[{"data":1,"prerenderedAt":35},["ShallowReactive",2],{"4556712":3},{"type_of":4,"id":5,"title":6,"description":7,"readable_publish_date":8,"slug":9,"path":10,"url":11,"comments_count":12,"public_reactions_count":12,"collection_id":13,"published_timestamp":14,"language":15,"subforem_id":12,"ai_disclosure_level":16,"ai_disclosure_label":17,"positive_reactions_count":12,"cover_image":13,"social_image":18,"canonical_url":11,"created_at":14,"edited_at":13,"crossposted_at":13,"published_at":14,"last_comment_at":19,"reading_time_minutes":20,"tag_list":21,"tags":22,"body_html":27,"body_markdown":28,"user":29},"article",4556712,"How to Encrypt PDF Files in the Browser with Vue 3 and pdf-lib","Encrypting PDFs in the browser requires careful handling of passwords and encryption standards....","Sep 2","how-to-encrypt-pdf-files-in-the-browser-with-vue-3-and-pdf-lib-135k","/sunshey/how-to-encrypt-pdf-files-in-the-browser-with-vue-3-and-pdf-lib-135k","https://dev.to/sunshey/how-to-encrypt-pdf-files-in-the-browser-with-vue-3-and-pdf-lib-135k",1,null,"2026-09-02T13:45:31Z","en","not_disclosed","Not Disclosed","https://media2.dev.to/dynamic/image/width=1200,height=627,fit=cover,gravity=auto,format=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Farticles%2Fdi5hh63flmnfmo3f8pi0.png","2026-09-02T14:15:34Z",2,"webdev, pdf, javascript, vue",[23,24,25,26],"webdev","pdf","javascript","vue","\u003Cp>Encrypting PDFs in the browser requires careful handling of passwords and encryption standards. Here's how to build a browser-based PDF encryption tool with Vue 3 and \u003Ccode>pdf-lib\u003C/code>.\u003C/p>\n\n\u003Ch2>\n  \u003Ca name=\"the-challenge-password-management-and-security\" href=\"#the-challenge-password-management-and-security\">\n  \u003C/a>\n  The challenge: Password management and security\n\u003C/h2>\n\n\u003Cp>PDF encryption involves:\u003C/p>\n\n\u003Col>\n\u003Cli>Generating secure encryption keys from passwords\u003C/li>\n\u003Cli>Supporting different encryption levels (128-bit, 256-bit)\u003C/li>\n\u003Cli>Setting document permissions (print, copy, modify)\u003C/li>\n\u003Cli>Ensuring compatibility with PDF readers\u003C/li>\n\u003C/ol>\n\n\u003Ch2>\n  \u003Ca name=\"the-stack\" href=\"#the-stack\">\n  \u003C/a>\n  The stack\n\u003C/h2>\n\n\u003Cul>\n\u003Cli>\n\u003Cstrong>Vue 3\u003C/strong> with Composition API\u003C/li>\n\u003Cli>\n\u003Cstrong>pdf-lib\u003C/strong> for PDF manipulation\u003C/li>\n\u003Cli>\n\u003Cstrong>Vite\u003C/strong> for bundling\u003C/li>\n\u003C/ul>\n\n\u003Ch2>\n  \u003Ca name=\"the-core-implementation\" href=\"#the-core-implementation\">\n  \u003C/a>\n  The core implementation\n\u003C/h2>\n\n\n\n\u003Cdiv class=\"highlight js-code-highlight\">\n\u003Cpre class=\"highlight vue\">\u003Ccode>\u003Cspan class=\"nt\"><\u003C/span>\u003Cspan class=\"k\">script\u003C/span> \u003Cspan class=\"na\">setup\u003C/span> \u003Cspan class=\"na\">lang=\u003C/span>\u003Cspan class=\"s\">\"ts\"\u003C/span>\u003Cspan class=\"nt\">>\u003C/span>\n\u003Cspan class=\"k\">import\u003C/span> \u003Cspan class=\"p\">{\u003C/span> \u003Cspan class=\"nx\">ref\u003C/span> \u003Cspan class=\"p\">}\u003C/span> \u003Cspan class=\"k\">from\u003C/span> \u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"s1\">vue\u003C/span>\u003Cspan class=\"dl\">'\u003C/span>\n\u003Cspan class=\"k\">import\u003C/span> \u003Cspan class=\"p\">{\u003C/span> \u003Cspan class=\"nx\">PDFDocument\u003C/span>\u003Cspan class=\"p\">,\u003C/span> \u003Cspan class=\"nx\">EncryptionOptions\u003C/span> \u003Cspan class=\"p\">}\u003C/span> \u003Cspan class=\"k\">from\u003C/span> \u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"s1\">pdf-lib\u003C/span>\u003Cspan