Question 1

Is this Compress PDF tool free to use?

Accepted Answer

Yes. It's free, with no sign-up and no account required. The limits listed below apply to every file.

Question 2

Is my PDF uploaded anywhere?

Accepted Answer

No. Your PDF is processed entirely in your browser using local WebAssembly and never uploaded. Your file contents are never transmitted to any server or recorded anywhere.

Question 3

What are the limits?

Accepted Answer

The PDF can be up to 50 MB and 1,000 pages. These are practical processing limits for working in your browser, so a very large PDF can still be slow or fail on some devices.

Question 4

What is the difference between Lossless and Raster compression?

Accepted Answer

Lossless mode uses structural flate recompression and object streams to reduce file size while keeping 100% of selectable text, hyperlinks, bookmarks, and vector graphics intact. Raster modes (Balanced and Max) convert pages into images for maximum file size reduction, which flattens text and links.

Question 5

Will compression reduce my PDF's quality or make text unselectable?

Accepted Answer

In Lossless mode (the default), text clarity, vector sharpness, and selectability are 100% preserved. In Balanced and Max raster modes, pages are rendered into compressed JPEG images, which flattens text and hyperlinks.

Question 6

What happens if my PDF cannot be compressed any further?

Accepted Answer

If a PDF is already maximally compressed, the tool reports this honestly and provides the original file for download. It never applies artificial inflation or degrades document quality if no savings are possible.

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