Reduce PDF file size — no restrictions
Last updated: 2026-10-08
Compress PDF is a free online tool that reduces PDF file size by converting each page to an image and re-encoding it at a quality level you choose: High, Medium, or Low. It works best for scanned documents and image-heavy PDFs, where the savings can be large. Because pages become images, text in the compressed file can no longer be selected or searched, so keep your original if you need editable or searchable text. If the result would not be smaller than your original, the tool returns your original file unchanged instead of a bigger one. All processing happens inside your browser, so your file is never uploaded to a server. PDF Master Pro does not set a file-size limit, though very large files depend on your device's memory and may be slow. No account, login, or installation is required, and it works on desktop and mobile browsers.
It depends on the content. Scanned and image-heavy PDFs often shrink a lot; text-heavy PDFs may shrink little or not at all. If the result would not be smaller, you get your original file back.
Yes. Each page is converted to an image, so text can no longer be selected or searched. Use High Quality for documents you will read or print, Medium for email, and Low for maximum size reduction.
We do not set one. Files are processed in your browser, so very large PDFs depend on your device memory and can be slow or fail on phones.
Yes. All processing happens in your browser. Your file never leaves your device or gets uploaded to any server.
Most PDFs compress in 5–30 seconds depending on file size and your device speed.
Yes, all 32 tools are 100% free forever. No hidden charges, no premium version, no login required.
No. We have zero file size restrictions. Process any PDF of any size, as many times as you want.