Caesar Cipher

Encode and decode text with the classic Caesar shift cipher. Choose any shift from 1 to 25, switch between encode and decode, and convert messages instantly in your browser. Letters keep their case and everything else is preserved.

Built for caesar cipher workflows and closely related tasks like caesar cipher decoder.

Enter text

13 chars2 words

Options

Mode

Shift amount (1-25)

Cipher outputLive preview

Khoor, Zruog!

Ctrl+Enter to copy | Ctrl+Z to undo

Example usage

Example input

Hello, World!

Example output

Khoor, Zruog!

Batch Processing

Enter multiple inputs, one per line. Each line will be processed separately.

Input (one per line)

Results

Why this tool?

All tools run entirely in your browser no uploads, no tracking.. All processing happens in your browser so no text ever leaves your device.

Quick tips

•Outputs update live as you type.
•Use the sticky copy button to grab results quickly.
•Bookmark this page for fast access.

encoding cluster

Explore the full tool family, supporting guides, and priority pages around this workflow.

Explore all related tools

How it works

Type or paste the text you want to encode or decode.
Set the shift amount — every letter moves that many positions through the alphabet.
Switch to decode and use the same shift to recover the original message.

Use cases

Solve and create Caesar cipher puzzles and escape-room clues.

Teach the basics of substitution ciphers in classrooms.

Decode shifted messages shared in games and CTF challenges.

Experiment with how shift values change the output.

Encoding

Explore all encoding and decoding tools

Jump back to the cluster hub to browse the full tool family, the strongest money pages, and the supporting guides tied to this workflow.

Browse Encoding

Related tools in this cluster

Numbers to Letters Converter

Use this numbers to letters calculator to decode 1-26 into A-Z instantly. This A1Z26 decoder converts sequences like 20 5 24 20 into TEXT for ciphers, puzzles, games, and classroom activities.

Letters to Numbers Converter

Map letters A-Z to numbers 1-26 instantly. This letter to number translator uses the A1Z26 cipher to transform alphabetical characters into their corresponding numeric positions. Convert words to numbers by mapping each letter to its alphabet position (A=1, B=2, C=3, etc.).

Text to Hex

Convert text to hexadecimal values using UTF-8 encoding. This Text to Hex converter transforms plain text into hexadecimal representation using 8-bit ASCII encoding for each character.

Hex to Text

Decode hexadecimal values back into readable text instantly. This Hex to Text converter reads byte pairs and converts them back to UTF-8 text for debugging, learning, and data inspection.

Text to Binary

Turn text into binary bytes instantly using 8-bit ASCII encoding. Convert letters to binary online with our free tool. This Text to Binary converter is useful for learning, debugging, and working with binary representations of text.

Text to Base64

Encode text into Base64 safely. This Text to Base64 converter transforms plain text into Base64-encoded strings using UTF-8 encoding for secure data transmission.

Supporting guides

Numbers to Letters Calculator Explained

Learn how A1Z26 decoding works, which separators to use, and how to turn number strings into readable words quickly.

Text to Hex: Fast UTF-8 Examples for Developers

Understand how text maps to bytes and hex values with clear UTF-8 examples you can copy and test.

Conversion History

FAQ

What is a Caesar cipher?

A Caesar cipher shifts every letter a fixed number of places through the alphabet. A shift of 3 turns A into D, B into E, and so on, wrapping around from Z back to A.

How do I decode a Caesar cipher?

Switch the mode to decode and enter the same shift that was used to encode it. The tool reverses the shift and returns the original text.

What if I do not know the shift?

Try each shift from 1 to 25 — there are only 25 possibilities, so you can quickly scan for the one that produces readable text.