Compress PDF files online
Make PDF files smaller without uploading them anywhere. This tool rebuilds your PDF efficiently inside your browser — ideal before emailing an assignment or beating a tight upload limit. Choose Light mode for a lossless size cut, or Strong mode to turn heavy pages into sharp, optimized images. Free, no signup, and your files never leave your device.
How to use
- Click "Add PDF" or drop your file onto the box.
- Choose Light (lossless optimize) or Strong (smallest size).
- In Strong mode, pick the image quality that suits you.
- Press "Compress PDF" and wait a few seconds.
- Compare the two sizes shown, then click "Download".
Why use Outilverse?
Unlike classic PDF compressors, Outilverse never uploads your document — compression is computed on your own device, keeping confidential files safe. Two compression modes let you balance size against quality, and everything is free with no signup.
FAQ
Is my file uploaded to a server?
No. Compression is performed entirely in your browser — the file never leaves your device, even for a moment.
Why did the size barely change?
Text-only PDFs may already be well optimized — try Strong mode. Scanned or photo-heavy files shrink most with Strong mode and a slightly lower image quality.
Will the quality drop?
Light mode is lossless. Strong mode re-encodes visible pages as images, so choose Normal or High quality to keep text crisp.