Android doesn't have a built-in PDF compressor, but compressing a PDF from an Android device is straightforward using Chrome and a browser-based tool. The process takes about a minute and doesn't require installing any app.
Using a Browser Tool in Chrome
Open Chrome on your Android device and go to WukongPDF's PDF Compression tool. Tap the upload button and navigate to the PDF in your Files or Downloads folder. After uploading, the tool processes the file and provides a download link. Tap the link to download the compressed version โ it saves to your Downloads folder automatically.
The browser approach works on any Android version and doesn't depend on manufacturer-specific features. It applies intelligent compression โ lossless optimization for text and vector content, and optimized JPEG compression for embedded images โ rather than a blanket reduction that degrades quality indiscriminately. For a PDF that's mostly text, expect 20-40% size reduction. For an image-heavy PDF like a scanned document or a photo-filled report, 50-75% reduction is typical.
Using Google Drive to Reduce Size
Google Drive has an indirect path to compression. Upload the PDF to Drive, open it with Google Docs (which converts it to a Docs document), then download it back as a PDF via File โ Download โ PDF Document. The round-trip through Google's PDF renderer often produces a smaller file than the original, particularly for documents with unoptimized images. The tradeoff is some loss of formatting fidelity, especially for complex layouts, so this works best for simple text documents.
Print to PDF as a Compression Workaround
On Android, opening a PDF in Chrome and using Chrome's Print function (three-dot menu โ Print โ Save as PDF) re-renders the document and often produces a smaller file. The reduction is unpredictable โ sometimes significant, sometimes minimal โ and quality can suffer if Chrome rasterizes vector content during the print process. It's worth trying as a quick option, but check the output quality before relying on it.
Adobe Acrobat App for Android
Adobe's Acrobat app for Android includes a Compress PDF feature, but it requires an Acrobat subscription to use. The free tier of the app provides viewing and basic annotation but gates compression behind the paid plan. If you already have an Acrobat subscription for other reasons, the Android app's compression is reliable and produces good quality output with control over the compression level. If you don't, the browser tool is the better route.
Sharing the Compressed File
After downloading the compressed PDF, open it from your Downloads folder or notification tray to verify quality โ zoom into any image-heavy pages to confirm they still look acceptable at normal viewing size. From there, share it directly via Gmail, WhatsApp, or any other app using the standard Android share function. The compressed file is a separate download from the original, so your original PDF remains unchanged in case you need to go back to it.