{"id":2119,"date":"2019-04-30T23:35:54","date_gmt":"2019-04-30T23:35:54","guid":{"rendered":"https:\/\/pageloot.com\/?p=2119"},"modified":"2026-06-10T08:17:15","modified_gmt":"2026-06-10T08:17:15","slug":"qr-code-scanner-works","status":"publish","type":"post","link":"https:\/\/pageloot.com\/vi\/how-to\/qr-code-scanner-works\/","title":{"rendered":"M\u00e1y qu\u00e9t m\u00e3 QR ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">B\u1ea1n \u0111\u00e3 bao gi\u1edd t\u1ef1 h\u1ecfi \u0111i\u1ec1u g\u00ec th\u1ef1c s\u1ef1 x\u1ea3y ra trong n\u1eeda gi\u00e2y gi\u1eefa vi\u1ec7c b\u1ea1n h\u01b0\u1edbng \u0111i\u1ec7n tho\u1ea1i v\u00e0o m\u00e3 QR v\u00e0 truy c\u1eadp m\u1ed9t trang web ch\u01b0a? Qu\u00e1 tr\u00ecnh n\u00e0y nhanh h\u01a1n v\u1ebb ngo\u00e0i c\u1ee7a n\u00f3, v\u00e0 vi\u1ec7c hi\u1ec3u r\u00f5 n\u00f3 gi\u00fap b\u1ea1n t\u1ea1o ra c\u00e1c m\u00e3 c\u00f3 th\u1ec3 qu\u00e9t \u0111\u00e1ng tin c\u1eady m\u1ecdi l\u00fac.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">M\u00e3 QR th\u1ef1c s\u1ef1 l\u00e0 g\u00ec<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">M\u00e3 QR l\u00e0 m\u1ed9t ma tr\u1eadn hai chi\u1ec1u g\u1ed3m c\u00e1c \u00f4 vu\u00f4ng \u0111en tr\u1eafng \u0111\u01b0\u1ee3c s\u1eafp x\u1ebfp theo m\u1ed9t m\u1eabu \u0111\u1ed9c \u0111\u00e1o. Kh\u00f4ng gi\u1ed1ng nh\u01b0 m\u00e3 v\u1ea1ch truy\u1ec1n th\u1ed1ng \u2013 m\u00e3 h\u00f3a d\u1eef li\u1ec7u trong m\u1ed9t \u0111\u01b0\u1eddng ngang duy nh\u1ea5t v\u1edbi \u0111\u1ed9 r\u1ed9ng thanh kh\u00e1c nhau \u2013 m\u00e3 QR l\u01b0u tr\u1eef th\u00f4ng tin c\u1ea3 theo chi\u1ec1u ngang v\u00e0 chi\u1ec1u d\u1ecdc. \u0110\u00f3 l\u00e0 \u0111i\u1ec1u mang l\u1ea1i cho n\u00f3 dung l\u01b0\u1ee3ng d\u1eef li\u1ec7u l\u1edbn h\u01a1n nhi\u1ec1u v\u00e0 gi\u00fap n\u00f3 c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c t\u1eeb nhi\u1ec1u h\u01b0\u1edbng kh\u00e1c nhau.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M\u1ed7i m\u00e3 QR \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng t\u1eeb m\u1ed9t s\u1ed1 v\u00f9ng ch\u1ee9c n\u0103ng:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>M\u1eabu \u0111\u1ecbnh v\u1ecb<\/strong> \u2013 ba \u00f4 vu\u00f4ng l\u1edbn \u1edf c\u00e1c g\u00f3c gi\u00fap m\u00e1y qu\u00e9t \u0111\u1ecbnh v\u1ecb m\u00e3, x\u00e1c \u0111\u1ecbnh h\u01b0\u1edbng c\u1ee7a n\u00f3 v\u00e0 t\u00ecm c\u00e1c c\u1ea1nh c\u1ee7a n\u00f3, ngay c\u1ea3 khi m\u00e3 b\u1ecb nghi\u00eang<\/li>\n<li><strong>M\u1eabu th\u1eddi gian<\/strong> \u2013 c\u00e1c m\u00f4-\u0111un \u0111en tr\u1eafng xen k\u1ebd ch\u1ea1y gi\u1eefa c\u00e1c m\u1eabu \u0111\u1ecbnh v\u1ecb gi\u00fap x\u00e1c \u0111\u1ecbnh c\u1ea5u tr\u00fac l\u01b0\u1edbi v\u00e0 gi\u00fap m\u00e1y qu\u00e9t \u0111\u1ecbnh c\u1ee1 ch\u00ednh x\u00e1c t\u1eebng m\u00f4-\u0111un<\/li>\n<li><strong>V\u00f9ng y\u00ean t\u0129nh<\/strong> \u2013 l\u1ec1 tr\u1eafng tr\u1ed1ng bao quanh m\u00e3, r\u1ed9ng \u00edt nh\u1ea5t b\u1ed1n m\u00f4-\u0111un, gi\u00fap t\u00e1ch n\u00f3 kh\u1ecfi c\u00e1c \u0111\u1ed3 h\u1ecda xung quanh \u0111\u1ec3 m\u00e1y qu\u00e9t c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n ranh gi\u1edbi c\u1ee7a n\u00f3<\/li>\n<li><strong>Th\u00f4ng tin \u0111\u1ecbnh d\u1ea1ng<\/strong> \u2013 m\u1ed9t khu v\u1ef1c chuy\u00ean d\u1ee5ng g\u1ea7n c\u00e1c m\u1eabu \u0111\u1ecbnh v\u1ecb l\u01b0u tr\u1eef m\u1ee9c \u0111\u1ed9 s\u1eeda l\u1ed7i v\u00e0 m\u1eabu m\u1eb7t n\u1ea1 \u0111\u1ec3 m\u00e1y qu\u00e9t bi\u1ebft ch\u00ednh x\u00e1c c\u00e1ch di\u1ec5n gi\u1ea3i d\u1eef li\u1ec7u<\/li>\n<li><strong>M\u00f4-\u0111un d\u1eef li\u1ec7u<\/strong> \u2013 c\u00e1c \u00f4 vu\u00f4ng \u0111en tr\u1eafng ri\u00eang l\u1ebb n\u01a1i ch\u1ee9a n\u1ed9i dung \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a th\u1ef1c t\u1ebf, \u0111\u01b0\u1ee3c \u0111\u1ecdc d\u01b0\u1edbi d\u1ea1ng s\u1ed1 nh\u1ecb ph\u00e2n m\u1ed9t (\u0111en) v\u00e0 kh\u00f4ng (tr\u1eafng)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">D\u1eef li\u1ec7u trong c\u00e1c m\u00f4-\u0111un \u0111\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a theo m\u1ed9t s\u1ed1 ch\u1ebf \u0111\u1ed9: ch\u1ec9 s\u1ed1, ch\u1eef v\u00e0 s\u1ed1, byte nh\u1ecb ph\u00e2n 8 bit ho\u1eb7c Kanji. M\u00e3 QR