Compress PDF files online, free. Reduce the size of scans and photo-heavy PDFs so they fit email limits and upload forms, while text stays sharp and selectable. It runs in your browser — the document is never uploaded.
Where the size comes from
Text and fonts take up very little space; images take up almost all of it. A scanned document is one full-page photo per page. Compressing resizes those images to a resolution that still looks sharp on screen and in print, and stores them more efficiently.
Text stays sharp
Only images are touched. Text, fonts and vector drawings are copied exactly, so the document stays crisp and searchable. If a file is already as small as it can be, you get the original back — never a larger file.
How to use Compress PDF
- 1Choose one or more PDFs.
- 2Pick a compression level — Recommended suits most files.
- 3Press Compress — it happens in your browser.
- 4Download the smaller PDF, or all of them as a ZIP.
When to use Compress PDF
- Getting a scanned document under an email attachment limit.
- Shrinking a CV, form or application to fit an upload size limit.
- Making photo-heavy reports and brochures quicker to share.
Tips
- Scans and PDFs full of photos shrink the most. A PDF that is mostly text is usually small already.
- Use Light for documents you will print, and Strong when you only need the smallest file.
Frequently asked questions
Is my PDF uploaded?
No. Compression happens entirely in your browser, so the file never leaves your device.
Will the text get blurry?
No. Only images are compressed; text and fonts are kept exactly as they were.
How much smaller will it get?
It depends on the file. Scanned and photo-heavy PDFs often shrink by half or more; text-only PDFs change little. The result shows the real saving, measured on your file.
Can the file get bigger?
Never. If nothing can be saved, you get your original file back unchanged.