Compress PDF
Reduce PDF size in your browser. Lossless mode re-packs the file; strong mode converts pages to compressed images for scanned documents.
- Free, no limits
- Runs in your browser
- No sign-up
Loading tool…
How to use the Compress PDF
- Choose a PDF.
- Pick Lossless (keeps text selectable) or Strong (best for scans).
- Compare sizes and download.
Frequently asked questions
What is the difference between the modes?
Lossless rewrites the PDF structure efficiently and keeps text selectable. Strong renders each page as a JPG image — much smaller for scans, but text is no longer selectable.
Why did the size barely change?
Already-optimised PDFs can't shrink much losslessly. Try Strong mode with a lower quality.
Is my PDF uploaded?
No. Everything runs inside your browser. Your files and text never leave your device and nothing is stored on our servers.
Related tools
Merge PDFCombine multiple PDF files into one in the order you choose. Runs entirely in your…Split PDFExtract page ranges like 1-3,5 into a new PDF, or split every page into separate…Image CompressorCompress JPG, PNG and WebP images in your browser. Pick quality, see the size saved…Image to PDFCombine photos and scans into one PDF on A4, Letter or original size, in the order you…