Phi\u00ean b\u1ea3n 1 l\u00e0 21\u00d721 m\u00f4-\u0111un; m\u00e3 Phi\u00ean b\u1ea3n 40 m\u1edf r\u1ed9ng l\u00ean 177\u00d7177 v\u00e0 c\u00f3 th\u1ec3 ch\u1ee9a t\u1edbi 7.089 k\u00fd t\u1ef1 s\u1ed1, 4.296 k\u00fd t\u1ef1 ch\u1eef v\u00e0 s\u1ed1 ho\u1eb7c 2.953 byte d\u1eef li\u1ec7u nh\u1ecb ph\u00e2n. T\u00ecm hi\u1ec3u th\u00eam v\u1ec1 c\u00e1ch c\u00e1c s\u1ef1 \u0111\u00e1nh \u0111\u1ed5i n\u00e0y ho\u1ea1t \u0111\u1ed9ng trong h\u01b0\u1edbng d\u1eabn v\u1ec1 <a href=\"https:\/\/pageloot.com\/vi\/how-to\/understand-qr-code-data-limits\/\">Gi\u1edbi h\u1ea1n d\u1eef li\u1ec7u m\u00e3 QR<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quy tr\u00ecnh qu\u00e9t, t\u1eebng b\u01b0\u1edbc m\u1ed9t<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Khi b\u1ea1n h\u01b0\u1edbng m\u00e1y \u1ea3nh v\u00e0o m\u00e3 QR, m\u1ed9t quy tr\u00ecnh \u0111a giai \u0111o\u1ea1n di\u1ec5n ra trong v\u00e0i mili gi\u00e2y.<\/p>\n\n\n\n<figure><img decoding=\"async\" src=\"https:\/\/pageloot.com\/wp-content\/uploads\/2026\/05\/qr-code-scanner-f7659f-f28d3d81eb7b.webp\" alt=\"Quy tr\u00ecnh qu\u00e9t QR\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc 1: Ch\u1ee5p \u1ea3nh<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Camera ch\u1ee5p l\u01b0\u1edbi hai chi\u1ec1u d\u01b0\u1edbi d\u1ea1ng h\u00ecnh \u1ea3nh tr\u1ef1c quan. \u0110\u00e2y l\u00e0 \u0111\u1ea7u v\u00e0o th\u00f4 \u2013 m\u1ed9t b\u1ee9c \u1ea3nh c\u1ee7a m\u1eabu \u0111en tr\u1eafng. H\u1ea7u h\u1ebft c\u00e1c camera \u0111i\u1ec7n tho\u1ea1i th\u00f4ng minh hi\u1ec7n \u0111\u1ea1i c\u00f3 th\u1ec3 x\u1eed l\u00fd vi\u1ec7c n\u00e0y m\u00e0 kh\u00f4ng c\u1ea7n b\u1ea5t k\u1ef3 \u1ee9ng d\u1ee5ng qu\u00e9t chuy\u00ean d\u1ee5ng n\u00e0o. N\u1ebfu b\u1ea1n mu\u1ed1n hi\u1ec3u \u0111\u1ea7y \u0111\u1ee7 c\u00e1c c\u00e1ch \u0111\u1ec3 k\u00edch ho\u1ea1t qu\u00e9t tr\u00ean c\u00e1c thi\u1ebft b\u1ecb kh\u00e1c nhau, th\u00ec <a href=\"https:\/\/pageloot.com\/vi\/how-to\/scan-qr-codes\/\">h\u01b0\u1edbng d\u1eabn qu\u00e9t m\u00e3 QR<\/a> bao g\u1ed3m quy tr\u00ecnh l\u00e0m vi\u1ec7c tr\u00ean iPhone, Android, m\u00e1y t\u00ednh b\u1ea3ng v\u00e0 m\u00e1y t\u00ednh \u0111\u1ec3 b\u00e0n m\u1ed9t c\u00e1ch chi ti\u1ebft.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc 2: Ph\u00e1t hi\u1ec7n m\u1eabu<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Ph\u1ea7n m\u1ec1m c\u1ee7a m\u00e1y qu\u00e9t s\u1eed d\u1ee5ng nh\u1eadn d\u1ea1ng m\u1eabu \u0111\u1ec3 \u0111\u1ecbnh v\u1ecb m\u00e3 QR trong h\u00ecnh \u1ea3nh. N\u00f3 t\u00ecm ki\u1ebfm ba m\u1eabu \u0111\u1ecbnh v\u1ecb \u1edf c\u00e1c g\u00f3c. Sau khi t\u00ecm th\u1ea5y, m\u00e1y qu\u00e9t x\u00e1c \u0111\u1ecbnh:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>M\u00e3 \u0111\u01b0\u1ee3c \u0111\u1ecbnh v\u1ecb \u1edf \u0111\u00e2u trong khung h\u00ecnh<\/li>\n<li>H\u01b0\u1edbng m\u00e0 n\u00f3 \u0111\u01b0\u1ee3c \u0111\u1ecbnh h\u01b0\u1edbng (ngay c\u1ea3 khi b\u1ecb xoay ho\u1eb7c h\u01a1i l\u1ec7ch)<\/li>\n<li>C\u00e1c c\u1ea1nh c\u1ee7a m\u00e3 \u1edf \u0111\u00e2u<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">B\u01b0\u1edbc n\u00e0y l\u00e0 l\u00fd do t\u1ea1i sao m\u00e3 QR v\u1eabn c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c \u1edf m\u1ed9t g\u00f3c \u2013 c\u00e1c m\u1eabu \u0111\u1ecbnh v\u1ecb cung c\u1ea5p cho thu\u1eadt to\u00e1n \u0111\u1ee7 h\u00ecnh h\u1ecdc \u0111\u1ec3 s\u1eeda l\u1ed7i bi\u1ebfn d\u1ea1ng.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc 3: L\u1ea5y m\u1eabu l\u01b0\u1edbi v\u00e0 Tr\u00edch xu\u1ea5t d\u1eef li\u1ec7u<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">V\u1edbi v\u1ecb tr\u00ed v\u00e0 h\u01b0\u1edbng c\u1ee7a m\u00e3 \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp, m\u00e1y qu\u00e9t \u0111\u1ecdc c\u00e1c m\u1eabu th\u1eddi gian v\u00e0 \u0111i\u1ec3m \u0111\u00e1nh d\u1ea5u c\u0103n ch\u1ec9nh \u0111\u1ec3 hi\u1ec3u c\u1ea5u tr\u00fac l\u01b0\u1edbi. Sau \u0111\u00f3, n\u00f3 l\u1ea5y m\u1eabu t\u1eebng m\u00f4-\u0111un theo m\u1ed9t \u0111\u01b0\u1eddng zigzag c\u1ee5 th\u1ec3 \u2013 t\u1eeb ph\u1ea3i sang tr\u00e1i, l\u00ean r\u1ed3i xu\u1ed1ng \u2013 b\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed9t v\u1ecb tr\u00ed \u0111\u00e3 bi\u1ebft v\u00e0 x\u1eed l\u00fd t\u1eebng m\u00f4-\u0111un d\u1eef li\u1ec7u cho \u0111\u1ebfn khi \u0111\u1ea1t \u0111\u1ebfn ch\u1ec9 b\u00e1o k\u1ebft th\u00fac.