{"id":11444,"date":"2026-01-10T14:22:17","date_gmt":"2026-01-10T06:22:17","guid":{"rendered":"https:\/\/blog.visual-paradigm.com\/vn\/how-to-unlock-pdf-online\/"},"modified":"2026-01-10T14:22:17","modified_gmt":"2026-01-10T06:22:17","slug":"how-to-unlock-pdf-online","status":"publish","type":"post","link":"https:\/\/blog.visual-paradigm.com\/vn\/how-to-unlock-pdf-online\/","title":{"rendered":"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 m\u1edf kh\u00f3a PDF tr\u1ef1c tuy\u1ebfn"},"content":{"rendered":"<p><img alt=\"\" class=\"alignnone wp-image-13228 size-full\" decoding=\"async\" height=\"246\" loading=\"lazy\" sizes=\"auto, (max-width: 506px) 100vw, 506px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/pdf-protected.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/pdf-protected.png 506w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/pdf-protected-300x146.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/pdf-protected-150x73.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/pdf-protected-400x194.png 400w\" width=\"506\"\/><\/p>\n<p>B\u1ea3o v\u1ec7 th\u00f4ng tin nh\u1ea1y c\u1ea3m c\u1ee7a b\u1ea1n b\u1eb1ng c\u00e1ch kh\u00f3a m\u1ed9t s\u1ed1 t\u1ec7p PDF. \u0110i\u1ec1u n\u00e0y s\u1ebd h\u1ea1n ch\u1ebf c\u00e1c thao t\u00e1c nh\u01b0 in \u1ea5n ho\u1eb7c ch\u1ec9nh s\u1eeda. V\u00ed d\u1ee5, c\u00e1c b\u00e1o c\u00e1o ng\u00e2n h\u00e0ng, h\u00f3a \u0111\u01a1n ho\u1eb7c h\u00f3a \u0111\u01a1n \u0111i\u1ec7n tho\u1ea1i ch\u1ee9a d\u1eef li\u1ec7u b\u00ed m\u1eadt n\u00ean \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 t\u1ed1t nh\u1ea5t b\u1eb1ng m\u1eadt kh\u1ea9u. Sau khi nh\u1eadp m\u1eadt kh\u1ea9u, ng\u01b0\u1eddi nh\u1eadn c\u00f3 th\u1ec3 truy c\u1eadp d\u1eef li\u1ec7u v\u00e0 th\u1ef1c hi\u1ec7n b\u1ea5t k\u1ef3 thay \u0111\u1ed5i n\u00e0o \u0111\u1ed1i v\u1edbi t\u1ec7p PDF.<\/p>\n<h2>T\u1ec7p PDF l\u00e0 g\u00ec v\u00e0 n\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u00e0m g\u00ec?<\/h2>\n<p>PDF, hay c\u00f2n g\u1ecdi l\u00e0 \u0110\u1ecbnh d\u1ea1ng T\u00e0i li\u1ec7u Di \u0111\u1ed9ng, l\u00e0 m\u1ed9t \u0111\u1ecbnh d\u1ea1ng t\u1ec7p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3<strong>tr\u00ecnh b\u00e0y t\u00e0i li\u1ec7u theo c\u00e1ch \u0111\u1ed9c l\u1eadp v\u1edbi ph\u1ea7n m\u1ec1m, ph\u1ea7n c\u1ee9ng,<\/strong>v\u00e0 h\u1ec7 \u0111i\u1ec1u h\u00e0nh. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 t\u1ec7p PDF s\u1ebd tr\u00f4ng gi\u1ed1ng nhau tr\u00ean b\u1ea5t k\u1ef3 thi\u1ebft b\u1ecb v\u00e0 h\u1ec7 \u0111i\u1ec1u h\u00e0nh n\u00e0o m\u00e0 n\u00f3 \u0111\u01b0\u1ee3c m\u1edf, khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn ph\u1ed5 bi\u1ebfn \u0111\u1ec3 chia s\u1ebb t\u00e0i li\u1ec7u.<\/p>\n<h2>M\u1ee5c \u0111\u00edch c\u1ee7a b\u1ea3o v\u1ec7 m\u1eadt kh\u1ea9u t\u1ec7p PDF<\/h2>\n<p>M\u1ee5c \u0111\u00edch c\u1ee7a b\u1ea3o v\u1ec7 m\u1eadt kh\u1ea9u t\u1ec7p PDF l\u00e0<strong>cung c\u1ea5p th\u00eam m\u1ed9t l\u1edbp b\u1ea3o m\u1eadt cho th\u00f4ng tin nh\u1ea1y c\u1ea3m<\/strong>\u0111\u01b0\u1ee3c ch\u1ee9a trong t\u00e0i li\u1ec7u PDF. V\u1edbi t\u1ec7p PDF \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 b\u1eb1ng m\u1eadt kh\u1ea9u, ch\u1ec9 nh\u1eefng ng\u01b0\u1eddi c\u00f3 m\u1eadt kh\u1ea9u m\u1edbi c\u00f3 th\u1ec3 truy c\u1eadp n\u1ed9i dung c\u1ee7a t\u00e0i li\u1ec7u. \u0110i\u1ec1u n\u00e0y r\u1ea5t h\u1eefu \u00edch cho c\u00e1c t\u00e0i li\u1ec7u m\u1eadt c\u1ea7n \u0111\u01b0\u1ee3c chia s\u1ebb nh\u01b0ng ph\u1ea3i \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 kh\u1ecfi truy c\u1eadp tr\u00e1i ph\u00e9p.