class=\"dl\">'\u003C/span>\n\n\u003Cspan class=\"kd\">const\u003C/span> \u003Cspan class=\"nx\">file\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"nx\">ref\u003C/span>\u003Cspan class=\"o\"><\u003C/span>\u003Cspan class=\"nx\">File\u003C/span> \u003Cspan class=\"o\">|\u003C/span> \u003Cspan class=\"kc\">null\u003C/span>\u003Cspan class=\"o\">>\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"kc\">null\u003C/span>\u003Cspan class=\"p\">)\u003C/span>\n\u003Cspan class=\"kd\">const\u003C/span> \u003Cspan class=\"nx\">password\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"nf\">ref\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"dl\">''\u003C/span>\u003Cspan class=\"p\">)\u003C/span>\n\u003Cspan class=\"kd\">const\u003C/span> \u003Cspan class=\"nx\">confirmPassowrd\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"nf\">ref\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"dl\">''\u003C/span>\u003Cspan class=\"p\">)\u003C/span>\n\u003Cspan class=\"kd\">const\u003C/span> \u003Cspan class=\"nx\">encryptionLevel\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"nx\">ref\u003C/span>\u003Cspan class=\"o\"><\u003C/span>\u003Cspan class=\"mi\">128\u003C/span> \u003Cspan class=\"o\">|\u003C/span> \u003Cspan class=\"mi\">256\u003C/span>\u003Cspan class=\"o\">>\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"mi\">256\u003C/span>\u003Cspan class=\"p\">)\u003C/span>\n\u003Cspan class=\"kd\">const\u003C/span> \u003Cspan class=\"nx\">encrypting\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"nf\">ref\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"kc\">false\u003C/span>\u003Cspan class=\"p\">)\u003C/span>\n\u003Cspan class=\"kd\">const\u003C/span> \u003Cspan class=\"nx\">result\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"nx\">ref\u003C/span>\u003Cspan class=\"o\"><\u003C/span>\u003Cspan class=\"nb\">Uint8Array\u003C/span> \u003Cspan class=\"o\">|\u003C/span> \u003Cspan class=\"kc\">null\u003C/span>\u003Cspan class=\"o\">>\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"kc\">null\u003C/span>\u003Cspan class=\"p\">)\u003C/span>\n\n\u003Cspan class=\"k\">async\u003C/span> \u003Cspan class=\"kd\">function\u003C/span> \u003Cspan class=\"nf\">encryptPdf\u003C/span>\u003Cspan class=\"p\">()\u003C/span> \u003Cspan class=\"p\">{\u003C/span>\n  \u003Cspan class=\"k\">if \u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"o\">!\u003C/span>\u003Cspan class=\"nx\">file\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span> \u003Cspan class=\"o\">||\u003C/span> \u003Cspan class=\"o\">!\u003C/span>\u003Cspan class=\"nx\">password\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span>\u003Cspan class=\"p\">)\u003C/span> \u003Cspan class=\"k\">return\u003C/span>\n  \u003Cspan class=\"k\">if \u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"nx\">password\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span> \u003Cspan class=\"o\">!==\u003C/span> \u003Cspan class=\"nx\">confirmPassowrd\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span>\u003Cspan class=\"p\">)\u003C/span> \u003Cspan class=\"p\">{\u003C/span>\n    \u003Cspan class=\"nf\">alert\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"s1\">Passwords do not match\u003C/span>\u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"p\">)\u003C/span>\n    \u003Cspan class=\"k\">return\u003C/span>\n  \u003Cspan class=\"p\">}\u003C/span>\n\n  \u003Cspan class=\"nx\">encrypting\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"kc\">true\u003C/span>\n\n  \u003Cspan class=\"kd\">const\u003C/span> \u003Cspan