Your PDFs Never Leave Your Device
PDFDiet is different. Most PDF tools upload your files to a server. We don't. Here's how it works.
Three Simple Steps
Select your PDF
Drag and drop or tap to choose a file. The PDF stays on your device—nothing is uploaded anywhere.
Compression happens in your browser
We use Ghostscript (a professional-grade tool) compiled to run directly in your browser. Your file is processed right on your computer, phone, or tablet.
Download your smaller file
The compressed PDF is created locally. Download it directly to your device. We never see it, store it, or have access to it.
Why This Matters
Most online PDF tools work like this: you upload your file to their server, they process it, and send it back. That means:
- ✗Your sensitive documents pass through their servers
- ✗They might keep copies (even if they say they don't)
- ✗Your data could be breached if their servers are hacked
With PDFDiet, there's no server involved. Your files physically cannot be accessed by us or anyone else.
Common Questions
Is it really free?
Yes, completely free. No hidden fees, no premium tier, no limits on how many PDFs you compress. If you find it useful, you can buy me a coffee.
How much can it compress?
It depends on your PDF. Files with lots of images typically compress 50-80%. PDFs that are already optimized may not get much smaller. Try it and see!
Will it reduce quality?
You choose the compression level. "Balanced" works great for most uses. For important documents you'll print, choose "High Quality".
What browsers are supported?
Any modern browser: Chrome, Firefox, Safari, Edge. Works on phones and tablets too.
No sign-up required. Just compress.