How to shrink a PDF's file size on Android
You don't need special software to shrink a PDF's file size on Android. FernPDF runs entirely in Chrome on Android: open the tool, drop your file, download the result. Compression re-encodes the document on your device. Image-heavy and scanned PDFs shrink the most, often 60–90%.
On Android, you tap the drop zone to open the native picker, then choose Google Drive, Downloads, or your device's local storage. Once the smaller file is ready, it downloads to your Downloads folder, opened from Chrome's download tray, or from the Files by Google app if your phone doesn't show a Downloads shortcut.
File management varies by manufacturer (Samsung's My Files, stock Android's Files by Google, and others), but the picker itself stays consistent: it's the same system dialog Chrome always uses, regardless of phone brand.
Works with files from Google Drive, Downloads or local storage. Because nothing uploads, it's quick even on mobile data, because you only pay bandwidth for the page itself.
Step by step
- 1Open the Compress PDF Online Free: Reduce PDF File Size tool in Chrome on Android. No install, no account.
- 2Add your PDF: tap the drop zone to open the native picker, then choose Google Drive, Downloads, or your device's local storage.
- 3Pick a level: Less, Recommended, or Strong, and preview the estimated savings.
- 4Click “Compress PDF” and download the smaller file. It lands in your Downloads folder, opened from Chrome's download tray, or from the Files by Google app if your phone doesn't show a Downloads shortcut.
Common questions
Every FernPDF tool processes files in your browser: read how the privacy model works, or verify it yourself in your network tab.