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Khi \u0111i theo \u0111\u01b0\u1eddng n\u00e0y, m\u00e1y qu\u00e9t \u0111\u1ecdc:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A <strong>ch\u1ec9 b\u00e1o ch\u1ebf \u0111\u1ed9<\/strong> (b\u1ed1n m\u00f4-\u0111un) ch\u1ec9 \u0111\u1ecbnh lo\u1ea1i m\u00e3 h\u00f3a \u2013 s\u1ed1, ch\u1eef v\u00e0 s\u1ed1, byte ho\u1eb7c Kanji<\/li>\n<li>A <strong>ch\u1ec9 b\u00e1o s\u1ed1 l\u01b0\u1ee3ng k\u00fd t\u1ef1<\/strong> cho bi\u1ebft c\u00f3 bao nhi\u00eau k\u00fd t\u1ef1 \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a<\/li>\n<li>C\u00e1c ph\u1ea7n c\u00f2n l\u1ea1i <strong>t\u1eeb m\u00e3 d\u1eef li\u1ec7u<\/strong> cho \u0111\u1ebfn cu\u1ed1i lu\u1ed3ng d\u1eef li\u1ec7u<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc 4: S\u1eeda l\u1ed7i<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sau khi \u0111\u1ecdc c\u00e1c m\u00f4-\u0111un d\u1eef li\u1ec7u, m\u00e1y qu\u00e9t x\u1eed l\u00fd c\u00e1c t\u1eeb m\u00e3 s\u1eeda l\u1ed7i. M\u00e3 QR s\u1eed d\u1ee5ng <strong>s\u1eeda l\u1ed7i Reed\u2013Solomon<\/strong>, nh\u00fang d\u1eef li\u1ec7u d\u1ef1 ph\u00f2ng cho ph\u00e9p n\u1ed9i dung g\u1ed1c \u0111\u01b0\u1ee3c t\u00e1i t\u1ea1o ngay c\u1ea3 khi m\u1ed9t ph\u1ea7n c\u1ee7a m\u00e3 b\u1ecb h\u01b0 h\u1ecfng v\u1eadt l\u00fd ho\u1eb7c b\u1ecb che khu\u1ea5t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00f3 b\u1ed1n c\u1ea5p \u0111\u1ed9 s\u1eeda l\u1ed7i ti\u00eau chu\u1ea9n h\u00f3a:<\/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<th>T\u1ed1t nh\u1ea5t \u0111\u1ec3 s\u1eed d\u1ee5ng cho<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>L (Th\u1ea5p)<\/td>\n<td>~7%<\/td>\n<td>M\u00f4i tr\u01b0\u1eddng trong nh\u00e0 s\u1ea1ch s\u1ebd<\/td>\n<\/tr>\n<tr>\n<td>M (Trung b\u00ecnh)<\/td>\n<td>~15%<\/td>\n<td>T\u00e0i li\u1ec7u ti\u1ebfp th\u1ecb chung<\/td>\n<\/tr>\n<tr>\n<td>Q (T\u1ee9 ph\u00e2n v\u1ecb)<\/td>\n<td>~25%<\/td>\n<td>S\u1eed d\u1ee5ng trong c\u00f4ng nghi\u1ec7p ho\u1eb7c ngo\u00e0i tr\u1eddi<\/td>\n<\/tr>\n<tr>\n<td>H (Cao)<\/td>\n<td>~30%<\/td>\n<td>M\u00e3 c\u00f3 logo, \u0111i\u1ec1u ki\u1ec7n kh\u1eafc nghi\u1ec7t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">S\u1eeda l\u1ed7i cao h\u01a1n c\u00f3 ngh\u0129a l\u00e0 m\u00e3 c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec1u h\u01b0 h\u1ecfng h\u01a1n nh\u01b0ng c\u0169ng y\u00eau c\u1ea7u nhi\u1ec1u m\u00f4-\u0111un h\u01a1n, l\u00e0m cho k\u00fd hi\u1ec7u t\u1ed5ng th\u1ec3 d\u00e0y \u0111\u1eb7c h\u01a1n. N\u1ebfu b\u1ea1n \u0111ang th\u00eam logo v\u00e0o m\u00e3 QR ho\u1eb7c \u0111\u1eb7t n\u00f3 \u1edf n\u01a1i ti\u1ebfp x\u00fac v\u1edbi th\u1eddi ti\u1ebft, ch\u1ecdn C\u1ea5p \u0111\u1ed9 H l\u00e0 l\u1ef1a ch\u1ecdn \u0111\u00fang \u0111\u1eafn. \u0110\u1ec3 t\u00ecm hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 c\u00e1ch s\u1ef1 \u0111\u00e1nh \u0111\u1ed5i n\u00e0y di\u1ec5n ra trong th\u1ef1c t\u1ebf, h\u00e3y xem b\u00e0i vi\u1ebft v\u1ec1 <a href=\"https:\/\/pageloot.com\/vi\/blog\/how-error-correction-works-in-editable-qr-codes\/\">c\u00e1ch s\u1eeda l\u1ed7i ho\u1ea1t \u0111\u1ed9ng trong m\u00e3 QR c\u00f3 th\u1ec3 ch\u1ec9nh s\u1eeda<\/a>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">B\u01b0\u1edbc 5: Gi\u1ea3i m\u00e3 th\u00e0nh n\u1ed9i dung d\u1ec5 \u0111\u1ecdc<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sau khi c\u00e1c bit d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c t\u00e1i t\u1ea1o, m\u00e1y qu\u00e9t gi\u1ea3i m\u00e3 chu\u1ed7i nh\u1ecb ph\u00e2n theo ch\u1ebf \u0111\u1ed9 m\u00e3 h\u00f3a c\u1ee7a m\u00e3 QR. C\u00e1c \u00f4 vu\u00f4ng m\u00e0u \u0111en tr\u1edf th\u00e0nh s\u1ed1 m\u1ed9t v\u00e0 c\u00e1c \u00f4 vu\u00f4ng m\u00e0u tr\u1eafng tr\u1edf th\u00e0nh s\u1ed1 kh\u00f4ng. Chu\u1ed7i nh\u1ecb ph\u00e2n \u0111\u00f3 sau \u0111\u00f3 \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ed5i th\u00e0nh n\u1ed9i dung d\u1ec5 \u0111\u1ecdc \u2013 m\u1ed9t URL, m\u1ed9t s\u1ed1 \u0111i\u1ec7n tho\u1ea1i, m\u1ed9t \u0111o\u1ea1n v\u0103n b\u1ea3n, th\u00f4ng tin li\u00ean h\u1ec7 ho\u1eb7c b\u1ea5t k\u1ef3 lo\u1ea1i d\u1eef li\u1ec7u n\u00e0o kh\u00e1c m\u00e0 m\u00e3 ban \u0111\u1ea7u \u0111\u01b0\u1ee3c t\u1ea1o ra \u0111\u1ec3 ch\u1ee9a.