How to Compress a PDF on iPhone and iPad
PDF too large to share from your iPhone? Learn how to reduce PDF file size directly on iOS using built-in tools and free apps — no computer needed.
Can You Compress a PDF on iPhone?
Yes — and you do not need a computer. iOS provides several ways to reduce PDF file size, from using Safari to visit an online converter, to the built-in Files app, to a custom Shortcut that compresses PDFs with a single tap.
Method 1: ToolsofPDF in Safari (Easiest)
Any online PDF compressor works directly in Safari on iPhone:
- Open Safari on your iPhone
- Go to toolsofpdf.com/compress-pdf
- Tap Choose File and navigate to your PDF in Files or iCloud
- Select compression level (Medium is usually best)
- Tap Compress PDF
- Tap Download — the file saves to Downloads or iCloud Drive
Best for: Quick one-off compressions without installing any app.
Method 2: Print to PDF via Reduce File Size (iOS 16+)
iOS has a hidden compression path via the Print menu:
- Open the PDF in the Files app (or any PDF viewer)
- Tap the Share icon
- Tap Print
- In the Print dialog, pinch outward on the preview thumbnail
- Tap Share again from the new full-screen preview
- Tap Save to Files
The newly saved file passes through iOS's print engine and is often 10–30% smaller. Not as powerful as a dedicated compressor, but requires nothing extra.
Method 3: iPhone Shortcuts App
Create a one-tap PDF compression workflow:
- Open Shortcuts app
- Tap + to create a new shortcut
- Add action: Get File
- Add action: Make PDF — set quality to Medium
- Add action: Save File
Run the shortcut, select your PDF, and the compressed version saves automatically. Search the Shortcuts Gallery for "Compress PDF" for community-created versions.
Method 4: Adobe Acrobat for iOS (Free)
- Download Adobe Acrobat: PDF Edit & Sign from the App Store
- Open your PDF in the app
- Tap the Tools icon
- Tap Compress PDF
- Choose quality level and tap Compress
Integrates with iCloud Drive, Dropbox, and Google Drive for easy access.
Compression Results on iPhone
| PDF type | Typical reduction |
|---|---|
| Scanned document (high DPI) | 60–85% smaller |
| Photo-heavy report | 40–60% smaller |
| Text-only document | 10–20% smaller |
| Already-optimised PDF | 5–10% smaller |
Tips
Check sizes before and after: In the Files app, tap-hold any file → Info to see size. Verify the compressed version is actually smaller.
iCloud syncs automatically: Compressed files in iCloud Drive sync to all your Apple devices.
Watch for duplicates: After compressing, you may have both the original and compressed version — delete the original if no longer needed.
Sharing the Compressed PDF
From Files: tap-hold → Share → choose Mail, Messages, AirDrop, WhatsApp, etc.
Frequently Asked Questions
Can I compress without internet? Yes — use the Shortcuts method or Adobe Acrobat for iOS, which process locally. The Safari/ToolsofPDF method requires internet.
Can I compress multiple PDFs at once? The Shortcuts method can be adapted for batch processing. For bulk compression, a desktop is more efficient.
The PDF is password-protected — can I compress it? Enter the password to open the file first. Most tools will then let you compress the unlocked content.
Summary
Compressing a PDF on iPhone is quick with ToolsofPDF in Safari — no app install needed. For a built-in iOS approach, the Print → pinch-out → Save trick provides moderate compression. Adobe Acrobat for iOS offers dedicated compression with quality control. For repeated use, create an iPhone Shortcut to automate the process.