Privacy-First & Open-Source PDF Tools
KissThePDF is built on a fundamental promise: your confidential documents should never leave your personal computer. Every PDF tool runs 100% locally in your web browser.
Zero Server Uploads
Your PDF files stay on your machine. Files are loaded directly into browser memory via JavaScript and WebAssembly buffers.
Client-Side WASM Engine
Leverages modern WebAssembly, pdf-lib, PDF.js, and browser Web Workers for fast document manipulation.
Fully Auditable Code
The entire codebase is published transparently on GitHub under the permissive MIT License. Anyone can inspect or self-host it.
Technical Stack & Architecture
Traditional PDF web tools rely on uploading your files to remote cloud servers where proprietary microservices render pages and modify files before sending them back. This introduces privacy risks, security vulnerabilities, and network bandwidth overhead.
KissThePDF takes the opposite approach:
- Next.js App Router & React for structured, performant user interfaces
- TypeScript for strict compile-time type safety across all 100 tool modules
- pdf-lib & pdfjs-dist for client-side PDF parsing, page manipulation, and rendering
- HTML5 Canvas API for real-time document previews & thumbnail generation
- Web Workers for non-blocking background file processing
Contribute to KissThePDF
KissThePDF is a community-driven open-source project. Whether you are fixing a bug, adding a new PDF utility, optimizing WASM memory performance, or improving documentation, contributions are welcome!