BigPDF — PDF 编辑、合并、拆分、签名与转换
Nguyễn Văn Trình · Firefox
编辑、合并、拆分、签名、涂黑并将 PDF 转为 Word/Excel/PPT — 14 款工具在浏览器中 100% 离线运行，免费试用。
截图
简介
BigPDF is a full PDF toolkit that lives in your browser — 14 of its 15 tools process your files entirely offline, with nothing ever uploaded to a server. Open a file, use a tool, download the result. That's it
WHAT'S INSIDE
✅ Edit PDF — rotate, delete, and reorder pages; insert text and images
✅ Annotate PDF — highlight, underline, freehand drawing, notes, stamps
✅ Redact PDF — permanently black out sensitive content
✅ Watermark — stamp text watermarks across every page
✅ Page numbers — add page numbers with custom position and format
✅ Compress PDF — shrink file size (keep text, or rasterize + JPEG)
✅ Merge PDF — combine multiple files in your chosen order
✅ Split PDF — split every N pages or by custom ranges, zipped for you
✅ Extract pages — pull out just the pages you need
✅ Sign PDF — draw or type a signature, drag-and-drop it onto the page
✅ PDF → JPG — render every page as an image (zipped if multiple)
✅ PDF → Word (.docx) — extract text, line by line
✅ PDF → Excel (.xlsx) — reconstruct tables from text coordinates
✅ PDF → PowerPoint (.pptx) — one slide per page, as an image
✅ AI Assistant (optional, not offline) — summarize or ask questions about a PDF via an AI endpoint you configure with your own API key
AN HONEST LIMITATION
The Word/Excel/PowerPoint conversions run fully offline, so they preserve content, not pixel-perfect layout — Word output is line-based text, Excel reconstructs tables from text position (works best on already-tabular PDFs), and PowerPoint places one page-image per slide. True layout-perfect conversion needs a heavy server-side OCR/layout engine, which isn't something we can (or want to) run silently in your browser.
PRIVACY FIRST
• 14 of 15 tools never send your file anywhere — everything happens locally in your browser (some tools use a local WebAssembly module for speed)
• The one exception, AI Assistant, is clearly labeled, opt-in, and requires your own API key before anything leaves your browser
• No analytics and no session recording — BigPDF collects nothing
• No content scripts and no access to the pages you browse
• No account required for the free tier
• Full privacy policy: https://getpekka.com/en/privacy/bigpdf/
SIMPLE PRICING
• 5 free tool uses per week (all tools share one pool, resets weekly)
• Monthly — $9 / month, cancel anytime
• Yearly — $49 / year (save 55% vs monthly) ⭐ most popular
• Lifetime — $99 one-time, no renewal
Paid plans remove the weekly limit across all 15 tools.
PERFECT FOR
• Anyone who needs to edit, sign, or convert a PDF without uploading it to a random website
• Students and professionals merging, splitting, or extracting pages regularly
• Anyone who wants a quick redaction or watermark tool without installing desktop software
• Multilingual users — the interface is available in more than 50 languages
BigPDF — PDF 编辑、合并、拆分、签名与转换 是做什么的
BigPDF — PDF 编辑、合并、拆分、签名与转换 是一款面向 Firefox 的实用工具类扩展，主要用来解决浏览器里某类具体的小问题。官方对它的介绍是：编辑、合并、拆分、签名、涂黑并将 PDF 转为 Word/Excel/PPT — 14 款工具在浏览器中 100% 离线运行，免费试用。在Firefox 附加组件商店（AMO）上，它当前版本 1.3.1，约 37 名用户。
适合什么人用
从功能定位看，BigPDF — PDF 编辑、合并、拆分、签名与转换 更适合想补上浏览器原生缺失功能的用户。如果你平时只是偶尔遇到相关需求，用浏览器自带功能也能凑合；但如果这件事每天都发生，装一个专门处理它的扩展通常比手动操作省事得多。
怎么安装 BigPDF — PDF 编辑、合并、拆分、签名与转换
- 打开Firefox 附加组件商店（AMO）上的官方页面；
- 点「添加到浏览器」并确认权限提示；
- 装好后在扩展列表里固定图标，方便随时开关。
本站只做索引与介绍，安装包来自官方商店。如果商店页面提示当前地区不可用，说明该扩展未在你所在区域上架。
常见问题
BigPDF — PDF 编辑、合并、拆分、签名与转换 是免费的吗？
BigPDF — PDF 编辑、合并、拆分、签名与转换 在Firefox 附加组件商店（AMO）免费提供下载。它是浏览器扩展，装上就能直接用，不需要注册账号。
BigPDF — PDF 编辑、合并、拆分、签名与转换 安全吗？
它只申请了 0 项权限，范围比较克制，没有申请「读取所有网站数据」这种大权限。
BigPDF — PDF 编辑、合并、拆分、签名与转换 支持哪些浏览器？
当前收录的版本来自Firefox 附加组件商店（AMO），适用于 Firefox。同一个扩展在其他商店可能有对应版本，但功能与版本号不一定相同。
怎么卸载 BigPDF — PDF 编辑、合并、拆分、签名与转换？
在扩展管理页找到 BigPDF — PDF 编辑、合并、拆分、签名与转换，点移除即可。它在本地保存的设置会一起清掉，不会残留数据。
权限清单 来自 manifest.json 原文
接口权限 1
storage