class=\"nx\">arrayBuffer\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"k\">await\u003C/span> \u003Cspan class=\"nx\">file\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nf\">arrayBuffer\u003C/span>\u003Cspan class=\"p\">()\u003C/span>\n  \u003Cspan class=\"kd\">const\u003C/span> \u003Cspan class=\"nx\">pdf\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"k\">await\u003C/span> \u003Cspan class=\"nx\">PDFDocument\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nf\">load\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"nx\">arrayBuffer\u003C/span>\u003Cspan class=\"p\">)\u003C/span>\n\n  \u003Cspan class=\"kd\">const\u003C/span> \u003Cspan class=\"nx\">encryptionOptions\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"nx\">EncryptionOptions\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"p\">{\u003C/span>\n    \u003Cspan class=\"na\">ownerPassword\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"nx\">password\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span>\u003Cspan class=\"p\">,\u003C/span>\n    \u003Cspan class=\"na\">userPassword\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"nx\">password\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span>\u003Cspan class=\"p\">,\u003C/span>\n    \u003Cspan class=\"na\">permissions\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"p\">{\u003C/span>\n      \u003Cspan class=\"na\">printing\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"s1\">highResolution\u003C/span>\u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"p\">,\u003C/span>\n      \u003Cspan class=\"na\">modifying\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"kc\">false\u003C/span>\u003Cspan class=\"p\">,\u003C/span>\n      \u003Cspan class=\"na\">copying\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"kc\">false\u003C/span>\u003Cspan class=\"p\">,\u003C/span>\n      \u003Cspan class=\"na\">annotating\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"kc\">false\u003C/span>\u003Cspan class=\"p\">,\u003C/span>\n      \u003Cspan class=\"na\">fillingForms\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"kc\">false\u003C/span>\u003Cspan class=\"p\">,\u003C/span>\n      \u003Cspan class=\"na\">contentAccessibility\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"kc\">false\u003C/span>\u003Cspan class=\"p\">,\u003C/span>\n      \u003Cspan class=\"na\">documentAssembly\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"kc\">false\u003C/span>\u003Cspan class=\"p\">,\u003C/span>\n    \u003Cspan class=\"p\">},\u003C/span>\n    \u003Cspan class=\"na\">encryption\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"nx\">encryptionLevel\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span> \u003Cspan class=\"o\">===\u003C/span> \u003Cspan class=\"mi\">256\u003C/span> \u003Cspan class=\"p\">?\u003C/span> \u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"s1\">AES_256\u003C/span>\u003Cspan class=\"dl\">'\u003C/span> \u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"s1\">AES_128\u003C/span>\u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"p\">,\u003C/span>\n  \u003Cspan class=\"p\">}\u003C/span>\n\n  \u003Cspan class=\"nx\">result\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"k\">await\u003C/span> \u003Cspan class=\"nx\">pdf\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nf\">save\u003C/span>\u003Cspan class=\"p\">({\u003C/span>\n    \u003Cspan class=\"na\">encryption\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"nx\">encryptionOptions\u003C/span>\u003Cspan class=\"p\">,\u003C/span>\n  \u003Cspan class=\"p\">})\u003C/span>\n\n  \u003Cspan class=\"nx\">encrypting\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"kc\">false\u003C/span>\n\u003Cspan