\u1ea5p. Ph\u00f3ng to ch\u00fang \u0111\u1ec3 in l\u00e0 m\u1ed9t trong nh\u1eefng nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn nh\u1ea5t c\u1ee7a c\u00e1c m\u00e3 QR kh\u00f4ng th\u1ec3 qu\u00e9t \u0111\u01b0\u1ee3c.<\/li>\n<li><strong>K\u00e9o gi\u00e3n m\u00e3 kh\u00f4ng theo t\u1ef7 l\u1ec7.<\/strong> Ngay c\u1ea3 m\u1ed9t bi\u1ebfn d\u1ea1ng ngang ho\u1eb7c d\u1ecdc nh\u1ecf c\u0169ng l\u00e0m thay \u0111\u1ed5i h\u00ecnh d\u1ea1ng m\u00f4-\u0111un t\u1eeb h\u00ecnh vu\u00f4ng th\u00e0nh h\u00ecnh ch\u1eef nh\u1eadt, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 ng\u0103n m\u00e1y qu\u00e9t \u0111\u1ecdc m\u00e3 m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c.<\/li>\n<li><strong>C\u1eaft v\u00f9ng y\u00ean t\u0129nh.<\/strong> Thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc trong m\u1ed9t b\u1ed1 c\u1ee5c thi\u1ebft k\u1ebf ch\u1eadt h\u1eb9p th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn c\u00e1c y\u1ebfu t\u1ed1 kh\u00e1c l\u1ea5n v\u00e0o v\u00f9ng y\u00ean t\u0129nh. Gi\u1eef \u00edt nh\u1ea5t b\u1ed1n m\u00f4-\u0111un kh\u00f4ng gian tr\u1ed1ng \u1edf t\u1ea5t c\u1ea3 c\u00e1c c\u1ea1nh \u2013 l\u1ec1 n\u00e0y l\u00e0 m\u1ed9t y\u00eau c\u1ea7u k\u1ef9 thu\u1eadt, kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t l\u1ef1a ch\u1ecdn phong c\u00e1ch.<\/li>\n<li><strong>Gi\u1ea3 \u0111\u1ecbnh m\u1ed9t m\u00e3 ho\u1ea1t \u0111\u1ed9ng tr\u00ean m\u00e0n h\u00ecnh s\u1ebd ho\u1ea1t \u0111\u1ed9ng khi in.<\/strong> Hi\u1ec3n th\u1ecb tr\u00ean m\u00e0n h\u00ecnh v\u00e0 \u0111\u1ea7u ra in l\u00e0 nh\u1eefng m\u00f4i tr\u01b0\u1eddng kh\u00e1c nhau. M\u1ed9t m\u00e3 tr\u00f4ng s\u1eafc n\u00e9t \u1edf 72 DPI tr\u00ean m\u00e0n h\u00ecnh c\u00f3 th\u1ec3 in m\u1edd \u1edf 300 DPI n\u1ebfu \u0111\u1ed9 ph\u00e2n gi\u1ea3i t\u1ec7p c\u01a1 b\u1ea3n kh\u00f4ng h\u1ed7 tr\u1ee3 n\u00f3.<\/li>\n<li><strong>Kh\u00f4ng ki\u1ec3m tra sau khi thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc.<\/strong> Lu\u00f4n x\u00e1c minh kh\u1ea3 n\u0103ng qu\u00e9t tr\u00ean v\u1eadt li\u1ec7u cu\u1ed1i c\u00f9ng, \u1edf k\u00edch th\u01b0\u1edbc cu\u1ed1i c\u00f9ng, t\u1eeb kho\u1ea3ng c\u00e1ch qu\u00e9t d\u1ef1 \u0111\u1ecbnh.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 c\u00f3 h\u01b0\u1edbng d\u1eabn chuy\u00ean s\u00e2u h\u01a1n, <a href=\"https:\/\/pageloot.com\/vi\/blog\/qr-code-print-resolution-guide\/\">h\u01b0\u1edbng d\u1eabn \u0111\u1ed9 ph\u00e2n gi\u1ea3i in m\u00e3 QR<\/a> v\u00e0 <a href=\"https:\/\/pageloot.com\/vi\/blog\/best-practices-for-qr-code-readability\/\">c\u00e1c ph\u01b0\u01a1ng ph\u00e1p hay nh\u1ea5t \u0111\u1ec3 \u0111\u1ecdc m\u00e3 QR<\/a> bao g\u1ed3m c\u00e1c chi ti\u1ebft c\u1ee5 th\u1ec3 v\u1ec1 in \u1ea5n \u0111\u00e1ng bi\u1ebft tr\u01b0\u1edbc khi b\u1ea1n \u0111\u01b0a v\u00e0o s\u1ea3n xu\u1ea5t.