Compress PDF — Reduce File Size

Attempt to reduce a PDF's file size through structural optimization.

Upload a PDF to re-save it with optimized internal structure. This works best on text-heavy PDFs with a lot of repeated objects; PDFs that are mostly large embedded images will see little to no reduction, since real image recompression isn't reliably possible with the client-side library this tool uses. The before/after size is always shown honestly, even when the change is small.

Your files and text are processed locally in your browser — nothing is uploaded to a server.

Maximum file size: 50 MB.

Compress PDF tool

How to Use Compress PDF

  1. Upload a PDF.
  2. Click Compress.
  3. Compare the before/after size, then download if it's smaller.

Features

  • Honest before/after size comparison
  • Works entirely in your browser
  • Best results on text-heavy PDFs
  • Clear disclosure when little reduction is possible

Frequently Asked Questions

Why didn't my file get smaller?

If your PDF is mostly made up of large embedded images, this tool's structural optimization won't meaningfully shrink it — real image recompression requires more advanced processing than is reliably available client-side.

Is this the same as the compression used by dedicated desktop PDF software?

No, dedicated software can recompress embedded images and fonts; this tool performs safer, lighter-weight structural optimization only.