class=\"p\">}\u003C/span>\n\u003Cspan class=\"nt\"></\u003C/span>\u003Cspan class=\"k\">script\u003C/span>\u003Cspan class=\"nt\">>\u003C/span>\n\u003C/code>\u003C/pre>\n\u003Cdiv class=\"highlight__panel js-actions-panel\">\n\u003Cdiv class=\"highlight__panel-action js-fullscreen-code-action\">\n    \u003Csvg xmlns=\"http://www.w3.org/2000/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\">\u003Ctitle>Enter fullscreen mode\u003C/title>\n    \u003Cpath d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\">\u003C/path>\n\u003C/svg>\n\n    \u003Csvg xmlns=\"http://www.w3.org/2000/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\">\u003Ctitle>Exit fullscreen mode\u003C/title>\n    \u003Cpath d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\">\u003C/path>\n\u003C/svg>\n\n\u003C/div>\n\u003C/div>\n\u003C/div>\n\n\n\n\u003Ch2>\n  \u003Ca name=\"key-implementation-details\" href=\"#key-implementation-details\">\n  \u003C/a>\n  Key implementation details\n\u003C/h2>\n\n\u003Ch3>\n  \u003Ca name=\"1-password-validation\" href=\"#1-password-validation\">\n  \u003C/a>\n  1. Password validation\n\u003C/h3>\n\n\u003Cp>Ensure passwords match and meet minimum requirements:\u003Cbr>\n\u003C/p>\n\n\u003Cdiv class=\"highlight js-code-highlight\">\n\u003Cpre class=\"highlight typescript\">\u003Ccode>\u003Cspan class=\"k\">if \u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"nx\">password\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span> \u003Cspan class=\"o\">!==\u003C/span> \u003Cspan class=\"nx\">confirmPassowrd\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span>\u003Cspan class=\"p\">)\u003C/span> \u003Cspan class=\"p\">{\u003C/span>\n  \u003Cspan class=\"k\">throw\u003C/span> \u003Cspan class=\"k\">new\u003C/span> \u003Cspan class=\"nc\">Error\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"s1\">Passwords do not match\u003C/span>\u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"p\">)\u003C/span>\n\u003Cspan class=\"p\">}\u003C/span>\n\u003Cspan class=\"k\">if \u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"nx\">password\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">length\u003C/span> \u003Cspan class=\"o\"><\u003C/span> \u003Cspan class=\"mi\">8\u003C/span>\u003Cspan class=\"p\">)\u003C/span> \u003Cspan class=\"p\">{\u003C/span>\n  \u003Cspan class=\"k\">throw\u003C/span> \u003Cspan class=\"k\">new\u003C/span> \u003Cspan class=\"nc\">Error\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"s1\">Password must be at least 8 characters\u003C/span>\u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"p\">)\u003C/span>\n\u003Cspan class=\"p\">}\u003C/span>\n\u003C/code>\u003C/pre>\n\u003Cdiv class=\"highlight__panel js-actions-panel\">\n\u003Cdiv class=\"highlight__panel-action js-fullscreen-code-action\">\n    \u003Csvg xmlns=\"http://www.w3.org/2000/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\">\u003Ctitle>Enter fullscreen mode\u003C/title>\n    \u003Cpath d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\">\u003C/path>\n\u003C/svg>\n\n    \u003Csvg xmlns=\"http://www.w3.org/2000/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\">\u003Ctitle>Exit fullscreen mode\u003C/title>\n    \u003Cpath d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\">\u003C/path>\n\u003C/svg>\n\n\u003C/div>\n\u003C/div>\n\u003C/div>\n\n\n\n\u003Ch3>\n  \u003Ca name=\"2-encryption-level-selection\" href=\"#2-encryption-level-selection\">\n  \u003C/a>\n  2. Encryption level selection\n\u003C/h3>\n\n\u003Cp>pdf-lib supports both 128-bit and 256-bit encryption:\u003Cbr>\n\u003C/p>\n\n\u003Cdiv class=\"highlight js-code-highlight\">\n\u003Cpre class=\"highlight typescript\">\u003Ccode>\u003Cspan class=\"kd\">const\u003C/span> \u003Cspan class=\"nx\">encryption\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"nx\">encryptionLevel\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span> \u003Cspan class=\"o\">===\u003C/span> \u003Cspan class=\"mi\">256\u003C/span> \n  \u003Cspan class=\"p\">?