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">K\u00edch th\u01b0\u1edbc cho c\u00e1c v\u1eadt li\u1ec7u in kh\u00e1c nhau<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">B\u1ec1 m\u1eb7t b\u1ea1n \u0111ang in \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn k\u00edch th\u01b0\u1edbc m\u00e3 QR c\u1ee7a b\u1ea1n c\u1ea7n ph\u1ea3i l\u00e0 bao nhi\u00eau, t\u00e1ch bi\u1ec7t kh\u1ecfi c\u00e1c c\u00e2n nh\u1eafc v\u1ec1 kho\u1ea3ng c\u00e1ch qu\u00e9t. C\u00e1c b\u1ec1 m\u1eb7t th\u00f4, c\u00f3 k\u1ebft c\u1ea5u ho\u1eb7c cong c\u00f3 th\u1ec3 l\u00e0m bi\u1ebfn d\u1ea1ng c\u00e1c m\u00f4-\u0111un v\u00e0 gi\u1ea3m \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n hi\u1ec7u qu\u1ea3, y\u00eau c\u1ea7u b\u1ea1n ph\u1ea3i ph\u00f3ng to v\u01b0\u1ee3t qu\u00e1 nh\u1eefng g\u00ec quy t\u1eafc 10:1 m\u1ed9t m\u00ecnh s\u1ebd g\u1ee3i \u00fd.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Gi\u1ea5y tr\u01a1n ho\u1eb7c b\u00eca c\u1ee9ng<\/strong> \u2013 C\u00e1c h\u01b0\u1edbng d\u1eabn k\u00edch th\u01b0\u1edbc ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng; l\u1edbp ho\u00e0n thi\u1ec7n m\u1edd \u0111\u01b0\u1ee3c \u01b0u ti\u00ean h\u01a1n l\u1edbp b\u00f3ng \u0111\u1ec3 gi\u1ea3m ch\u00f3i v\u00e0 ph\u1ea3n x\u1ea1<\/li>\n<li><strong>B\u00eca c\u1ee9ng s\u00f3ng<\/strong> \u2013 Th\u00eam 10\u201325% v\u00e0o k\u00edch th\u01b0\u1edbc t\u1ed1i thi\u1ec3u \u0111\u1ec3 b\u00f9 \u0111\u1eafp cho k\u1ebft c\u1ea5u b\u1ec1 m\u1eb7t v\u00e0 c\u00e1c b\u1ea5t th\u01b0\u1eddng \u1edf c\u1ea1nh<\/li>\n<li><strong>V\u1ea3i<\/strong> \u2013 Polyester m\u1ecbn c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c m\u1ee9c t\u1ed1i thi\u1ec3u ti\u00eau chu\u1ea9n; c\u00e1c lo\u1ea1i v\u1ea3i th\u00f4 ho\u1eb7c co gi\u00e3n th\u01b0\u1eddng y\u00eau c\u1ea7u m\u00e3 l\u1edbn h\u01a1n 25\u201350%<\/li>\n<li><strong>Kim lo\u1ea1i ho\u1eb7c th\u1ee7y tinh<\/strong> \u2013 \u0110\u1ed9 ph\u1ea3n chi\u1ebfu cao g\u00e2y ra c\u00e1c v\u1ea5n \u0111\u1ec1 khi qu\u00e9t; s\u1eed d\u1ee5ng b\u1ec1 m\u1eb7t m\u1edd ho\u1eb7c l\u1edbp ph\u1ee7 vinyl v\u00e0 t\u0103ng k\u00edch th\u01b0\u1edbc m\u00e3<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 bi\u1ebft ph\u00e2n t\u00edch \u0111\u1ea7y \u0111\u1ee7 theo lo\u1ea1i v\u1eadt li\u1ec7u, h\u00e3y xem <a href=\"https:\/\/pageloot.com\/vi\/blog\/qr-code-sizing-for-different-print-materials\/\">k\u00edch th\u01b0\u1edbc m\u00e3 QR cho c\u00e1c v\u1eadt li\u1ec7u in kh\u00e1c nhau<\/a>, v\u00e0 \u0111\u1ec3 \u0111\u01b0\u1ee3c h\u01b0\u1edbng d\u1eabn v\u1ec1 c\u00e1ch ph\u01b0\u01a1ng ph\u00e1p in \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng \u0111\u1ea7u ra, <a