⊙ Compress PDF
Reduce PDF file size so it's easier to email and upload. Best for scan-heavy or image-heavy PDFs.
Drop a file here or click to browse
PDF · processed privately on your device
Compress PDF shrinks bulky documents so they're easy to email and upload. Slate re-encodes the pages at your chosen quality level right in the browser, which works especially well on scanned or image-heavy PDFs. Pick a quality, compress, and see exactly how much you saved.
How to compress pdf
- Drop in the PDF you want to shrink.
- Choose a compression level (Recommended works for most files).
- Download the smaller PDF and see the size saved.
Frequently asked questions
How much smaller will my PDF get?
It depends on the content. Scanned and image-heavy PDFs often shrink 40-70%. Slate shows the before-and-after size after compressing.
Will compression hurt quality?
There's a small quality trade-off on images. Use Light compression to stay crisp, or Strong compression when small size matters most.
Are my files uploaded to a server?
No. Slate processes your PDF entirely in your browser. Your files never leave your device, which is faster and far more private than typical online tools.
Is Compress PDF really free?
Yes. Compress PDF is completely free with no signup and no limits. Slate is funded by unobtrusive ads, not subscriptions.