\u003C/span> \u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"s1\">AES_256\u003C/span>\u003Cspan class=\"dl\">'\u003C/span> \n  \u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"s1\">AES_128\u003C/span>\u003Cspan class=\"dl\">'\u003C/span>\n\u003C/code>\u003C/pre>\n\u003Cdiv class=\"highlight__panel js-actions-panel\">\n\u003Cdiv class=\"highlight__panel-action js-fullscreen-code-action\">\n    \u003Csvg xmlns=\"http://www.w3.org/2000/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\">\u003Ctitle>Enter fullscreen mode\u003C/title>\n    \u003Cpath d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\">\u003C/path>\n\u003C/svg>\n\n    \u003Csvg xmlns=\"http://www.w3.org/2000/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\">\u003Ctitle>Exit fullscreen mode\u003C/title>\n    \u003Cpath d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\">\u003C/path>\n\u003C/svg>\n\n\u003C/div>\n\u003C/div>\n\u003C/div>\n\n\n\n\u003Ch3>\n  \u003Ca name=\"3-permission-settings\" href=\"#3-permission-settings\">\n  \u003C/a>\n  3. Permission settings\n\u003C/h3>\n\n\u003Cp>Control what recipients can do with the encrypted PDF:\u003Cbr>\n\u003C/p>\n\n\u003Cdiv class=\"highlight js-code-highlight\">\n\u003Cpre class=\"highlight typescript\">\u003Ccode>\u003Cspan class=\"nx\">permissions\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"p\">{\u003C/span>\n  \u003Cspan class=\"nl\">printing\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"s1\">highResolution\u003C/span>\u003Cspan class=\"dl\">'\u003C/span>\u003Cspan class=\"p\">,\u003C/span>  \u003Cspan class=\"c1\">// Allow high-res printing\u003C/span>\n  \u003Cspan class=\"nx\">modifying\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"kc\">false\u003C/span>\u003Cspan class=\"p\">,\u003C/span>            \u003Cspan class=\"c1\">// Prevent modifications\u003C/span>\n  \u003Cspan class=\"nx\">copying\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"kc\">false\u003C/span>\u003Cspan class=\"p\">,\u003C/span>              \u003Cspan class=\"c1\">// Prevent text extraction\u003C/span>\n  \u003Cspan class=\"nx\">annotating\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"kc\">false\u003C/span>\u003Cspan class=\"p\">,\u003C/span>           \u003Cspan class=\"c1\">// Prevent annotations\u003C/span>\n  \u003Cspan class=\"nx\">fillingForms\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"kc\">false\u003C/span>\u003Cspan class=\"p\">,\u003C/span>         \u003Cspan class=\"c1\">// Prevent form filling\u003C/span>\n  \u003Cspan class=\"nx\">contentAccessibility\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"kc\">false\u003C/span>\u003Cspan class=\"p\">,\u003C/span> \u003Cspan class=\"c1\">// Prevent screen reader access\u003C/span>\n  \u003Cspan class=\"nx\">documentAssembly\u003C/span>\u003Cspan class=\"p\">:\u003C/span> \u003Cspan class=\"kc\">false\u003C/span>\u003Cspan class=\"p\">,\u003C/span>     \u003Cspan class=\"c1\">// Prevent document assembly\u003C/span>\n\u003Cspan class=\"p\">}\u003C/span>\n\u003C/code>\u003C/pre>\n\u003Cdiv class=\"highlight__panel js-actions-panel\">\n\u003Cdiv class=\"highlight__panel-action js-fullscreen-code-action\">\n    \u003Csvg xmlns=\"http://www.w3.org/2000/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\">\u003Ctitle>Enter