Thinknex
Thinknex provides a suite of free online PDF tools designed to make everyday PDF tasks simple and private. All file processing happens inside your browser — files are never uploaded to a server.
Core features
- Merge & Split: Combine multiple PDFs or split a PDF into separate pages/ranges.
- Compress: Reduce PDF file size by re-encoding page images.
- Convert: Convert between PDF and other formats (Word, PowerPoint, images).
- Edit & Sign: Draw, add text, annotate, and embed signatures using an integrated canvas editor.
- Watermark & Rotate: Securely add watermarks and rotate pages.
Why use client-side tools?
Processing files locally ensures maximum privacy and control — nothing leaves your device. These tools are ideal for sensitive documents and quick edits without installing software.