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu m\u00e3 ch\u1ee9a m\u1ed9t URL, thi\u1ebft b\u1ecb c\u1ee7a b\u1ea1n s\u1ebd hi\u1ec3n th\u1ecb l\u1eddi nh\u1eafc \u0111\u1ec3 m\u1edf n\u00f3. \u0110\u00f3 l\u00e0 th\u1eddi \u0111i\u1ec3m qu\u00e1 tr\u00ecnh qu\u00e9t chuy\u1ec3n giao cho tr\u00ecnh duy\u1ec7t ho\u1eb7c \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n.<\/p>\n\n\n\n<blockquote class=\"is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>H\u00e3y th\u1eed M\u00e1y qu\u00e9t m\u00e3 QR mi\u1ec5n ph\u00ed c\u1ee7a Pageloot<\/strong> C\u1ea7n gi\u1ea3i m\u00e3 m\u00e3 QR tr\u1ef1c ti\u1ebfp t\u1eeb h\u00ecnh \u1ea3nh ho\u1eb7c webcam c\u1ee7a b\u1ea1n? C\u00f4ng c\u1ee5 n\u00e0y <a href=\"https:\/\/pageloot.com\/vi\/qr-code-scanner\/\">M\u00e1y qu\u00e9t m\u00e3 QR Pageloot<\/a> ho\u1ea1t \u0111\u1ed9ng tr\u00ean m\u1ecdi tr\u00ecnh duy\u1ec7t hi\u1ec7n \u0111\u1ea1i \u2013 kh\u00f4ng c\u1ea7n t\u1ea3i xu\u1ed1ng \u1ee9ng d\u1ee5ng.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">M\u00e1y qu\u00e9t QR kh\u00e1c v\u1edbi M\u00e1y qu\u00e9t m\u00e3 v\u1ea1ch nh\u01b0 th\u1ebf n\u00e0o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Nguy\u00ean l\u00fd v\u1eadt l\u00fd c\u01a1 b\u1ea3n t\u01b0\u01a1ng t\u1ef1: c\u1ea3 hai lo\u1ea1i m\u00e1y qu\u00e9t \u0111\u1ec1u chi\u1ebfu s\u00e1ng m\u1ed9t m\u1eabu, ph\u00e1t hi\u1ec7n \u00e1nh s\u00e1ng ph\u1ea3n x\u1ea1 v\u00e0 gi\u1ea3i m\u00e3 k\u1ebft qu\u1ea3. Nh\u01b0ng m\u00e1y qu\u00e9t m\u00e3 v\u1ea1ch laser ti\u00eau chu\u1ea9n \u0111\u1ecdc theo m\u1ed9t \u0111\u01b0\u1eddng ngang duy nh\u1ea5t, \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao n\u00f3 ch\u1ec9 c\u00f3 th\u1ec3 x\u1eed l\u00fd m\u00e3 v\u1ea1ch 1D. \u0110\u1ecdc m\u00e3 QR 2D y\u00eau c\u1ea7u m\u1ed9t c\u1ea3m bi\u1ebfn d\u1ef1a tr\u00ean h\u00ecnh \u1ea3nh \u0111\u1ec3 ch\u1ee5p to\u00e0n b\u1ed9 m\u1eabu c\u00f9ng m\u1ed9t l\u00fac.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 so s\u00e1nh tr\u1ef1c ti\u1ebfp v\u1ec1 c\u00e1ch hai \u0111\u1ecbnh d\u1ea1ng n\u00e0y kh\u00e1c nhau v\u1ec1 kh\u1ea3 n\u0103ng v\u00e0 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng, b\u00e0i vi\u1ebft <a href=\"https:\/\/pageloot.com\/vi\/barcode\/how-barcode-scanner-works\/\">gi\u1ea3i th\u00edch v\u1ec1 m\u00e1y qu\u00e9t m\u00e3 v\u1ea1ch<\/a> bao g\u1ed3m chi ti\u1ebft c\u00e1c th\u00e0nh ph\u1ea7n h\u1ec7 th\u1ed1ng chi\u1ebfu s\u00e1ng, c\u1ea3m bi\u1ebfn v\u00e0 b\u1ed9 gi\u1ea3i m\u00e3 \u2013 v\u00e0 b\u00e0i vi\u1ebft <a href=\"https:\/\/pageloot.com\/vi\/barcode\/barcode-vs-qr-code\/\">so s\u00e1nh m\u00e3 v\u1ea1ch v\u00e0 m\u00e3 QR<\/a> ph\u00e2n t\u00edch \u0111\u1ecbnh d\u1ea1ng n\u00e0o ph\u00f9 h\u1ee3p h\u01a1n cho c\u00e1c \u1ee9ng d\u1ee5ng kinh doanh kh\u00e1c nhau.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0110i\u1ec1u g\u00ec l\u00e0m cho m\u00e3 QR d\u1ec5 (ho\u1eb7c kh\u00f3) qu\u00e9t<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Hi\u1ec3u qu\u00e1 tr\u00ecnh qu\u00e9t cho th\u1ea5y t\u1ea1i sao m\u1ed9t s\u1ed1 l\u1ef1a ch\u1ecdn thi\u1ebft k\u1ebf l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng \u0111\u1ecdc:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u0110\u1ed9 t\u01b0\u01a1ng ph\u1ea3n th\u1ea5p<\/strong> \u2013 m\u00e1y qu\u00e9t ph\u00e2n bi\u1ec7t c\u00e1c m\u00f4-\u0111un b\u1eb1ng s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng gi\u1eefa c\u00e1c v\u00f9ng \u0111en v\u00e0 tr\u1eafng; m\u1ed9t m\u00e3 \u0111\u01b0\u1ee3c in m\u00e0u x\u00e1m tr\u00ean n\u1ec1n nh\u1ea1t s\u1ebd kh\u00f4ng v\u01b0\u1ee3t qua \u0111\u01b0\u1ee3c th\u1eed nghi\u1ec7m n\u00e0y<\/li>\n<li><strong>Thi\u1ebfu v\u00f9ng y\u00ean t\u0129nh<\/strong> \u2013 n\u1ebfu kh\u00f4ng c\u00f3 l\u1ec1 tr\u1eafng r\u00f5 r\u00e0ng, m\u00e1y qu\u00e9t kh\u00f4ng th\u1ec3 \u0111\u1ecbnh v\u1ecb ch\u00ednh x\u00e1c c\u00e1c c\u1ea1nh c\u1ee7a m\u00e3, \u0111\u1eb7c bi\u1ec7t n\u1ebfu v\u0103n b\u1ea3n ho\u1eb7c \u0111\u1ed3 h\u1ecda xung quanh \u1edf g\u1ea7n<\/li>\n<li><strong>Qu\u00e1 nh\u1ecf so v\u1edbi kho\u1ea3ng c\u00e1ch