fullscreen mode\u003C/title>\n    \u003Cpath d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\">\u003C/path>\n\u003C/svg>\n\n    \u003Csvg xmlns=\"http://www.w3.org/2000/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\">\u003Ctitle>Exit fullscreen mode\u003C/title>\n    \u003Cpath d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\">\u003C/path>\n\u003C/svg>\n\n\u003C/div>\n\u003C/div>\n\u003C/div>\n\n\n\n\u003Ch3>\n  \u003Ca name=\"4-password-strength-feedback\" href=\"#4-password-strength-feedback\">\n  \u003C/a>\n  4. Password strength feedback\n\u003C/h3>\n\n\u003Cp>Provide real-time feedback on password strength:\u003Cbr>\n\u003C/p>\n\n\u003Cdiv class=\"highlight js-code-highlight\">\n\u003Cpre class=\"highlight typescript\">\u003Ccode>\u003Cspan class=\"kd\">const\u003C/span> \u003Cspan class=\"nx\">passwordStrength\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"nf\">computed\u003C/span>\u003Cspan class=\"p\">(()\u003C/span> \u003Cspan class=\"o\">=>\u003C/span> \u003Cspan class=\"p\">{\u003C/span>\n  \u003Cspan class=\"kd\">const\u003C/span> \u003Cspan class=\"nx\">pwd\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"nx\">password\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">value\u003C/span>\n  \u003Cspan class=\"kd\">let\u003C/span> \u003Cspan class=\"nx\">strength\u003C/span> \u003Cspan class=\"o\">=\u003C/span> \u003Cspan class=\"mi\">0\u003C/span>\n  \u003Cspan class=\"k\">if \u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"nx\">pwd\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nx\">length\u003C/span> \u003Cspan class=\"o\">>=\u003C/span> \u003Cspan class=\"mi\">8\u003C/span>\u003Cspan class=\"p\">)\u003C/span> \u003Cspan class=\"nx\">strength\u003C/span>\u003Cspan class=\"o\">++\u003C/span>\n  \u003Cspan class=\"k\">if \u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"sr\">/\u003C/span>\u003Cspan class=\"se\">[\u003C/span>\u003Cspan class=\"sr\">A-Z\u003C/span>\u003Cspan class=\"se\">]\u003C/span>\u003Cspan class=\"sr\">/\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nf\">test\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"nx\">pwd\u003C/span>\u003Cspan class=\"p\">))\u003C/span> \u003Cspan class=\"nx\">strength\u003C/span>\u003Cspan class=\"o\">++\u003C/span>\n  \u003Cspan class=\"k\">if \u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"sr\">/\u003C/span>\u003Cspan class=\"se\">[\u003C/span>\u003Cspan class=\"sr\">a-z\u003C/span>\u003Cspan class=\"se\">]\u003C/span>\u003Cspan class=\"sr\">/\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nf\">test\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"nx\">pwd\u003C/span>\u003Cspan class=\"p\">))\u003C/span> \u003Cspan class=\"nx\">strength\u003C/span>\u003Cspan class=\"o\">++\u003C/span>\n  \u003Cspan class=\"k\">if \u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"sr\">/\u003C/span>\u003Cspan class=\"se\">[\u003C/span>\u003Cspan class=\"sr\">0-9\u003C/span>\u003Cspan class=\"se\">]\u003C/span>\u003Cspan class=\"sr\">/\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nf\">test\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"nx\">pwd\u003C/span>\u003Cspan class=\"p\">))\u003C/span> \u003Cspan class=\"nx\">strength\u003C/span>\u003Cspan class=\"o\">++\u003C/span>\n  \u003Cspan class=\"k\">if \u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"sr\">/\u003C/span>\u003Cspan class=\"se\">[^\u003C/span>\u003Cspan class=\"sr\">A-Za-z0-9\u003C/span>\u003Cspan class=\"se\">]\u003C/span>\u003Cspan class=\"sr\">/\u003C/span>\u003Cspan class=\"p\">.