Compress PDF — Reduce PDF File Size Online
Shrink bulky PDFs so they fit inside email attachments, upload limits and cloud storage quotas — without noticeably degrading quality. All compression happens locally in your browser.
Compress PDF
Reduce file size by re-encoding pages (Low / SD / HD)
Estimated output size (sampled from first page)
SD (balanced, ~40%)
Pages are re-rendered to images at the chosen quality. Text becomes non-selectable — use HD if you need clarity, Low for smallest size.
About the Compress PDF tool
The Compress PDF tool removes redundant metadata and re-encodes objects to trim file size while keeping text sharp and images legible. It's ideal for compressing scanned documents, image-heavy reports and long PDFs before sharing.
Because compression runs on your device, you can safely reduce the size of confidential PDFs — legal briefs, medical charts, HR files — without exposing them to any third-party server.
Key features of Compress PDF
- One-click, lossless-first compression
- Handles image-heavy and scanned PDFs
- No file uploaded — 100% browser processing
- Keeps text selectable and hyperlinks working
- Free and unlimited use with no watermark
- Runs on desktop, tablet, and mobile browsers
How to use Compress PDF
- Upload the PDF you want to compress.
- Wait a few seconds while your browser optimizes it.
- Preview the estimated new file size.
- Download the smaller PDF to your device.
Common use cases
- Shrink attachments to fit Gmail, Outlook and WhatsApp limits
- Reduce upload time for cloud storage and forms
- Prepare portfolios and design decks for the web
- Compress scanned invoices and receipts for archiving
- Speed up email delivery of large contracts
Frequently asked questions
How much can I shrink my PDF?
It depends on the content — text-heavy PDFs shrink modestly, while image-heavy or scanned PDFs can often be reduced by 30–70%.
Will compression reduce the quality of my PDF?
The tool aims to keep text and vector graphics untouched. Image quality may reduce slightly, but the result stays legible for everyday use.
Can I compress multiple PDFs at once?
Compress one file at a time to keep quality predictable. For batches, run the tool repeatedly — every run is free.
Is this tool safe to use with confidential files?
Yes. Every file is processed locally inside your web browser using JavaScript and WebAssembly. Nothing is uploaded to a server, stored, or shared — so contracts, invoices, medical records and personal documents stay 100% private on your device.
Is it really free? Are there any limits or watermarks?
Yes, it's completely free with no sign-up, no daily limits, and no watermarks stamped on your output. Process a single file or hundreds — the only limit is your device's memory.