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Password Protect PDF

Password protect PDF files with AES encryption on your phone. Free PDF encryption app for iOS and Android.

📱 App Store — Free 🤖 Google Play — Free

How to Password Protect PDF on your phone

Download PDF Tools free from App Store or Google Play
Open the app and tap Password Protect PDF
Select your files and configure options
Tap the action button — done in seconds
Share, save or export your result

No account required. No watermarks. Works 100% offline.

Why PDF Tools for Password Protect PDF?

✅ 100% free — no subscription, no hidden fees
✅ No watermarks on your documents
✅ Works offline — files never leave your device
✅ Available on iPhone, iPad and Android
✅ Part of a 20+ tool PDF suite