mousePDFAbout mousePDF
mousePDF is a free tool for editing PDF files — right in your browser, without a file ever leaving your computer. There is no upload, no server storing your documents, no sign-up and no limits.
Why does mousePDF exist?
We all know the feeling: you just want to change something quickly in a PDF — fix a line of text, combine pages for a job application, sign a contract. Many PDF tools that offer the genuinely useful features cost money or require an account. On top of that, most free PDF tools online upload your file to a server. That means your data sits on a distant server you don't control — at a company you don't know. That is not only a privacy problem but often a speed problem too.
mousePDF takes a different approach: all the editing happens locally in your browser. Your PDF file is never sent to a server at any point. The tool uses proven open-source libraries (pdf.js for display, pdf-lib for writing) that run directly in the page, in your own local browser.
What can mousePDF do?
- Open a PDF and merge multiple documents
- Add text and replace existing PDF text
- Insert, freely position, and scale images
- Draw, highlight, and comment
- Sign a document (drawn or typed)
- Reorder, rotate, delete, and insert pages at a position
- Compress a PDF (only when it actually helps)
- Set and remove a password
- Convert PDF ⇄ Word and PDF → images
- Export without a watermark
- Available in 41 languages
What does it cost?
mousePDF is free. Every feature is free to use — no trial period, no subscription, no watermarks, no limits. The site is funded by advertising (Google AdSense). If you'd like to support the project, you can leave a voluntary donation when you export.
Technology
mousePDF is a purely client-side application. There's no build step and no hidden server calls. All libraries are hosted locally — the Content Security Policy allows only our own, self-hosted analytics software (Matomo) in the editor, no third parties beyond that. The site even works offline once it has loaded. Ideal for use in regions with a poor internet connection.