\u003C/span>\u003Cspan class=\"nf\">test\u003C/span>\u003Cspan class=\"p\">(\u003C/span>\u003Cspan class=\"nx\">pwd\u003C/span>\u003Cspan class=\"p\">))\u003C/span> \u003Cspan class=\"nx\">strength\u003C/span>\u003Cspan class=\"o\">++\u003C/span>\n  \u003Cspan class=\"k\">return\u003C/span> \u003Cspan class=\"nx\">strength\u003C/span>\n\u003Cspan class=\"p\">})\u003C/span>\n\u003C/code>\u003C/pre>\n\u003Cdiv class=\"highlight__panel js-actions-panel\">\n\u003Cdiv class=\"highlight__panel-action js-fullscreen-code-action\">\n    \u003Csvg xmlns=\"http://www.w3.org/2000/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\">\u003Ctitle>Enter fullscreen mode\u003C/title>\n    \u003Cpath d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\">\u003C/path>\n\u003C/svg>\n\n    \u003Csvg xmlns=\"http://www.w3.org/2000/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\">\u003Ctitle>Exit fullscreen mode\u003C/title>\n    \u003Cpath d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\">\u003C/path>\n\u003C/svg>\n\n\u003C/div>\n\u003C/div>\n\u003C/div>\n\n\n\n\u003Ch2>\n  \u003Ca name=\"limitations\" href=\"#limitations\">\n  \u003C/a>\n  Limitations\n\u003C/h2>\n\n\u003Ch3>\n  \u003Ca name=\"no-password-recovery\" href=\"#no-password-recovery\">\n  \u003C/a>\n  No password recovery\n\u003C/h3>\n\n\u003Cp>If the password is lost, the PDF cannot be decrypted.\u003C/p>\n\n\u003Cp>\u003Cstrong>Solution\u003C/strong>: Always store passwords securely and provide clear warnings.\u003C/p>\n\n\u003Ch3>\n  \u003Ca name=\"browser-memory\" href=\"#browser-memory\">\n  \u003C/a>\n  Browser memory\n\u003C/h3>\n\n\u003Cp>Very large PDFs may cause memory issues during encryption.\u003C/p>\n\n\u003Cp>\u003Cstrong>Solution\u003C/strong>: Process in smaller batches or use Web Workers.\u003C/p>\n\n\u003Ch3>\n  \u003Ca name=\"compatibility\" href=\"#compatibility\">\n  \u003C/a>\n  Compatibility\n\u003C/h3>\n\n\u003Cp>Some older PDF readers don't support 256-bit encryption.\u003C/p>\n\n\u003Cp>\u003Cstrong>Solution\u003C/strong>: Offer 128-bit as a fallback option.\u003C/p>\n\n\u003Ch2>\n  \u003Ca name=\"summary\" href=\"#summary\">\n  \u003C/a>\n  Summary\n\u003C/h2>\n\n\u003Cp>Building a browser-based PDF encryption tool involves:\u003C/p>\n\n\u003Col>\n\u003Cli>Loading the PDF with pdf-lib\u003C/li>\n\u003Cli>Validating password strength and confirmation\u003C/li>\n\u003Cli>Applying encryption with desired permissions\u003C/li>\n\u003Cli>Saving and downloading the encrypted PDF\u003C/li>\n\u003C/ol>\n\n\u003Cp>Try it at \u003Ca href=\"https://en.sotool.top/encrypt\" target=\"_blank\" rel=\"noopener noreferrer\">en.sotool.top/encrypt\u003C/a>.\u003C/p>\n\n","Encrypting PDFs in the browser requires careful handling of passwords and encryption standards. Here's how to build a browser-based PDF encryption tool with Vue 3 and `pdf-lib`.\n\n## The challenge: Password management and security\n\nPDF encryption involves:\n\n1. Generating secure encryption keys from passwords\n2. Supporting different encryption levels (128-bit, 256-bit)\n3. Setting document permissions (print, copy, modify)\n4. Ensuring compatibility with PDF readers\n\n## The stack\n\n- **Vue 3** with Composition API\n- **pdf-lib** for PDF manipulation\n- **Vite** for bundling\n\n## The core implementation\n\n```vue\n\u003Cscript setup lang=\"ts\">\nimport { ref } from 'vue'\nimport { PDFDocument, EncryptionOptions } from 'pdf-lib'\n\nconst file = ref\u003CFile | null>(null)\nconst password = ref('')\nconst confirmPassowrd = ref('')\nconst encryptionLevel = ref\u003C128 | 256>(256)\nconst encrypting = ref(false)\nconst result = ref\u003CUint8Array | null>(null)\n\nasync function encryptPdf() {\n  if (!file.value || !password.value) return\n  if (password.value !