Reduce PDF Size on iPhone or Android
You don't need an app to shrink a PDF on an iPhone: open this page in your browser, pick the file and compress it in a few taps. It works the same way when you compress PDF on Android, and you can type a target size in KB if the form you're filling has a limit.
Secure cloud processing
How to compress a PDF on your phone
- 1Open this page in your phone's browser and tap Select files.
- 2Choose the PDF from your Files app, your downloads, or a file you saved from an email.
- 3Keep the Recommended level, or type a target size in KB if there's an upload limit.
- 4Tap Compress PDF and wait for the upload and processing to finish.
- 5Tap Download. On iPhone the file usually goes to Files under Downloads; on Android, to your Downloads folder.
Good to know
- Use Wi-Fi for large files: the PDF is uploaded before it's compressed, and mobile data can be slow.
- If the PDF is attached to an email or a chat, save it to your phone first so it shows up in the file picker.
- Already have the file online? Use From link and paste its address instead of downloading it first.
- Keep the page open while it works; switching apps can pause the upload in some browsers.
Frequently asked questions
Do I need an app to compress a PDF on my phone?
No. Everything runs from this page in your phone's browser, so there's nothing to install.
Where is the compressed PDF saved on iPhone?
Usually in the Files app under Downloads, depending on your browser settings. You can share or attach it from there.
Is it free on mobile?
Yes, the same as on a computer: 3 free uses a day per tool, no sign-up. Files are uploaded encrypted and deleted right after processing.