Compress PDF
Last updated: June 1, 2026In-browserReduce PDF file size online.
Compress PDF is a free online tool to reduce PDF file size online. It runs entirely in your browser, so your files never leave your device — nothing is uploaded. There's no sign-up, no watermark, and it works on any modern browser on desktop or mobile.
How to use Compress PDF
Compress PDF shrinks large PDF files right in your browser — ideal for scans and image-heavy documents that are too big to email or upload. It reduces the file size while keeping the document readable, with no upload, no watermark and no sign-up.
Read the full guide: How to Compress a PDF (Reduce File Size, Free)
- 1Drop in your PDF.
- 2The tool optimizes and recompresses the document.
- 3Download the smaller PDF — processed entirely on your device.
Beat upload limits
Get scans and image-heavy PDFs under common email and portal size limits.
Private by design
Your document is compressed locally and never uploaded to a server.
No watermark
The compressed PDF is clean — no stamps, no sign-up, no trial caps.
Compress PDF — frequently asked questions
How do I make a PDF smaller to email it?
Drop the PDF in, let it compress, then download — image-heavy and scanned PDFs usually shrink the most.
Will compressing affect the text or quality?
Text stays sharp; the savings come mostly from optimizing embedded images, so the document stays readable.
Which PDFs compress the most?
Scanned documents and PDFs with lots of photos shrink the most. Text-only PDFs are already small.
Is it safe and private?
Yes — the PDF is processed in your browser and never leaves your device.
Is it free?
Yes, free with no watermark and no account.
Share this tool
Send it to someone who needs it or save the link for later.