Shrink PDF file size on your phone without an app

1 min read·25 July 2026

Got a large PDF attachment to send on your phone? PDFrust's compression tool works in the mobile browser on both iPhone and Android — no app to install, no files uploaded to a server.

Compress on iPhone (Safari)

Open Safari on your iPhone and go to pdfrust.com. Tap the compress tool. Tap "Select file" — iOS opens a file picker. Navigate to your PDF in Files, iCloud Drive, or recent locations. Tap compress and save the smaller file.

Compress on Android (Chrome)

Open Chrome on your Android phone. Go to pdfrust.com and select the compress tool. Tap "Select file" and find your PDF in the Files app or Downloads. Tap compress and download the reduced file.

Compress PDF

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How much smaller can it get?

Mobile compression works identically to desktop — processing happens locally in the browser. PDFs with many images typically shrink 50–80%. Text-only documents with few images gain less.

Send via WhatsApp after compressing

WhatsApp has an attachment limit of 100 MB (documents) and 16 MB (media). After compression your PDF is usually well within limits. In WhatsApp, tap the paperclip, choose "Document," and select the compressed PDF from your downloads.