xem<\/strong> \u2013 \u00e1p d\u1ee5ng quy t\u1eafc 10:1: c\u1ee9 m\u1ed7i 10 cm kho\u1ea3ng c\u00e1ch qu\u00e9t, m\u00e3 ph\u1ea3i r\u1ed9ng \u00edt nh\u1ea5t 1 cm; m\u1ee9c t\u1ed1i thi\u1ec3u th\u1ef1c t\u1ebf \u0111\u1ec3 s\u1eed d\u1ee5ng in \u1edf c\u1ef1 ly g\u1ea7n l\u00e0 2\u00d72 cm<\/li>\n<li><strong>M\u00e0u s\u1eafc \u0111\u1ea3o ng\u01b0\u1ee3c ho\u1eb7c kh\u00f4ng theo quy \u01b0\u1edbc<\/strong> \u2013 c\u00e1c m\u00f4-\u0111un s\u00e1ng tr\u00ean n\u1ec1n t\u1ed1i c\u00f3 th\u1ec3 g\u00e2y nh\u1ea7m l\u1eabn cho vi\u1ec7c nh\u1eadn d\u1ea1ng m\u1eabu \u1edf m\u1ed9t s\u1ed1 m\u00e1y qu\u00e9t<\/li>\n<li><strong>\u0110\u1ea7u ra m\u1edd ho\u1eb7c b\u1ecb v\u1ee1 h\u1ea1t<\/strong> \u2013 h\u00ecnh \u1ea3nh raster \u0111\u1ed9 ph\u00e2n gi\u1ea3i th\u1ea5p s\u1ebd b\u1ecb v\u1ee1 khi in \u1edf t\u1ef7 l\u1ec7 l\u1edbn; c\u00e1c \u0111\u1ecbnh d\u1ea1ng vector nh\u01b0 SVG ho\u1eb7c EPS v\u1eabn s\u1eafc n\u00e9t \u1edf m\u1ecdi k\u00edch th\u01b0\u1edbc<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ec3 \u0111\u01b0\u1ee3c h\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n v\u1ec1 k\u00edch th\u01b0\u1edbc, \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n, v\u1ecb tr\u00ed v\u00e0 th\u1eed nghi\u1ec7m, b\u00e0i vi\u1ebft v\u1ec1 <a href=\"https:\/\/pageloot.com\/vi\/blog\/best-practices-for-qr-code-readability\/\">c\u00e1c ph\u01b0\u01a1ng ph\u00e1p hay nh\u1ea5t v\u1ec1 kh\u1ea3 n\u0103ng \u0111\u1ecdc m\u00e3 QR<\/a> \u0111\u1ec1 c\u1eadp \u0111\u1ebfn t\u1eebng y\u1ebfu t\u1ed1 v\u1edbi c\u00e1c khuy\u1ebfn ngh\u1ecb c\u1ee5 th\u1ec3.<\/p>\n\n\n\n<figure><img decoding=\"async\" src=\"https:\/\/pageloot.com\/wp-content\/uploads\/2026\/05\/qr-code-readability-79be55-69a8722887c7.webp\" alt=\"Kh\u1ea3 n\u0103ng \u0111\u1ecdc m\u00e3 QR\" \/><\/figure>\n\n\n\n<blockquote class=\"is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>T\u1ea1o m\u00e3 \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng \u0111\u1ec3 qu\u00e9t<\/strong> C\u00e1c <a href=\"https:\/\/pageloot.com\/vi\/qr-code-generator\/\">tr\u00ecnh t\u1ea1o m\u00e3 QR Pageloot<\/a> cho ph\u00e9p b\u1ea1n x\u00e2y d\u1ef1ng, t\u00f9y ch\u1ec9nh v\u00e0 ki\u1ec3m tra m\u00e3 QR v\u1edbi kh\u1ea3 n\u0103ng s\u1eeda l\u1ed7i, \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n v\u00e0 \u0111\u1ecbnh d\u1ea1ng ph\u00f9 h\u1ee3p cho tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng c\u1ee5 th\u1ec3 c\u1ee7a b\u1ea1n \u2013 v\u00e0 m\u00e3 \u0111\u1ed9ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt sau khi in m\u00e0 kh\u00f4ng c\u1ea7n t\u1ea1o h\u00ecnh \u1ea3nh m\u1edbi.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">M\u00e3 QR t\u0129nh so v\u1edbi m\u00e3 QR \u0111\u1ed9ng: M\u00e1y qu\u00e9t nh\u00ecn th\u1ea5y g\u00ec<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">T\u1eeb g\u00f3c \u0111\u1ed9 c\u1ee7a m\u00e1y qu\u00e9t, m\u1ecdi m\u00e3 QR \u0111\u1ec1u tr\u00f4ng gi\u1ed1ng nhau: m\u1ed9t ma tr\u1eadn c\u00e1c m\u00f4-\u0111un m\u00e3 h\u00f3a m\u1ed9t chu\u1ed7i d\u1eef li\u1ec7u. S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa m\u00e3 t\u0129nh v\u00e0 m\u00e3 \u0111\u1ed9ng n\u1eb1m \u1edf n\u1ed9i dung d\u1eef li\u1ec7u \u0111\u00f3.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>m\u00e3 QR t\u0129nh<\/strong> m\u00e3 h\u00f3a tr\u1ef1c ti\u1ebfp \u0111\u00edch \u0111\u1ebfn cu\u1ed1i c\u00f9ng \u2013 URL \u0111\u1ea7y \u0111\u1ee7, v\u0103n b\u1ea3n ho\u1eb7c th\u00f4ng tin li\u00ean h\u1ec7 \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p v\u00e0o c\u00e1c m\u00f4-\u0111un t\u1ea1i th\u1eddi \u0111i\u1ec3m t\u1ea1o. Thay \u0111\u1ed5i n\u1ed9i dung c\u00f3 ngh\u0129a l\u00e0 t\u1ea1o m\u1ed9t m\u00e3 m\u1edbi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A <strong>m\u00e3 QR \u0111\u1ed9ng<\/strong> m\u00e3 h\u00f3a m\u1ed9t URL chuy\u1ec3n h\u01b0\u1edbng ng\u1eafn tr\u1ecf \u0111\u1ebfn m\u1ed9t m\u00e1y ch\u1ee7. Khi \u0111\u01b0\u1ee3c qu\u00e9t, chuy\u1ec3n h\u01b0\u1edbng \u0111\u00f3 s\u1ebd chuy\u1ec3n ng\u01b0\u1eddi d\u00f9ng \u0111\u1ebfn b\u1ea5t k\u1ef3 \u0111\u00edch \u0111\u1ebfn n\u00e0o m\u00e0 ch\u1ee7 s\u1edf h\u1eefu m\u00e3 \u0111\u00e3 \u0111\u1eb7t. