About

PDF Modifier is a set of free PDF tools that anyone can use safely. With nothing but a web browser — no installation and no account — you can merge, split, reorder, compress and convert PDF files.

PDF tools that never upload your files

Most online PDF services upload your files to their servers. PDF Modifier uses WebAssembly and modern browser technology to do all processing on your own device. Contracts, certificates and ID copies never leave your computer, and there is no waiting for uploads or downloads.

Tools

• Organize pages: Merge PDF, Split PDF, Organize PDF, Rotate PDF, Delete PDF Pages, Extract PDF Pages
• Optimize: Compress PDF
• Convert: JPG to PDF, PDF to JPG
• Edit: Add Watermark, Add Page Numbers
• Security: Protect PDF, Unlock PDF

How the site is funded

Every tool is free. The site is supported by the ads shown on its pages. Because files are not processed on servers, running costs stay low, so there are no limits on usage or file size.

Open source

This service is built on these open-source projects:

• pdf-lib (@cantoo/pdf-lib) — MIT License
• PDF.js — Apache License 2.0
• fflate — MIT License
• Preact — MIT License
• Astro — MIT License

Contact

Suggestions, bug reports and partnership inquiries: contact@pdfmodifier.app