Why didn't my PDF shrink much?

Browser-side compression re-packs the PDF object stream and removes metadata; it does not recompress embedded images. If your PDF is mostly photos or scans that are already efficiently compressed, savings will be small.

What does “Strip metadata” do?

It clears the title, author, subject, keywords, creator and producer fields and resets the creation/modification timestamps. This can slightly reduce size and removes identifying information.

No. Compression happens entirely in your browser using pdf-lib. Open DevTools → Network to confirm zero outbound requests.

Will it reduce image quality?

No. Embedded images are preserved byte-for-byte. Only the PDF container is reorganized.

Can I compress multiple PDFs at once?

This tool processes one file at a time. Run it on each PDF, or merge them first and then compress the merged result.

Compress PDF

Re-pack a PDF to shrink its file size — local, private, instant.

100% private — no uploads PDF ToolsFree & unlimited Read tutorial

See how it works

Watch a quick simulation of this tool in action — no file needed.

How to use Compress PDF

Follow these steps — everything happens instantly in your browser.

1
Step 1. Drop your PDF onto the zone.
2
Step 2. Toggle “Strip metadata” if you also want to remove title, author and other document properties.
3
Step 3. Click “Compress PDF” — the re-packed file is built locally and shown side-by-side with the original size.
4
Step 4. Download the compressed PDF. Size reduction varies — image-heavy PDFs may not shrink because images aren't recompressed.