How does this compressor work?

It rasterizes every page at the chosen resolution, JPEG-compresses the result, and rebuilds a new PDF. This is the most reliable way to shrink image-heavy PDFs without server-side tooling. The trade-off is that text becomes part of the page image, so it's no longer selectable.

Will text remain selectable?

No — rasterizing turns the page into an image. If text selection matters, this is the wrong tool. For text-heavy PDFs, look at the source application's "Save smaller PDF" option, or use a desktop tool that does lossless object-stream compression.

What DPI should I choose?

150 DPI gives screen-quality results that are visually identical for most viewers. 100 DPI is enough for archives and email. 200+ DPI is suitable for printing.

No. Rendering and compression run in your browser via pdf.js + Canvas + pdf-lib.

SnapTools

Files never leave your device

Compress PDF Online

Reduce PDF size by recompressing images embedded in the document. Choose your quality target, see the size before and after.

Drag and drop a file here

or click to browse

One PDF

How to use PDF Compress

Drop a PDF.
Pick a target DPI and JPEG quality. Lower = smaller file.
Click "Compress". Each page is rasterized at the chosen DPI and re-encoded.
Download the smaller PDF.

How to use PDF Compress

Frequently asked questions

How does this compressor work?

Will text remain selectable?

What DPI should I choose?

Are files uploaded?