How to compress a PDF online without losing quality
Reduce PDF file size for email and uploads while keeping it readable — free, private, and in your browser.
3 min read · Updated June 9, 2026
Try it now: Compress PDF
Open toolWhy PDFs get so large
Most oversized PDFs are heavy because of high-resolution images and embedded fonts. Email attachment limits (often 25 MB) and upload forms that cap at 5 or 10 MB make a bloated PDF a real problem. Compressing it solves this in seconds.
How to compress a PDF
1. Open the Compress PDF tool and add your file.
2. Let it optimise images and structure to shrink the size.
3. Download the smaller file — readable, shareable, and still selectable text.
Your file stays private
Compression runs in your browser. The PDF is never uploaded to a server, so even sensitive documents stay completely on your device.