Compress PDF Online — Free PDF Compressor
Reduce file size
Large PDF files can be a problem when emailing documents, uploading to portals, or simply trying to save storage space. Our free PDF compressor reduces file size by optimizing internal structures and embedded resources while preserving readability.
The entire compression process runs in your browser. Your file is never uploaded to a server, which means it stays private and the result is available instantly. No signup, no watermarks, and no limits on how many files you can compress.
How to Compress PDF
- Upload the PDF file you want to compress.
- Wait a moment while the tool optimizes the file in your browser.
- Download the compressed PDF and compare the file size.
Why Use Our Compress PDF Tool
This compressor is free, fast, and respects your privacy. Because it runs client-side, there is no upload wait time and no risk of your data being intercepted. It works on any device with a browser — desktop, tablet, or phone — with zero installation.
Need more advanced features?
Adobe Acrobat Pro
Advanced editing, OCR, e-signatures, and batch processing
Your Privacy Matters
All compression is performed locally using JavaScript in your browser. Your PDF never leaves your device, is never stored on a server, and is never accessible to anyone but you. Close the tab and all data is gone.