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 m\u00e3 v\u1eadt l\u00fd kh\u00f4ng bao gi\u1edd thay \u0111\u1ed5i, nh\u01b0ng h\u00e0nh vi c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt ngay l\u1eadp t\u1ee9c. M\u00e3 \u0111\u1ed9ng c\u0169ng cho ph\u00e9p theo d\u00f5i l\u01b0\u1ee3t qu\u00e9t \u2013 m\u1ed7i l\u01b0\u1ee3t qu\u00e9t ghi l\u1ea1i m\u1ed9t \u0111i\u1ec3m d\u1eef li\u1ec7u cho bi\u1ebft khi n\u00e0o v\u00e0 \u1edf \u0111\u00e2u m\u00e3 \u0111\u01b0\u1ee3c qu\u00e9t, tr\u00ean thi\u1ebft b\u1ecb n\u00e0o v\u00e0 t\u1ea7n su\u1ea5t qu\u00e9t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu m\u1ed9t chi\u1ebfn d\u1ecbch m\u00e3 QR c\u1ea7n c\u00f3 th\u1ec3 \u0111o l\u01b0\u1eddng \u0111\u01b0\u1ee3c ho\u1eb7c n\u1ed9i dung \u0111\u01b0\u1ee3c li\u00ean k\u1ebft c\u00f3 th\u1ec3 thay \u0111\u1ed5i, m\u00e3 \u0111\u1ed9ng l\u00e0 l\u1ef1a ch\u1ecdn th\u1ef1c t\u1ebf. \u0110\u1ed1i v\u1edbi c\u00e1c doanh nghi\u1ec7p so s\u00e1nh to\u00e0n b\u1ed9 c\u00e1c t\u00f9y ch\u1ecdn \u1ee9ng d\u1ee5ng m\u00e1y qu\u00e9t v\u00e0 nh\u1eefng g\u00ec c\u1ea7n t\u00ecm \u1edf m\u1ed9t c\u00f4ng c\u1ee5 qu\u00e9t, th\u00ec <a href=\"https:\/\/pageloot.com\/vi\/blog\/best-qr-code-scanning-apps-comparison\/\">So s\u00e1nh c\u00e1c \u1ee9ng d\u1ee5ng qu\u00e9t m\u00e3 QR<\/a> bao g\u1ed3m c\u00e1c l\u1ef1a ch\u1ecdn ch\u00ednh.<\/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-4fd634767d09\"><strong class=\"schema-faq-question\">T\u00f4i c\u00f3 c\u1ea7n m\u1ed9t \u1ee9ng d\u1ee5ng \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 qu\u00e9t m\u00e3 QR kh\u00f4ng?<\/strong> <p class=\"schema-faq-answer\">Kh\u00f4ng. H\u1ea7u h\u1ebft c\u00e1c \u0111i\u1ec7n tho\u1ea1i th\u00f4ng minh ch\u1ea1y iOS 11 tr\u1edf l\u00ean v\u00e0 c\u00e1c thi\u1ebft b\u1ecb Android hi\u1ec7n \u0111\u1ea1i c\u00f3 th\u1ec3 qu\u00e9t m\u00e3 QR tr\u1ef1c ti\u1ebfp th\u00f4ng qua \u1ee9ng d\u1ee5ng camera g\u1ed1c. \u0110\u1ec3 ki\u1ec3m so\u00e1t nhi\u1ec1u h\u01a1n \u2013 ch\u1eb3ng h\u1ea1n nh\u01b0 qu\u00e9t t\u1eeb m\u1ed9t h\u00ecnh \u1ea3nh \u0111\u00e3 l\u01b0u ho\u1eb7c ki\u1ec3m tra l\u1ecbch s\u1eed qu\u00e9t \u2013 m\u1ed9t c\u00f4ng c\u1ee5 chuy\u00ean d\u1ee5ng nh\u01b0 m\u00e1y qu\u00e9t QR Pageloot ho\u1ea1t \u0111\u1ed9ng t\u1eeb b\u1ea5t k\u1ef3 tr\u00ecnh duy\u1ec7t n\u00e0o m\u00e0 kh\u00f4ng c\u1ea7n c\u00e0i \u0111\u1eb7t.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-fbb973c357f9\"><strong class=\"schema-faq-question\">T\u1ea1i sao m\u00e3 QR c\u1ee7a t\u00f4i qu\u00e9t \u0111\u01b0\u1ee3c tr\u00ean m\u1ed9t s\u1ed1 thi\u1ebft b\u1ecb nh\u01b0ng kh\u00f4ng qu\u00e9t \u0111\u01b0\u1ee3c tr\u00ean nh\u1eefng thi\u1ebft b\u1ecb kh\u00e1c?<\/strong> <p class=\"schema-faq-answer\">C\u00e1c nguy\u00ean nh\u00e2n ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n th\u1ea5p, thi\u1ebfu v\u00f9ng y\u00ean t\u0129nh, m\u00e3 qu\u00e1 nh\u1ecf so v\u1edbi kho\u1ea3ng c\u00e1ch xem, ho\u1eb7c h\u00ecnh \u1ea3nh qu\u00e1 m\u1edd \u0111\u1ec3 ph\u00e2n gi\u1ea3i c\u00e1c m\u00f4-\u0111un. C\u00e1c thi\u1ebft b\u1ecb c\u0169 h\u01a1n v\u1edbi camera \u0111\u1ed9 ph\u00e2n gi\u1ea3i th\u1ea5p h\u01a1n nh\u1ea1y c\u1ea3m h\u01a1n v\u1edbi nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y. Vi\u1ec7c ki\u1ec3m tra tr\u00ean nhi\u1ec1u thi\u1ebft b\u1ecb tr\u01b0\u1edbc khi in v\u00e0 s\u1eed d\u1ee5ng c\u00e1c m\u1ee9c s\u1eeda l\u1ed7i cao h\u01a1n (Q ho\u1eb7c H) s\u1ebd gi\u1ea3m kh\u1ea3 n\u0103ng th\u1ea5t b\u1ea1i. Xem danh s\u00e1ch \u0111\u1ea7y \u0111\u1ee7 c\u00e1c nguy\u00ean nh\u00e2n v\u00e0 c\u00e1ch kh\u1eafc ph\u1ee5c trong h\u01b0\u1edbng d\u1eabn m\u00e3 QR kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-41e484ee4c97\"><strong class=\"schema-faq-question\">M\u00e3 QR c\u00f3 th\u1ec3 ch\u1ee9a bao nhi\u00eau d\u1eef li\u1ec7u?<\/strong> <p class=\"schema-faq-answer\">M\u1ed9t m\u00e3 QR Phi\u00ean b\u1ea3n 40 \u1edf m\u1ee9c s\u1eeda l\u1ed7i th\u1ea5p nh\u1ea5t c\u00f3 th\u1ec3 m\u00e3 h\u00f3a t\u1edbi 7.089 k\u00fd t\u1ef1 s\u1ed1, 4.296 k\u00fd t\u1ef1 ch\u1eef v\u00e0 s\u1ed1, ho\u1eb7c 2.953 byte d\u1eef li\u1ec7u nh\u1ecb ph\u00e2n. Trong th\u1ef1c t\u1ebf, c\u00e1c URL ng\u1eafn h\u01a1n v\u00e0 n\u1ed9i dung \u0111\u01a1n gi\u1ea3n h\u01a1n t\u1ea1o ra c\u00e1c m\u00e3 \u00edt d\u00e0y \u0111\u1eb7c h\u01a1n, qu\u00e9t nhanh h\u01a1n v\u00e0 \u0111\u00e1ng tin c\u1eady h\u01a1n. To\u00e0n b\u1ed9 ph\u00e2n t\u00edch chi ti\u1ebft v\u1ec1 phi\u00ean b\u1ea3n, dung l\u01b0\u1ee3ng v\u00e0 c\u00e1c \u0111\u00e1nh \u0111\u1ed5i v\u1ec1 s\u1eeda l\u1ed7i \u0111\u01b0\u1ee3c \u0111\u1ec1 c\u1eadp trong h\u01b0\u1edbng d\u1eabn gi\u1edbi h\u1ea1n d\u1eef li\u1ec7u m\u00e3 QR.