Compress PDF
Reduce PDF file size.
or drag and drop here
🔒 Your files never leave your device
How to use
Choose the PDF you want to make smaller
Pick a compression level (recommended suits most files)
Press Compress PDF and download the smaller file
About Compress PDF
Compress PDF makes large PDF files small enough for email attachments, job portals and government forms. Photos and scans are re-encoded intelligently while text and vector graphics stay perfectly sharp, so the document looks the same at a fraction of the size.
Compressing a PDF matters most for email attachments and upload forms, which often cap files at 2–10 MB. Scans and reports full of photos go over that limit easily. Compress PDF reworks the images inside the pages and usually cuts the file size by more than half.
The recommended level keeps text sharp; the strongest level gives the smallest file with slightly softer photos. Everything runs in your browser, so the document is never uploaded and there is no queue to wait in.
Tips
- If the file is already small, compression may not help; the site tells you and keeps the original.
- Use the recommended level to keep text selectable and crisp.
- For long scans, remove pages you don't need with Delete PDF Pages first.
- 100% free
- Files stay on your device
- No sign-up
- No watermark
- Works on mobile
Frequently asked questions
How much can a PDF be compressed?
Scans and photo-heavy PDFs often shrink by 50–90%. Text-only PDFs are already small and change less.
Which compression level should I choose?
Recommended keeps text crisp and suits almost every file. Choose Strong when you must hit a strict size limit.
Is Compress PDF free?
Yes. Compress PDF is completely free, needs no account and never adds a watermark to your files.
Are my files safe?
Yes. Your file is processed inside your browser on your own device; it is never uploaded or stored.
Can I use it on my phone?
Yes. Compress PDF works in every modern browser on iPhone and Android, no app needed.
Is it safe to use Compress PDF online?
Yes. Compress PDF processes your file on your own device, inside your browser. The file is never uploaded, stored or shared, and the connection is encrypted with HTTPS.
Does Compress PDF work on iPhone or Android without an app?
Yes. It works in Safari, Chrome and every modern browser — no app, no account.