== confirmPassowrd.value) {\n    alert('Passwords do not match')\n    return\n  }\n  \n  encrypting.value = true\n\n  const arrayBuffer = await file.value.arrayBuffer()\n  const pdf = await PDFDocument.load(arrayBuffer)\n\n  const encryptionOptions: EncryptionOptions = {\n    ownerPassword: password.value,\n    userPassword: password.value,\n    permissions: {\n      printing: 'highResolution',\n      modifying: false,\n      copying: false,\n      annotating: false,\n      fillingForms: false,\n      contentAccessibility: false,\n      documentAssembly: false,\n    },\n    encryption: encryptionLevel.value === 256 ? 'AES_256' : 'AES_128',\n  }\n\n  result.value = await pdf.save({\n    encryption: encryptionOptions,\n  })\n  \n  encrypting.value = false\n}\n\u003C/script>\n```\n\n## Key implementation details\n\n### 1. Password validation\n\nEnsure passwords match and meet minimum requirements:\n\n```typescript\nif (password.value !== confirmPassowrd.value) {\n  throw new Error('Passwords do not match')\n}\nif (password.value.length \u003C 8) {\n  throw new Error('Password must be at least 8 characters')\n}\n```\n\n### 2. Encryption level selection\n\npdf-lib supports both 128-bit and 256-bit encryption:\n\n```typescript\nconst encryption = encryptionLevel.value === 256 \n  ? 'AES_256' \n  : 'AES_128'\n```\n\n### 3. Permission settings\n\nControl what recipients can do with the encrypted PDF:\n\n```typescript\npermissions: {\n  printing: 'highResolution',  // Allow high-res printing\n  modifying: false,            // Prevent modifications\n  copying: false,              // Prevent text extraction\n  annotating: false,           // Prevent annotations\n  fillingForms: false,         // Prevent form filling\n  contentAccessibility: false, // Prevent screen reader access\n  documentAssembly: false,     // Prevent document assembly\n}\n```\n\n### 4. Password strength feedback\n\nProvide real-time feedback on password strength:\n\n```typescript\nconst passwordStrength = computed(() => {\n  const pwd = password.value\n  let strength = 0\n  if (pwd.length >= 8) strength++\n  if (/[A-Z]/.test(pwd)) strength++\n  if (/[a-z]/.test(pwd)) strength++\n  if (/[0-9]/.test(pwd)) strength++\n  if (/[^A-Za-z0-9]/.test(pwd)) strength++\n  return strength\n})\n```\n\n## Limitations\n\n### No password recovery\n\nIf the password is lost, the PDF cannot be decrypted.\n\n**Solution**: Always store passwords securely and provide clear warnings.\n\n### Browser memory\n\nVery large PDFs may cause memory issues during encryption.\n\n**Solution**: Process in smaller batches or use Web Workers.\n\n### Compatibility\n\nSome older PDF readers don't support 256-bit encryption.\n\n**Solution**: Offer 128-bit as a fallback option.\n\n## Summary\n\nBuilding a browser-based PDF encryption tool involves:\n\n1. Loading the PDF with pdf-lib\n2. Validating password strength and confirmation\n3. Applying encryption with desired permissions\n4. Saving and downloading the encrypted PDF\n\nTry it at [en.sotool.top/encrypt](https://en.sotool.top/encrypt).",{"name":30,"username":30,"twitter_username":13,"github_username":30,"user_id":31,"website_url":32,"profile_image":33,"profile_image_90":34},"sunshey",3960024,"https://en.sotool.top","https://media2.dev.to/dynamic/image/width=640,height=640,fit=cover,gravity=auto,format=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3960024%2F275eb34f-65b0-4b9d-b739-824cfbf6c2cb.png","https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https%3A%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3960024%2F275eb34f-65b0-4b9d-b739-824cfbf6c2cb.png",1788519848661]