href=\"https:\/\/pageloot.com\/vi\/blog\/how-printing-techniques-impact-qr-code-scannability\/\">c\u00e1ch c\u00e1c k\u1ef9 thu\u1eadt in \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng qu\u00e9t m\u00e3 QR<\/a> \u0111\u00e1ng \u0111\u1ecdc tr\u01b0\u1edbc khi b\u1ea1n \u0111\u1eb7t h\u00e0ng in. \u0110\u1ed1i v\u1edbi c\u00e1c quy\u1ebft \u0111\u1ecbnh v\u1ecb tr\u00ed v\u01b0\u1ee3t ra ngo\u00e0i vi\u1ec7c \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc, <a href=\"https:\/\/pageloot.com\/vi\/blog\/ultimate-guide-to-qr-code-placement-in-marketing\/\">H\u01b0\u1edbng d\u1eabn \u0111\u1eb7t m\u00e3 QR cho ti\u1ebfp th\u1ecb<\/a> bao g\u1ed3m \u0111\u1ecbnh v\u1ecb theo lo\u1ea1i v\u1eadt li\u1ec7u v\u00e0 ng\u1eef c\u1ea3nh chi\u1ebfn d\u1ecbch.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u00e3 QR \u0111\u00fang c\u00e1ch c\u00f3 ngh\u0129a l\u00e0 ch\u1ecdn \u0111\u00fang \u0111\u1ecbnh d\u1ea1ng t\u1ec7p tr\u01b0\u1edbc khi b\u1ea1n thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc, duy tr\u00ec t\u1ef7 l\u1ec7 v\u00e0 l\u1ec1 v\u00f9ng y\u00ean t\u0129nh trong su\u1ed1t qu\u00e1 tr\u00ecnh, v\u00e0 x\u00e1c minh \u0111\u1ea7u ra c\u1ee7a b\u1ea1n \u0111\u00e1p \u1ee9ng c\u00e1c ti\u00eau chu\u1ea9n \u0111\u1ed9 ph\u00e2n gi\u1ea3i v\u00e0 \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n \u1edf k\u00edch th\u01b0\u1edbc in ho\u1eb7c hi\u1ec3n th\u1ecb cu\u1ed1i c\u00f9ng. B\u1eaft \u0111\u1ea7u v\u1edbi m\u1ed9t t\u1ec7p vector lo\u1ea1i b\u1ecf ho\u00e0n to\u00e0n h\u1ea7u h\u1ebft r\u1ee7i ro \u2013 n\u00f3 c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng s\u1ea1ch s\u1ebd theo b\u1ea5t k\u1ef3 h\u01b0\u1edbng n\u00e0o m\u00e0 kh\u00f4ng c\u00f3 gi\u1edbi h\u1ea1n \u0111\u1ed9 ph\u00e2n gi\u1ea3i m\u00e0 h\u00ecnh \u1ea3nh raster \u00e1p \u0111\u1eb7t. N\u1ebfu b\u1ea1n \u0111ang x\u00e2y d\u1ef1ng m\u00e3 QR cho c\u00e1c chi\u1ebfn d\u1ecbch \u0111ang di\u1ec5n ra, s\u1eed d\u1ee5ng m\u1ed9t <a href=\"https:\/\/pageloot.com\/vi\/qr-code-generator\/\">m\u00e3 QR \u0111\u1ed9ng<\/a> mang l\u1ea1i cho b\u1ea1n l\u1ee3i th\u1ebf b\u1ed5 sung c\u1ee7a vi\u1ec7c c\u1eadp nh\u1eadt \u0111\u00edch sau khi in, v\u00ec v\u1eady m\u1ed9t quy\u1ebft \u0111\u1ecbnh v\u1ec1 k\u00edch th\u01b0\u1edbc ho\u1eb7c v\u1ecb tr\u00ed h\u00f4m nay kh\u00f4ng kh\u00f3a b\u1ea1n v\u00e0o chi ph\u00ed in l\u1ea1i trong t\u01b0\u01a1ng lai.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n\n\n\n<div class=\"schema-faq\"><div class=\"schema-faq-section\" id=\"faq-question-21fa53946d9b\"><strong class=\"schema-faq-question\">\u0110\u1ecbnh d\u1ea1ng t\u1ec7p t\u1ed1t nh\u1ea5t l\u00e0 g\u00ec \u0111\u1ec3 thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u1ed9t m\u00e3 QR?