<\/p> <\/div> <\/div>","protected":false},"excerpt":{"rendered":"<p>T\u00ecm hi\u1ec3u c\u00e1ch m\u00e1y qu\u00e9t m\u00e3 QR ho\u1ea1t \u0111\u1ed9ng th\u00f4ng qua vi\u1ec7c ch\u1ee5p \u1ea3nh, ph\u00e1t hi\u1ec7n m\u1eabu v\u00e0 s\u1eeda l\u1ed7i \u0111\u1ec3 gi\u1ea3i m\u00e3 c\u00e1c m\u00f4-\u0111un \u0111en tr\u1eafng th\u00e0nh d\u1eef li\u1ec7u m\u00e0 con ng\u01b0\u1eddi c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c.<\/p>","protected":false},"author":17,"featured_media":54315,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[6],"tags":[],"class_list":["post-2119","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 v28.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Best Open QR Code Scanner Pro Online<\/title>\n<meta name=\"description\" content=\"Pageloot is a fast &amp; open QR code scanner software online to interpret a wide range of QR &amp; barcodes at no cost. Scan your Codes Now!\" \/>\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\/qr-code-scanner-works\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How Does a QR Code Scanner Work?\" \/>\n<meta property=\"og:description\" content=\"Pageloot is a fast &amp; open QR code scanner software online to interpret a wide range of QR &amp; barcodes at no cost. Scan your Codes Now!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/pageloot.com\/vi\/how-to\/qr-code-scanner-works\/\" \/>\n<meta property=\"og:site_name\" content=\"Pageloot\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/pageloot\/\" \/>\n<meta property=\"article:published_time\" content=\"2019-04-30T23:35:54+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-06-10T08:17:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/pageloot.com\/wp-content\/uploads\/2019\/04\/how-to-use-a-qr-code-scanner.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1600\" \/>\n\t<meta property=\"og:image:height\" content=\"1143\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Siim T\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@getpageloot\" \/>\n<meta name=\"twitter:site\" content=\"@getpageloot\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Siim T\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 ph\u00fat\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/pageloot.com\\\/how-to\\\/qr-code-scanner-works\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pageloot.com\\\/how-to\\\/qr-code-scanner-works\\\/\"},\"author\":{\"name\":\"Siim T\",\"@id\":\"https:\\\/\\\/pageloot.com\\\/es\\\/#\\\/schema\\\/person\\\/fa28992c2e52546f0812833bac852dfe\"},\"headline\":\"How Does a QR Code Scanner Work?\",\"datePublished\":\"2019-04-30T23:35:54+00:00\",\"dateModified\":\"2026-06-10T08:17:15+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/pageloot.com\\\/how-to\\\/qr-code-scanner-works\\\/\"},\"wordCount\":1600,\"publisher\":{\"@id\":\"https:\\\/\\\/pageloot.com\\\/es\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/pageloot.com\\\/how-to\\\/qr-code-scanner-works\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pageloot.com\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/modern-cafe-qr-e89b17-024b8efc184a.webp\",\"articleSection\":[\"Guides\"],\"inLanguage\":\"vi\"},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/pageloot.com\\\/how-to\\\/qr-code-scanner-works\\\/\",\"url\":\"https:\\\/\\\/pageloot.com\\\/how-to\\\/qr-code-scanner-works\\\/\",\"name\":\"Best Open QR Code Scanner Pro Online\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pageloot.com\\\/es\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/pageloot.com\\\/how-to\\\/qr-code-scanner-works\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/pageloot.com\\\/how-to\\\/qr-code-scanner-works\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pageloot.com\\\/wp-content\\\/uploads\\\/2026\\\/05\\\/modern-cafe-qr-e89b17-024b8efc184a.webp\",\"datePublished\":\"2019-04-30T23:35:54+00:00\",\"dateModified\":\"2026-06-10T08:17:15+00:00\",\"description\":\"Pageloot is a fast & open QR code scanner software online to interpret a wide range of QR & barcodes at no cost. 