<\/p>\n<h2>Nhu c\u1ea7u m\u1edf kh\u00f3a t\u1ec7p PDF<\/h2>\n<p>Tuy nhi\u00ean, c\u00f3 th\u1ec3 c\u00f3 nh\u1eefng l\u00fac b\u1ea1n c\u1ea7n m\u1edf kh\u00f3a t\u1ec7p PDF \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 b\u1eb1ng m\u1eadt kh\u1ea9u, v\u00ed d\u1ee5 nh\u01b0 khi b\u1ea1n \u0111\u00e3<strong>qu\u00ean m\u1eadt kh\u1ea9u<\/strong>ho\u1eb7c n\u1ebfu b\u1ea1n nh\u1eadn \u0111\u01b0\u1ee3c m\u1ed9t t\u1ec7p PDF t\u1eeb ng\u01b0\u1eddi kh\u00e1c m\u00e0 \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 b\u1eb1ng m\u1eadt kh\u1ea9u. Trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p nh\u01b0 v\u1eady, b\u1ea1n c\u00f3 th\u1ec3 c\u1ea7n s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 m\u1edf kh\u00f3a PDF \u0111\u1ec3 g\u1ee1 b\u1ecf b\u1ea3o v\u1ec7 m\u1eadt kh\u1ea9u v\u00e0 truy c\u1eadp n\u1ed9i dung c\u1ee7a t\u00e0i li\u1ec7u.<\/p>\n<p>T\u00f3m l\u1ea1i, PDF l\u00e0 \u0111\u1ecbnh d\u1ea1ng t\u1ec7p ph\u1ed5 bi\u1ebfn \u0111\u1ec3 chia s\u1ebb t\u00e0i li\u1ec7u v\u00e0 b\u1ea3o v\u1ec7 m\u1eadt kh\u1ea9u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u1ea3o v\u1ec7 th\u00f4ng tin nh\u1ea1y c\u1ea3m. Khi c\u1ea7n thi\u1ebft, c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00f4ng c\u1ee5 m\u1edf kh\u00f3a PDF \u0111\u1ec3 g\u1ee1 b\u1ecf b\u1ea3o v\u1ec7 m\u1eadt kh\u1ea9u v\u00e0 truy c\u1eadp n\u1ed9i dung c\u1ee7a t\u1ec7p PDF \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 b\u1eb1ng m\u1eadt kh\u1ea9u.<\/p>\n<h2>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 m\u1edf kh\u00f3a t\u1ec7p PDF c\u1ee7a b\u1ea1n tr\u1ef1c tuy\u1ebfn<\/h2>\n<p>Ch\u00fang t\u00f4i s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n c\u00e1ch m\u1edf kh\u00f3a t\u1ec7p PDF b\u1eb1ng<a href=\"https:\/\/online.visual-paradigm.com\/online-pdf-editor\/\">Tr\u00ecnh ch\u1ec9nh s\u1eeda PDF mi\u1ec5n ph\u00ed tr\u1ef1c tuy\u1ebfn VP<\/a>.<br \/>\n<strong>B\u01b0\u1edbc 1: T\u1ea3i l\u00ean t\u1ec7p PDF \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7<\/strong><\/p>\n<p><img alt=\"\" class=\"alignnone wp-image-13232 size-full\" decoding=\"async\" height=\"564\" loading=\"lazy\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-09-06-at-4.42.15-PM-768x564-1.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-09-06-at-4.42.15-PM-768x564-1.png 768w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-09-06-at-4.42.15-PM-768x564-1-300x220.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-09-06-at-4.42.15-PM-768x564-1-150x110.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-09-06-at-4.42.15-PM-768x564-1-400x294.png 400w\" width=\"768\"\/><\/p>\n<p><strong>B\u01b0\u1edbc 2: Sau khi b\u1ea1n \u0111\u00e3 ho\u00e0n t\u1ea5t ch\u1ec9nh s\u1eeda<\/strong><\/p>\n<ul>\n<li>Nh\u1ea5n v\u00e0o \u201cXu\u1ea5t\u201d<\/li>\n<li>\u201cL\u01b0u d\u01b0\u1edbi d\u1ea1ng PDF\u201d<\/li>\n<\/ul>\n<p><img alt=\"\" class=\"alignnone wp-image-13247 size-full\" decoding=\"async\" height=\"241\" loading=\"lazy\" sizes=\"auto, (max-width: 350px) 100vw, 350px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.24.26-PM.