# lock and unlock pdf - pdfsmith — Add, Remove password to PDF

> Add, Remove password to PDF (iPhone/iPad app by Nikhil Reddy Avuthu.)

- Source: https://appshunter.io/ios/app/lock-and-unlock-pdf-pdfsmith/id6757205450 (this page in markdown: same URL + `.md`)
- Developer: [Nikhil Reddy Avuthu](https://appshunter.io/developer/1805375286)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 14.0 · 23 MB
- Languages: American English
- Released: 2026-01-05
- Data updated: 2026-08-24
- User reviews in markdown: https://appshunter.io/ios/app/lock-and-unlock-pdf-pdfsmith/id6757205450/reviews.md

## What is lock and unlock pdf?

Secure your documents with confidence using PDFSmith, a fast and privacy-first PDF security tool that lets you lock PDFs, unlock PDFs, add passwords, remove password protection, and change PDF passwords — all fully offline on your device.

No uploads. No cloud processing. Your files never leave your phone.

Unlock Password-Protected PDFs

Remove password protection from PDFs when you know the correct password

Instantly unlock PDFs for viewing, editing, or sharing

Password is required — PDFSmith does not bypass or crack encryption

Lock PDFs with a Password

Add a password to unprotected PDF files

Secure sensitive documents before sharing

Protect PDFs instantly with strong encryption


Fast, Offline & On-Device

100% offline PDF processing

No internet connection required

Instant results with no waiting


Privacy-First by Design

Files are processed entirely on your device

No uploads to servers

No data collection or tracking


Save & Share Easily

Save locked or unlocked PDFs instantly

Share securely using your device’s share options


Perfect For

Professionals handling confidential documents

Students and educators

Travelers and offline environments

Anyone who values privacy and control


Key Features

Lock PDF with password

Unlock PDF with password

Add password to PDF

Remove password from PDF (password required)

Offline PDF security

On-device PDF processing

PDFSmith delivers professional-grade PDF security — fast, private, and completely under your control.


## Version history (last 4 releases)

### 1.2.6 — 2026-08-23

Added support for bulk/multi operations
UI Improvements

### 1.2.4 — 2026-03-16

Bug Fixes

### 1.2 — 2026-01-07

Added share intents
improved user experience

### 1.0 — 2026-01-06

No release notes.

## Apps similar to lock and unlock pdf

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [PDF Password Tool](https://appshunter.io/ios/app/pdf-password-tool/id6773886649) | — | Free | Utilities |
| [lock pdf \| unlock pdf expert](https://appshunter.io/ios/app/lock-pdf-unlock-pdf-expert/id6749227930) | — | Free | Utilities |
| [FaceGuard](https://appshunter.io/ios/app/faceguard/id1113526573) | — | Free | Utilities |
| [Unlock PDF – Password Remover](https://appshunter.io/ios/app/unlock-pdf-password-remover/id6779644571) | — | Free | Utilities |
| [Torchify: Bright LED Torch](https://appshunter.io/ios/app/torchify-bright-led-torch/id6756586775) | — | Free | Utilities |
| [Oh My NFC](https://appshunter.io/ios/app/oh-my-nfc/id6758503285) | — | Free | Utilities |

## More apps by Nikhil Reddy Avuthu

- [Vatti - Interest Calculator](https://appshunter.io/ios/app/vatti-interest-calculator/id6743965453)
- [Pytonic - Python 3 Interpreter](https://appshunter.io/ios/app/pytonic-python-3-interpreter/id6743980111)
- [Resume Maker 9000 - PDF CVs](https://appshunter.io/ios/app/resume-maker-9000-pdf-cvs/id6745529858)
- [Cash Counter Totals Calculator](https://appshunter.io/ios/app/cash-counter-totals-calculator/id6758898081)
- [Telugu speech to text - Veena](https://appshunter.io/ios/app/telugu-speech-to-text-veena/id6769981675)

All apps by Nikhil Reddy Avuthu: https://appshunter.io/developer/1805375286

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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 2026-08-24.*