Compress PDF
Make scanned and image-heavy PDFs small enough for email and upload forms.
Pages are converted to optimized images, so text in the result is not selectable. Best for scans and image-heavy PDFs.
Runs 100% in your browser. Your files are not uploaded to any server.
How to use Compress PDF
- Drop a PDF into the box.
- Pick a compression level: Strong for the smallest file, Light for the best quality.
- Optionally convert to grayscale for an even smaller file.
- Click “Compress PDF” and compare the new size before downloading.
Frequently asked questions
Which compression level should I choose?
Balanced works for most documents. Use Strong when you must meet a strict size limit, and Light when the pages contain small print or detailed images.
Will I still be able to select text?
No. To shrink the file, each page is turned into an optimized image. This is ideal for scans and photos, but if you need selectable text, keep the original.
Is Compress PDF free?
Yes. Compress PDF is free to use with no sign-up and no watermark.
Are my files uploaded to your server?
No. All processing happens locally in your browser using JavaScript and WebAssembly. Your files never leave your device, which also makes it fast and private.
Does it work on my phone?
Yes. It works in any modern browser on Windows, Mac, Linux, Android and iPhone. Very large files may be slow on older phones.