<\/strong> <p class=\"schema-faq-answer\">SVG, EPS, ho\u1eb7c PDF l\u00e0 c\u00e1c \u0111\u1ecbnh d\u1ea1ng t\u1ed1t nh\u1ea5t \u0111\u1ec3 thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc v\u00ec ch\u00fang d\u1ef1a tr\u00ean vector v\u00e0 c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng \u0111\u1ebfn b\u1ea5t k\u1ef3 k\u00edch th\u01b0\u1edbc n\u00e0o m\u00e0 kh\u00f4ng l\u00e0m m\u1ea5t \u0111\u1ed9 s\u1eafc n\u00e9t. PNG c\u00f3 th\u1ec3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c \u0111\u1ec3 s\u1eed d\u1ee5ng k\u1ef9 thu\u1eadt s\u1ed1 khi \u0111\u01b0\u1ee3c xu\u1ea5t \u1edf \u0111\u1ed9 ph\u00e2n gi\u1ea3i cao. JPEG n\u00ean \u0111\u01b0\u1ee3c tr\u00e1nh ho\u00e0n to\u00e0n \u2013 t\u00ednh n\u0103ng n\u00e9n c\u1ee7a n\u00f3 l\u00e0m m\u1ecbn c\u00e1c c\u1ea1nh s\u1eafc n\u00e9t m\u00e0 m\u00e1y qu\u00e9t c\u1ea7n \u0111\u1ec3 ph\u00e2n bi\u1ec7t t\u1eebng m\u00f4-\u0111un.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-ecf229ebd079\"><strong class=\"schema-faq-question\">M\u00e3 QR c\u00f3 th\u1ec3 nh\u1ecf \u0111\u1ebfn m\u1ee9c n\u00e0o m\u00e0 v\u1eabn c\u00f3 th\u1ec3 qu\u00e9t \u0111\u00e1ng tin c\u1eady?<\/strong> <p class=\"schema-faq-answer\">M\u1ee9c t\u1ed1i thi\u1ec3u th\u1ef1c t\u1ebf cho h\u1ea7u h\u1ebft c\u00e1c \u1ee9ng d\u1ee5ng in t\u1ea7m g\u1ea7n l\u00e0 0.8 \u00d7 0.8 inch (2 \u00d7 2 cm). Thu nh\u1ecf h\u01a1n s\u1ebd t\u0103ng nguy c\u01a1 qu\u00e9t th\u1ea5t b\u1ea1i. \u0110\u1ec3 qu\u00e9t \u1edf kho\u1ea3ng c\u00e1ch xa h\u01a1n, \u00e1p d\u1ee5ng quy t\u1eafc 10:1: chi\u1ec1u r\u1ed9ng c\u1ee7a m\u00e3 ph\u1ea3i \u00edt nh\u1ea5t b\u1eb1ng m\u1ed9t ph\u1ea7n m\u01b0\u1eddi c\u1ee7a kho\u1ea3ng c\u00e1ch qu\u00e9t t\u1ed1i \u0111a d\u1ef1 \u0111\u1ecbnh \u2013 v\u00ec v\u1eady m\u1ed9t m\u00e3 \u0111\u01b0\u1ee3c qu\u00e9t t\u1eeb kho\u1ea3ng c\u00e1ch 20 inch ph\u1ea3i r\u1ed9ng \u00edt nh\u1ea5t 2 inch.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-a44eec90afda\"><strong class=\"schema-faq-question\">Li\u1ec7u vi\u1ec7c thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u00e3 QR c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng s\u1eeda l\u1ed7i hay d\u1eef li\u1ec7u c\u1ee7a n\u00f3 kh\u00f4ng?<\/strong> <p class=\"schema-faq-answer\">Kh\u00f4ng \u2013 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a v\u00e0 m\u1ee9c \u0111\u1ed9 s\u1eeda l\u1ed7i \u0111\u01b0\u1ee3c c\u1ed1 \u0111\u1ecbnh khi m\u00e3 \u0111\u01b0\u1ee3c t\u1ea1o ra. Thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc ch\u1ec9 thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc v\u1eadt l\u00fd ho\u1eb7c pixel c\u1ee7a h\u00ecnh \u1ea3nh. \u0110i\u1ec1u m\u00e0 vi\u1ec7c thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng l\u00e0 li\u1ec7u c\u00e1c m\u00f4-\u0111un c\u00f3 c\u00f2n r\u00f5 r\u00e0ng v\u00e0 d\u1ec5 ph\u00e2n bi\u1ec7t \u1edf k\u00edch th\u01b0\u1edbc m\u1edbi hay kh\u00f4ng, \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao vi\u1ec7c duy tr\u00ec 300 DPI cho b\u1ea3n in, b\u1ea3o to\u00e0n c\u00e1c l\u1ec1 v\u00f9ng y\u00ean t\u0129nh v\u00e0 chia t\u1ef7 l\u1ec7 theo t\u1ef7 l\u1ec7 \u0111\u1ec1u l\u00e0 c\u00e1c b\u01b0\u1edbc thi\u1ebft y\u1ebfu.