Compress PDF

Compression reduces file size by downsampling embedded images (reducing their pixel density), applying lossless stream compression to text and graphics data, and removing redundant data structures from the file.

Low compression gives the smallest size reduction but preserves the most quality. High compression gives the largest size reduction but may reduce image sharpness. Medium is the standard choice for most documents.

Text-heavy PDFs typically shrink 10–30%. Image-heavy PDFs can reduce 50–80% on High compression. PDFs that are already compressed may barely change.

Yes. Text is stored as vectors in PDF, not pixels, so compression does not affect text sharpness regardless of the level chosen.

You can try, but gains will be minimal. If a PDF was already highly compressed, the tool will return a file similar in size to the input.

Yes. Compression runs in your browser. Your file is never uploaded to any server.