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V\u1edbi chuy\u00ean m\u00f4n s\u00e2u s\u1eafc k\u00e9o d\u00e0i h\u01a1n 5 n\u0103m ch\u1ec9 v\u1ec1 m\u00e3 QR, Siim \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t chuy\u00ean gia v\u1ec1 ch\u1ee7 \u0111\u1ec1 n\u00e0y trong l\u0129nh v\u1ef1c n\u00e0y. Anh \u1ea5y \u0111\u00e3 c\u00f3 nh\u1eefng b\u01b0\u1edbc ti\u1ebfn \u0111\u00e1ng k\u1ec3 trong vi\u1ec7c t\u1eadn d\u1ee5ng c\u00f4ng ngh\u1ec7 QR \u0111\u1ec3 \u0111\u01a1n gi\u1ea3n h\u00f3a v\u00e0 t\u0103ng c\u01b0\u1eddng c\u00e1c t\u01b0\u01a1ng t\u00e1c k\u1ef9 thu\u1eadt s\u1ed1. Cu\u1ed9c h\u00e0nh tr\u00ecnh c\u1ee7a anh kh\u00f4ng ch\u1ec9 b\u1eaft \u0111\u1ea7u \u1edf \u0111\u00e2y. 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\/how-to\/qr-code-scanner-works\/#faq-question-4fd634767d09","position":1,"url":"https:\/\/pageloot.com\/how-to\/qr-code-scanner-works\/#faq-question-4fd634767d09","name":"T\u00f4i c\u00f3 c\u1ea7n m\u1ed9t \u1ee9ng d\u1ee5ng \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 qu\u00e9t m\u00e3 QR kh\u00f4ng?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"No. Most smartphones running iOS 11 or later and modern Android devices can scan QR codes directly through the native camera app. For more control \u2013 such as scanning from a saved image or checking scan history \u2013 a dedicated tool like the Pageloot QR scanner works from any browser without installation.","inLanguage":"vi"},"inLanguage":"vi"},{"@type":"Question","@id":"https:\/\/pageloot.com\/how-to\/qr-code-scanner-works\/#faq-question-fbb973c357f9","position":2,"url":"https:\/\/pageloot.com\/how-to\/qr-code-scanner-works\/#faq-question-fbb973c357f9","name":"T\u1ea1i sao m\u00e3 QR c\u1ee7a t\u00f4i qu\u00e9t \u0111\u01b0\u1ee3c tr\u00ean m\u1ed9t s\u1ed1 thi\u1ebft b\u1ecb nh\u01b0ng kh\u00f4ng qu\u00e9t \u0111\u01b0\u1ee3c tr\u00ean nh\u1eefng thi\u1ebft b\u1ecb kh\u00e1c?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The most common causes are low contrast, a missing quiet zone, a code that's too small for the viewing distance, or an image that's too blurry to resolve the modules. Older devices with lower-resolution cameras are more sensitive to these issues. Testing across multiple devices before printing, and using higher error correction levels (Q or H), reduces the chance of failures. See the full list of causes and fixes in the QR code not working guide.","inLanguage":"vi"},"inLanguage":"vi"},{"@type":"Question","@id":"https:\/\/pageloot.com\/how-to\/qr-code-scanner-works\/#faq-question-41e484ee4c97","position":3,"url":"https:\/\/pageloot.com\/how-to\/qr-code-scanner-works\/#faq-question-41e484ee4c97","name":"M\u00e3 QR c\u00f3 th\u1ec3 ch\u1ee9a bao nhi\u00eau d\u1eef li\u1ec7u?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A Version 40 QR code at the lowest error correction level can encode up to 7,089 numeric characters, 4,296 alphanumeric characters, or 2,953 bytes of binary data. In practice, shorter URLs and simpler content produce less dense codes that scan faster and more reliably. The full breakdown of version, capacity, and error correction trade-offs is covered in the QR code data limits guide.","inLanguage":"vi"},"inLanguage":"vi"}]}},"_links":{"self":[{"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/posts\/2119","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=2119"}],"version-history":[{"count":2,"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/posts\/2119\/revisions"}],"predecessor-version":[{"id":54924,"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/posts\/2119\/revisions\/54924"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/media\/54315"}],"wp:attachment":[{"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/media?parent=2119"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/categories?post=2119"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pageloot.com\/vi\/wp-json\/wp\/v2\/tags?post=2119"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}