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p>T\u00ecm hi\u1ec3u c\u00e1ch \u0111\u1ec3 thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u1ed9t m\u00e3 QR m\u00e0 kh\u00f4ng l\u00e0m m\u1ea5t ch\u1ea5t l\u01b0\u1ee3ng qu\u00e9t. L\u00e0m theo h\u01b0\u1edbng d\u1eabn c\u1ee7a ch\u00fang t\u00f4i v\u1ec1 \u0111\u1ecbnh d\u1ea1ng vector, y\u00eau c\u1ea7u DPI v\u00e0 quy t\u1eafc chia t\u1ef7 l\u1ec7 \u0111\u1ec3 c\u00f3 k\u1ebft qu\u1ea3 in \u0111\u00e1ng tin c\u1eady.<\/p>","protected":false},"author":17,"featured_media":55356,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[6],"tags":[],"class_list":["post-55469","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.7 (Yoast SEO v28.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How to Resize a QR Code Without Losing Scan Quality<\/title>\n<meta name=\"description\" content=\"Learn how to resize a QR code without losing scan quality. Follow our guide on vector formats, DPI requirements, and scaling rules for reliable print results.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pageloot.com\/vi\/how-to\/resize-a-qr-code\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Resize a QR Code Without Losing Scan Quality\" \/>\n<meta property=\"og:description\" content=\"Learn how to resize a QR code without losing scan quality. 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Siim c\u00f3 n\u1ec1n t\u1ea3ng k\u1ef9 thu\u1eadt s\u1ed1 s\u00e2u r\u1ed9ng v\u1edbi h\u01a1n 10 n\u0103m kinh nghi\u1ec7m v\u1eefng ch\u1eafc trong l\u0129nh v\u1ef1c Ph\u1ea7n m\u1ec1m d\u01b0\u1edbi d\u1ea1ng d\u1ecbch v\u1ee5 (SaaS), m\u1ed9t minh ch\u1ee9ng cho ki\u1ebfn th\u1ee9c s\u00e2u r\u1ed9ng c\u1ee7a \u00f4ng v\u1ec1 c\u00e1c gi\u1ea3i ph\u00e1p k\u1ef9 thu\u1eadt s\u1ed1.","sameAs":["https:\/\/www.linkedin.com\/in\/siim-tiigimagi\/"]},{"@type":"Question","@id":"https:\/\/pageloot.com\/pt\/how-to\/resize-a-qr-code\/#faq-question-21fa53946d9b","position":1,"url":"https:\/\/pageloot.com\/pt\/how-to\/resize-a-qr-code\/#faq-question-21fa53946d9b","name":"\u0110\u1ecbnh d\u1ea1ng t\u1ec7p t\u1ed1t nh\u1ea5t l\u00e0 g\u00ec \u0111\u1ec3 thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u1ed9t m\u00e3 QR?