Compress PDF

Reduce PDF file size while maintaining readability. Choose from Low, Balanced, or High quality presets.

Drop files here or click to upload

.pdf · Max 20 files

Or paste files with Ctrl+V

Your files never leave your browser

What is PDF Compress?

Compress PDF reduces file size while preserving readability. Three quality presets — Low, Balanced and High — let you trade size for fidelity. Compression works by re-encoding embedded images and pruning redundant resources.

How to use PDF Compress

Drop one or more PDF files (up to 20 at a time).
Pick a quality preset.
Click "Compress" — images are re-encoded and the document is repackaged.
Compare original vs compressed size and download the result.

Why use AinnoBox

100% browser-based — your file is never uploaded to a server
No file size limits imposed by us; only your device memory
Free with no sign-up, no email, no watermark on output
Works offline once the page is loaded
Strict Content Security Policy and HTTPS by default

Want to understand why AinnoBox processes everything in the browser rather than on servers? Read How It Works or check the FAQ.