Free Caesar cipher encoder, decoder and solver, with classical cipher tools and cryptography guides.
Caesar cipher encoder, decoder and shift controls
Overview
What is Caesar Cipher?
Free classical cipher encoders, decoders and cryptography guides
CaesarCipher.org provides free browser-based classical cipher tools and educational guides. Students, teachers and puzzle enthusiasts can encode and decode Caesar, Vigenere, Atbash, Playfair and other historical ciphers.
The Caesar cipher tool supports choosing a shift and exploring letter mappings. The decoder tests all 25 possible shifts for ciphertext with an unknown key. A cipher identifier helps users narrow down possible classical cipher types.
Worked examples, formulas and step-by-step explanations support learning. Tools run locally in the browser and require no signup.
Platforms and languages
Caesar Cipher Availability
Platforms
Languages
Capabilities
Caesar Cipher Key Features
Caesar cipher encoder, decoder and solver
Encode and decode text with a chosen alphabet shift, or test all 25 Caesar shifts to solve ciphertext without a known key. Includes worked examples for learning.
Plans and access
Caesar Cipher Pricing
Free
All tools are free to use with no signup or usage limits. Some pages display advertisements.
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