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"SVG, EPS, or PDF are the best formats for resizing because they are vector-based and scale to any size without losing sharpness. PNG is acceptable for digital use when exported at high resolution. JPEG should be avoided entirely \u2013 its compression smooths the sharp edges that scanners need to distinguish each module.","inLanguage":"vi"},"inLanguage":"vi"},{"@type":"Question","@id":"https:\/\/pageloot.com\/pt\/how-to\/resize-a-qr-code\/#faq-question-ecf229ebd079","position":2,"url":"https:\/\/pageloot.com\/pt\/how-to\/resize-a-qr-code\/#faq-question-ecf229ebd079","name":"M\u00e3 QR c\u00f3 th\u1ec3 nh\u1ecf \u0111\u1ebfn m\u1ee9c n\u00e0o m\u00e0 v\u1eabn c\u00f3 th\u1ec3 qu\u00e9t \u0111\u00e1ng tin c\u1eady?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The practical minimum for most close-range print applications is 0.8 \u00d7 0.8 inches (2 \u00d7 2 cm). Going smaller increases the risk of scan failure. For scanning at greater distances, apply the 10:1 rule: the code's width should be at least one-tenth of the maximum intended scanning distance \u2013 so a code scanned from 20 inches away should be at least 2 inches wide.","inLanguage":"vi"},"inLanguage":"vi"},{"@type":"Question","@id":"https:\/\/pageloot.com\/pt\/how-to\/resize-a-qr-code\/#faq-question-a44eec90afda","position":3,"url":"https:\/\/pageloot.com\/pt\/how-to\/resize-a-qr-code\/#faq-question-a44eec90afda","name":"Li\u1ec7u vi\u1ec7c thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc m\u00e3 QR c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng s\u1eeda l\u1ed7i hay d\u1eef li\u1ec7u c\u1ee7a n\u00f3 kh\u00f4ng?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"No \u2013 the encoded data and error correction level are fixed when the code is generated. Resizing changes only the physical or pixel dimensions of the image. What resizing can affect is whether the modules remain clear and distinguishable at the new size, which is why maintaining 300 DPI for print, preserving the quiet zone margins, and scaling proportionally are all essential steps.","inLanguage":"vi"},"inLanguage":"vi"}]}},"_links":{"self":[{"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/posts\/55469","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/users\/17"}],"replies":[{"embeddable":true,"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/comments?post=55469"}],"version-history":[{"count":1,"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/posts\/55469\/revisions"}],"predecessor-version":[{"id":55529,"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/posts\/55469\/revisions\/55529"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/media\/55356"}],"wp:attachment":[{"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/media?parent=55469"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/categories?post=55469"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/tags?post=55469"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}