Make a PDF file smaller without losing the pages you need. Upload your PDF, choose how much to shrink it, and download a lighter file — free, with no sign-up, right in your browser.
Big PDFs are slow to email and hard to upload to forms. Compress PDF trims the file size down so it is easier to send, share and store, while keeping the document readable.
Compress PDF
Rebuild a PDF into a smaller file where possible — the tool shows the real before and after sizes.
🔒 Privacy: this tool runs entirely in your browser. Your files and text never leave your device — nothing is uploaded to any server.
What is Compress PDF?
Compress PDF is a free online tool that reduces the size of a PDF file. It rebuilds your PDF in your browser and shows you the real file size before and after, so you can see exactly how much smaller it got.
The tool runs entirely in your browser. Your file is processed on your own device and is never uploaded to a server, so what is in your PDF stays private.
How it works
- Choose the PDF file you want to make smaller, or drag it into the tool.
- Pick a compression level — a lighter touch keeps more quality, a stronger one makes a smaller file.
- Click Compress and wait a moment while the PDF is rebuilt.
- Download your smaller PDF and check the before and after sizes shown by the tool.
Frequently asked questions
Is Compress PDF free?
Yes, it is completely free to use, with no account or sign-up needed.
Are my files uploaded anywhere?
No. The compression happens in your browser, on your own device, so your files are never uploaded to a server.
Why did my PDF barely shrink?
Text-only PDFs are already small, so there is little to squeeze out — the tool is honest about that and shows you the real before and after sizes. PDFs with large images shrink much more.