Free browser PDF tool
Compress PDF Online Free
Choose text-preserving cleanup or create a smaller image-based copy of a scanned PDF. Files never leave your device. Image mode removes text selection, search and links; use a disposable scan copy.
Compress a PDF on your device
PDF · up to 40 MB · up to 60 pages · all pages retained
Image mode removes selectable text, search, links and accessibility structure. Use it only for a disposable scan copy. Signed, encrypted and interactive form PDFs are not supported.
Files never leave your device. Free. No upload. No account.
How to use this tool
- 1
Choose a PDF up to 40 MB and 60 pages.
- 2
Select text-preserving cleanup, or confirm the limits of image mode.
- 3
Compare the sizes and download the result. If it is not smaller, the original is returned.
Are PDFs uploaded to a server?
No. This V1 PDF tool runs locally in your browser where technically possible. Cobalt Tools does not upload or store selected files.
Is this PDF tool free?
Yes. The browser PDF tools on Cobalt Tools are free to use.
Will this always reduce PDF size?
No. Already optimized PDFs may not shrink. If the generated copy is not smaller, the tool offers the unchanged original. The optional scan-image mode can reduce image-heavy files, but removes selectable text, search and links.
Related free PDF tools
Nearby PDF tools for organizing, converting, resizing and editing files in the browser.