Compress PDF Online Free
Make a heavy PDF smaller without leaving your browser. Great for scans, photo-filled reports and design exports that are too big to email or upload. Pick how hard to compress, see the new size, and download — your file is never uploaded.
Your files never leave your device. All processing happens locally in your browser.
Drag & drop your PDF here
or click to browse
Files never leave your device
Up to 50MB per file
Why use this tool
Real Size Savings
Heavy scans and image-rich PDFs are re-encoded at a sensible resolution, often cutting file size by half or more.
100% Private
Files are processed entirely in your browser using the Canvas and WebAssembly APIs. Nothing is ever uploaded to a server.
You Choose the Trade-off
Three levels let you balance file size against quality, with the resulting size shown before you download.
Free Forever
No account, no watermark, no daily limits. Every tool on PixelResize is free to use as often as you like.
How to compress pdf
- 1
Upload the PDF you want to shrink.
- 2
Pick a compression level — high, balanced or light.
- 3
We re-encode each page locally and show the new size.
- 4
Download your smaller PDF.
Frequently asked questions
Related tools & sizes
How to Compress a PDF to Email It Without Losing Readability
A scanned PDF that's too big to send is almost always full of high-resolution images. Here's how to shrink it to fit email and upload limits while keeping it readable.