Compress a PDF on your phone
No app to install, no account, no upload. It runs in the browser you already have open.
The compressor is on the front page. Set your target and go — nothing is uploaded.
Open the compressorWhy no app
Compressing a PDF is a few seconds of work. Installing an app for it means granting storage permissions, accepting a privacy policy, and in most cases uploading your document to that company's servers anyway — app stores are full of PDF utilities that are thin wrappers around a web API.
A web page that does the work locally avoids all of that. Nothing is installed, nothing is granted, and nothing is transmitted.
How to do it
- Open the compressor in your phone browser.
- Tap the box and choose your PDF. On iPhone this opens Files; on Android, your file picker or Drive.
- Type the size limit you need in KB.
- Tap Compress and wait — keep the tab in the foreground on older phones.
- Tap Download. The file lands in Files or Downloads.
What to expect on a phone
| Document | Typical time |
|---|---|
| 1–3 page text PDF | A few seconds |
| 10-page scan | 10–30 seconds |
| 50-page colour scan | 1–2 minutes, and may strain an older phone |
If a large file struggles, split it first, compress the parts, and merge them back.
Common questions
Does this work on a phone?
Yes. The tools are ordinary web pages and run in mobile Safari, Chrome and Firefox. There is nothing to install and no app.
Why is it slower than on a laptop?
Because the work happens on your device rather than a server. A phone processor doing image compression is simply slower than a laptop one. A few pages take seconds; a fifty-page colour scan may take a minute or two.
My phone browser ran out of memory
Very large documents can exhaust a phone. Split the file into parts first, compress each, then merge them back if you need one file. Closing other browser tabs helps more than you would expect.
Where does the compressed file go?
To wherever your browser saves downloads - Files on iOS, the Downloads folder on Android. Tap the download notification to open it.
Can I use it offline?
Once the page has loaded, yes. That is a side effect of processing locally: nothing needs a connection after load. It is also the easiest way to prove that your file is not being uploaded.