Caesar cipher - De-/Encryption

235 reviews
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About this app

The app allows you to encrypt or decrypt text with the simple and widely known Caesar cipher. If you have an caesar encrypted text with a unknown key, the application can decrypt the text for you! This might be useful for riddles or geocaching. Furthermore, the algorithm is visualized with an interactive cipher disk which you can export and print to craft your own paper cipher disk.

The cipher is named after the famous roman dictator Gaius Julius Caesar.
It works with a simple substitution mechanism where each letter is replaced by another letter in the alphabet. For example with a right shift of 5 an "A" is replaced with an "F".

Decrypt me: Drkxu iye pyb ecsxq yeb kzz ❤

The algorithm is very simple and only serves to understand the theory behind encryption methods. Encrypted texts can be decrypted by anyone without much effort. Please do not use the app for sensitive information or texts that you want to protect from third parties.

➢ Features:
• caesar wheel (Cipher disk)
• custom alphabet
• suitable for geocaching
• educational animation
• automatic decryption in a few milliseconds
• multi-language support
• simple user interface
• share function
• export cipher disk
• context menu integration
• no ads
• 100 % FREE

➢ Permission is required to save cipher disk

➢ Supported decryption languages:
• Dansk
• Deutsch (Deutschland)
• Deutsch (Swiss)
• English (General)
• English (UK)
• English (USA)
• Español
• Français
• Italiano
• Nederlandse taal
• Norsk
Updated on
Nov 2, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection

Ratings and reviews

222 reviews
JanovicHero RFM
May 26, 2021
Its is a good app.. because its good when you as receiver got an unknown Key for Chiper text..It can auto find plain text base on Key (shift 1-25). Updated : Pop out up shift key doesnt work anymore. You need to manual search all key( 1-25) because the decrypt its self cant be done..from 5 star to 3 star..
10 people found this review helpful
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Philipp Kutsch
May 26, 2021
Hi, the decryption is dictionary-based. If the input text is not a correct sentence, or the language is different from your device language, the key may not be found. If you already know the language of the encrypted text, you can change the language of the automatic decryption in the settings. If you have any other questions, let me know. ~Philipp
Chris Hetherington
January 22, 2021
Great app, would be cool if you could customize the alphabet for the inner and outer rings individually. Even without that, this is a really neat app. With good procedures, this can create a really secure cipher.
13 people found this review helpful
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Coraliel Améliane