Compress PDF Online – Reduce PDF Size Offline
Use this private, client‑side tool to compress PDF files instantly. Adjust quality and DPI to balance clarity and reduce PDF size – no upload needed. Perfect for quick PDF compression before sharing.
How PDF Compression Works
Compression is performed locally by rasterizing pages at your selected DPI and JPEG quality using pdf.js and rebuilding the file with pdf-lib. Documents never leave your device.
Why Compress PDFs Client‑Side?
- Privacy: nothing is uploaded
- Control: choose DPI and quality per your needs
- Speed: immediate output in the browser
- Offline ready once assets are cached
Tip: Try 110–144 DPI and 60% quality for a strong size reduction while keeping good readability.