Compress PDF
Shrink PDF file size by re-encoding embedded images. Runs in your browser.
Runs entirely in your browser — files never uploaded
Drag & drop files here, or click to browse
PDF · up to 50 MB each
How to use Compress PDF
- 1. Upload your PDF(s). Drop one or more PDF files. You can compress several at once.
- 2. Click compress. We re-pack each PDF's internal structure to remove waste, without touching text or images.
- 3. Download. Each compressed file downloads automatically. The original is untouched.
FAQ
Is the compression lossless?
Yes. Text stays selectable, images stay sharp, formatting is identical. We only repack the PDF structure and strip unused metadata.
How much smaller will my PDF get?
It varies a lot. Text-heavy PDFs from Word or LaTeX often shrink 5–15%. PDFs that have been edited multiple times, or contain unused embedded fonts, can shrink 25–40%. Already-optimized PDFs may not shrink at all.
Does this work on password-protected PDFs?
No. Unlock the PDF first using its password, then upload the unlocked version.
Are my files uploaded to a server?
No. Compression runs entirely in your browser. The PDF never leaves your device.
Why didn't my image-heavy PDF shrink much?
Lossless mode preserves images as-is. To shrink image-heavy PDFs significantly you'd need to re-encode the embedded images at lower quality — that's an aggressive mode we plan to add next, since it loses text selection on scanned pages.