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.24.26-PM.png 350w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.24.26-PM-300x207.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.24.26-PM-150x103.png 150w\" width=\"350\"\/><\/p>\n<p><strong>B\u01b0\u1edbc 3<\/strong>: \u0110i t\u1edbi<strong>Thu\u1ed9c t\u00ednh t\u00e0i li\u1ec7u<\/strong> -&gt; <strong>B\u1ea3o m\u1eadt<\/strong> -&gt; <strong>B\u1ea3o m\u1eadt t\u00e0i li\u1ec7u<\/strong><\/p>\n<p>Th\u1ef1c hi\u1ec7n t\u1ea5t c\u1ea3 c\u00e1c thay \u0111\u1ed5i c\u1ea7n thi\u1ebft li\u00ean quan \u0111\u1ebfn quy\u1ec1n h\u1ea1n v\u00e0 h\u1ea1n ch\u1ebf \u0111\u1ed1i v\u1edbi t\u00e0i li\u1ec7u PDF n\u00e0y. Sau \u0111\u00f3 nh\u1ea5n <strong>\u0110\u01b0\u1ee3c<\/strong> v\u00e0 <strong>Xu\u1ea5t<\/strong>.<\/p>\n<p><img alt=\"\" class=\"alignnone wp-image-13288 size-full\" decoding=\"async\" height=\"625\" loading=\"lazy\" sizes=\"auto, (max-width: 862px) 100vw, 862px\" src=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.58.32-PM.png\" srcset=\"https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.58.32-PM.png 862w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.58.32-PM-300x218.png 300w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.58.32-PM-768x557.png 768w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.58.32-PM-150x109.png 150w, https:\/\/blog.visual-paradigm.com\/wp-content\/uploads\/2022\/10\/Screenshot-2022-10-20-at-2.58.32-PM-400x290.png 400w\" width=\"862\"\/><\/p>\n<p><strong><span style=\"font-size: 18pt;\">Kh\u00e1m ph\u00e1 c\u00e1c t\u00ednh n\u0103ng m\u1ea1nh m\u1ebd c\u1ee7a <a href=\"https:\/\/online.visual-paradigm.com\/online-pdf-editor\/\">Tr\u00ecnh ch\u1ec9nh s\u1eeda PDF mi\u1ec5n ph\u00ed tr\u1ef1c tuy\u1ebfn Visual Paradigm<\/a>. Truy c\u1eadp ngay!!!<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>B\u1ea3o v\u1ec7 th\u00f4ng tin nh\u1ea1y c\u1ea3m c\u1ee7a b\u1ea1n b\u1eb1ng c\u00e1ch kh\u00f3a m\u1ed9t s\u1ed1 t\u1ec7p PDF. \u0110i\u1ec1u n\u00e0y s\u1ebd h\u1ea1n ch\u1ebf c\u00e1c thao t\u00e1c nh\u01b0 in \u1ea5n ho\u1eb7c ch\u1ec9nh s\u1eeda. V\u00ed d\u1ee5, c\u00e1c b\u00e1o c\u00e1o ng\u00e2n h\u00e0ng, h\u00f3a \u0111\u01a1n ho\u1eb7c h\u00f3a \u0111\u01a1n \u0111i\u1ec7n tho\u1ea1i ch\u1ee9a d\u1eef li\u1ec7u b\u00ed m\u1eadt n\u00ean \u0111\u01b0\u1ee3c b\u1ea3o v\u1ec7 t\u1ed1t nh\u1ea5t b\u1eb1ng [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11445,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"categories":[],"tags":[],"class_list":["post-11444","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","loop-entry","clr"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 m\u1edf kh\u00f3a PDF tr\u1ef1c tuy\u1ebfn - Visual Paradigm Blog<\/title>\n<meta name=\"description\" content=\"How to unlock PDF online. And also enable or remove writing and editing permissions. Then export as PDF again.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.visual-paradigm.com\/vn\/how-to-unlock-pdf-online\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 m\u1edf kh\u00f3a PDF tr\u1ef1c tuy\u1ebfn - Visual Paradigm Blog\" \/>\n<meta property=\"og:description\" content=\"How to unlock PDF online. And also enable or remove writing and editing permissions. 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