How it works
Compress PDF runs on this page, in browser memory. The file you choose is never sent to a server: it is read through the File API, processed locally and handed back as a download.
In three steps
- Choose a file from your device, or drag it onto the drop area.
- Adjust the options on the right, if the tool has settings.
- Press “Process locally” and download the result.
What it takes and what it returns
This tool accepts PDF and produces PDF. The work is done by PDF.js + pdf-lib.
Real limits
These limits come from what a browser can do safely, not from a paid plan:
- Up to 120 pages per job.
- Rendering a page is capped at 16 million pixels.
What it does not do
Compression re-renders pages as images, so it suits scans. If the document has selectable text, the original is kept unchanged.
Common questions
Do my files reach a server?
No. Processing happens in browser memory. The network is used only to download the application's libraries, and your file's contents are not part of those requests.
Which formats does Compress PDF accept?
It accepts PDF and produces PDF.
Do I need an account?
No. The tool works without an account and without installing anything during the free pilot.
Does it work on a phone?
Yes, in current browsers. Very large files can exceed the memory a phone has available, in which case the job stops with a clear message.