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Compress PDF
Make a PDF dramatically smaller directly in your browser. Strong mode re-renders pages for big savings on scans; lossless mode tidies the file structure without touching content. Your files never leave your device. No sign-up, free.
Runs 100% in your browser No size or file limits Free, no sign-up
How to compress a PDF
Add your PDF
Drag and drop a PDF anywhere in the box, or click to browse. You will see every page and the current file size.
Pick the compression mode
Strong re-renders each page as an optimized image - huge savings on scans and photo-heavy files, with a resolution and quality you control. Lossless rebuilds the file structure and keeps text selectable.
Convert and download
Click Convert, compare the before and after size in the footer, and download. Everything is compressed on your own device.
PDF compression questions, answered
Are my PDFs uploaded to a server?
No. Everything happens in your browser using its own processing power. Your documents never leave your device - there is no upload, no queue and nothing to delete from a server afterwards.
How much smaller will my PDF get?
Scans and image-heavy files typically shrink by 80-95% in Strong mode - a 15 MB scan can come out under 1 MB. Lossless mode is modest, usually a few percent, because it only optimizes structure without touching content.
What is the catch with Strong mode?
Pages are re-rendered as images, so text is no longer selectable or searchable in the compressed file - visually it stays crisp at the resolution you chose. Use Lossless when you need the text layer intact.
Which settings should I use for emailing a scan?
Strong mode at 100 DPI with quality around 75 is the sweet spot for scanned documents - comfortably under most attachment limits while staying perfectly readable.
Does it work with password-protected PDFs?
Not yet. Protected files are detected and flagged so nothing silently breaks. Remove the password in your PDF viewer first, then come back here.