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YFT
Client-side ProcessingUpdated 2026-02-11Report issue

Runs fully in your browser. Inputs stay on your device. See recent fixes on changelog.

ROT13 Encoder/Decoder

Encode and decode text using ROT13 letter substitution.

FreeRuns in browserrot13rot13 encoder

ROT13 is its own inverse: encoding and decoding use the same operation.

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Cmd/Ctrl+Enter Primary actionCmd/Ctrl+Shift+L Load sampleCmd/Ctrl+Shift+X Clear/resetCmd/Ctrl+Shift+C Copy result

About ROT13 Encoder/Decoder

Encode and decode text using ROT13 letter substitution. Encode and decode ROT13 text online for free. Apply the classic letter substitution cipher that shifts each letter 13 positions in the alphabet. No signup needed. Implements standard encoding and decoding algorithms that produce output compatible with all major programming languages and platforms. Supports both encoding and decoding in a single interface. Everything runs client-side in your browser for maximum speed and privacy — no data is sent to any server, and no signup is required.

Related tools: Morse Code Translator, Text to Binary Converter, Text Reverser

How to Use ROT13 Encoder/Decoder

  1. Enter text or data in the input field.
  2. Click Encode or Decode depending on your goal.
  3. Copy the output to your clipboard.

Frequently Asked Questions

What is ROT13 Encoder/Decoder?
Encode and decode ROT13 text online for free. Apply the classic letter substitution cipher that shifts each letter 13 positions in the alphabet. No signup needed.
What encoding standards are used?
This tool follows the official encoding specifications, including RFC standards where applicable. The implementation matches widely-used libraries so the output is compatible with other systems and programming languages.
Can I encode binary data?
The tool primarily handles text input, but many encoding formats such as Base64 are designed to represent binary data as text. You can paste Base64-encoded binary data for decoding or encode text into a binary-safe format.
Is the encoding reversible?
Yes, all encoding operations provided by this tool are fully reversible. You can encode text and then decode it back to get the exact original content without any data loss.
Is ROT13 Encoder/Decoder free to use?
Yes, encoding and decoding are completely free with no usage limits. The tool runs in your browser and requires no registration.
Is my data safe when using ROT13 Encoder/Decoder?
Yes, all encoding and decoding happens locally in your browser. No data leaves your device, so your input remains completely private.

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