# PDF File Protector — PDF watermark&sign&password

> PDF watermark&sign&password (iPhone/iPad app by 乐祥 胡.)

- Source: https://appshunter.io/ios/app/pdf-file-protector/id6738285744 (this page in markdown: same URL + `.md`)
- Developer: [乐祥 胡](https://appshunter.io/developer/1572365721)
- Category: Utilities, Productivity
- Price: $19.99 with in-app purchases
- Age rating: 4+
- Requires: iOS 16.6 · 7 MB
- Languages: American English, Japanese, Chinese (Simplified, China)
- Released: 2024-11-16
- Data updated: 2026-08-19
- User reviews in markdown: https://appshunter.io/ios/app/pdf-file-protector/id6738285744/reviews.md

## What is PDF File Protector?

Worried about sensitive PDFs being shared freely or leaked? Want to add a unique identifier to your important documents? 
PDF File Protector is your professional document security assistant! 
Safeguard your document security and copyright comprehensively with powerful watermarking, signing, and encryption features.

[All-in-One Core Features]
• Effortless Watermarking

Add text or image watermarks with customizable content, size, opacity, and rotation.
Stamp exclusive identifiers on contracts, designs, or internal materials to prevent unauthorized use and distribution, asserting your ownership.
• Secure E-Signature

Support for direct handwritten signatures, placed precisely anywhere in the document.
Perfect for approving contracts, confirming orders, or signing agreements—get it done quickly without the hassle of printing and scanning.
• Powerful PDF Encryption

Set a high-strength password to open the PDF, preventing unauthorized access.
Effectively prevents data leaks caused by device loss or accidental file sharing, locking down your privacy and trade secrets.
[App Highlights]
Simple Operation: No expertise needed. Professional-level protection is just a few taps away.
Fully Offline: All processing is done locally on your device. Your files are never uploaded, guaranteeing privacy and security.
High-Quality Output: Maintains the original file's clarity and quality without compromising the reading experience.

Perfect For:

Business Professionals: Protect confidential company reports and contract documents.
Designers/Creators: Add copyright watermarks to portfolios and design drafts.
General Users: Encrypt important personal documents like IDs, resumes, and bank statements.
Download PDF File Protector today! Hold professional-grade security measures in the palm of your hand. Share files with peace of mind!

## Pricing and in-app purchases

Base price: $19.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| pdf签名内购 | $9.99 | one-time |



## Version history (last 5 releases)

### 1.1.10 — 2026-08-14

Fixed splash screen black screen issue.
Fixed duplicate signature bug caused by signature arrow adjustment.
Added Y‑axis offset configuration for watermark settings.

### 1.1.9 — 2026-05-30

Bug fixes and performance improvements

### 1.1.8 — 2025-12-30

update ui

### 1.1.7 — 2025-11-02

add feedback entry

### 1.1.6 — 2025-06-28

update pricavy

## More apps by 乐祥 胡

- [厦门地铁助手](https://appshunter.io/ios/app/id6736643380)
- [济南地铁助手](https://appshunter.io/ios/app/id6736646083)
- [东莞地铁助手](https://appshunter.io/ios/app/id6736825923)
- [上海地铁助手](https://appshunter.io/ios/app/id6736857821)
- [广州地铁助手](https://appshunter.io/ios/app/id6736858136)
- [长春地铁助手](https://appshunter.io/ios/app/id6736858566)

All apps by 乐祥 胡: https://appshunter.io/developer/1572365721

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-19.*