# Cryptool

> Cryptography for humans - Encryption, Passwords, LAN, SMS, Offline, Light

Canonical page: [https://chrome-stats.com/d/io.github.nfdz.cryptool](https://chrome-stats.com/d/io.github.nfdz.cryptool)

## Overview

- **ID:** `io.github.nfdz.cryptool`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** nfdz
- **Category:** TOOLS
- **Downloads:** 69,700
- **Rating:** 4.05 / 5 (258 ratings)
- **Version:** 3.2.3
- **Last updated:** 2025-08-23
- **First published:** 2017-10-28
- **Publisher country:** ES
- **Size:** 16 MB
- **Data as of:** 2026-09-13
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=io.github.nfdz.cryptool)
- **Website:** [https://github.com/nfdz/Cryptool](https://github.com/nfdz/Cryptool)
- **Privacy policy:** [https://github.com/nfdz/Cryptool/blob/master/PRIVACY.md](https://github.com/nfdz/Cryptool/blob/master/PRIVACY.md)

## Description

Cryptool is an open-source, non-profit encryption app designed to help users securely protect their most important information. With a focus on transparency, it reveals encryption algorithms and data input/output, allowing users to verify and even build the app themselves.

This lightweight tool offers a modern Material You UI with light/dark theme support. It supports multiple encryption conversations and message sources like manual input, LAN communication, file syncing, and SMS. Additional features include a keystore, multiple algorithms, clipboard control, data import/export options, and robust access code protection including biometric ID. Cryptool ensures easy, interoperable encryption that you can trust without compromising your privacy.

## Rankings

- #259,791 — Overall

## Permissions and access

### Permissions

- `android.permission.ACCESS_NETWORK_STATE`
- `android.permission.INTERNET`
- `android.permission.SYSTEM_ALERT_WINDOW`
- `android.permission.USE_BIOMETRIC`
- `android.permission.USE_FINGERPRINT`
- `io.github.nfdz.cryptool.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION`

## Review summary

Users appreciate Cryptool for its strong privacy focus, user-friendly interface, and effective encryption without producing long strings. Security enhancements are valued, and the tool is highly recommended. However, multiple users mention difficulty decoding messages, lack of an onboarding guide for new users, occasional slowness, and some dissatisfaction with interface updates. Overall, it is regarded as a great cryptography app with room for improvement in usability and performance.

### Pros

- Easy to understand and use with a well-designed UI.
- Effective cryptography tool that does not generate unnecessarily long strings.
- Focuses on privacy and security features, including improvements like bypassing Android Clipboard for enhanced security.
- Highly recommended by users for its functionality and design.

### Cons

- Difficult to read and decode received messages within the app.
- Lack of guidance or tutorial for first-time users.
- Somewhat slow performance and specific issues with algorithms like RC4.
- Interface changes that some users did not prefer compared to previous versions.

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Source: [Chrome-Stats](https://chrome-stats.com/d/io.github.nfdz.cryptool)