Empowering Your
Document Workflow
PDFTheory is a free, privacy-focused PDF toolkit that runs entirely in your browser. With 110+ professional tools, you can edit, convert, merge, split, and secure your PDF files without ever uploading them to a server.
Trusted by professionals worldwide
Our Mission
We believe that everyone should have access to powerful PDF tools without compromising their privacy or paying expensive subscription fees. That's why we created PDFTheory – a comprehensive PDF toolkit that puts your privacy first.
Unlike traditional PDF services that require you to upload your files to remote servers, PDFTheory processes everything locally in your browser. Your sensitive documents never leave your device, giving you complete control over your data.
Whether you're a student, professional, or casual user, PDFTheory provides all the tools you need to work with PDFs efficiently and securely.
- Browser-based Processing
- No Server Uploads
- Works Offline
- Open Source
Our Values
The principles that drive every feature we build.
Privacy First
Your files never leave your device. All processing happens locally in your browser, ensuring complete privacy and security.
Fast & Efficient
Powered by modern web technologies, pdftheory delivers lightning-fast PDF processing without the need for uploads or downloads.
Accessible Everywhere
Available in 9 languages and works on any device with a modern browser. No installation required.
Free Forever
pdftheory is completely free to use with no hidden costs, no registration required, and no limits on usage.
Open Source
Built with transparency in mind. Our code is open source, allowing anyone to verify our privacy claims.
Community Driven
Developed with feedback from users around the world. We continuously improve based on your needs.
Built with Modern Technology
PDFTheory is built using cutting-edge web technologies to ensure the best possible experience: