Compress PDF on Android

No. Open this page in Chrome or any modern Android browser, tap the drop zone, and select your PDF from Downloads, Google Drive or your file manager. Compression runs inside the browser tab and the result goes straight to your Downloads folder.

Most request broad storage permissions, display intrusive ads and — critically — upload your document to their servers for processing, which is the opposite of what a compression tool needs to do. A browser page requires no permissions and keeps the file on your device throughout.

Yes. Once the page has loaded, the compression engine is running locally in the browser. You can switch to airplane mode and still compress files, which is handy when you are on a limited data plan.

Yes. Bookmarks, the table of contents, internal cross-references, hyperlink annotations and interactive form fields all survive compression. Only the encoding of images and content streams is altered — the document's structural and navigational layers are preserved.

Yes. The interface is fully responsive and the engine runs on iOS and Android. Bear in mind that mobile devices have less memory, so very large files (over roughly 50 MB) may be slow or fail on older phones.

No. Compression runs entirely inside your browser using WebAssembly. Your PDF is read into local memory, processed on your own CPU and written straight back to your downloads folder. No network request ever carries the file.

Because it was already efficient. Files that are mostly text, or that were exported by a tool which already downsampled its images, hold very little recoverable waste. Large savings come from oversized embedded images — where there are none, there is little to reclaim.

Compression is one-way, but your original file is never modified — it stays exactly where it was on your device. The compressed version is written as a separate download, so you always retain the source and can simply try again with a gentler preset.

Not directly. Encrypted PDFs must have their password removed first, which you can do in Acrobat, Preview on macOS, or by opening the file and re-printing it to PDF with the password supplied. Then compress the unprotected copy here.

Both, layered. Structural optimization — removing duplicate objects, dead revisions and metadata — is entirely lossless. Image downsampling and JPEG re-encoding are lossy, which is where the substantial savings come from. Text and vector graphics are never touched by either stage.