How is ROT47 different from ROT13?

ROT13 only rotates the 26 letters of the Latin alphabet, leaving digits and punctuation unchanged. ROT47 rotates all 94 printable ASCII characters (! through ~), so numbers and symbols are also transformed.

Why does applying ROT47 twice restore the original text?

The printable ASCII range contains exactly 94 characters. Shifting by 47 twice gives a total shift of 94, which completes a full cycle and returns each character to its original position.

What characters does ROT47 leave unchanged?

Spaces (ASCII 32), control characters (ASCII 0–31), DEL (ASCII 127), and any non-ASCII characters (codes above 127) are passed through without modification.

No. ROT47 is a simple substitution cipher and provides no cryptographic security. It is useful for casual obfuscation but is trivially reversible by anyone who recognizes the pattern.

Does this tool send my text to a server?

No. All processing happens entirely in your browser using JavaScript. Your text never leaves your device.

Can I use ROT47 on multi-line text?

Yes. Paste any multi-line text and every printable ASCII character on each line will be transformed. Newlines are left intact.

ROT47 Cipher

Name: ROT47 Cipher
Availability: InStock
Author: Nham Vu

Type or paste text to instantly encode or decode it with ROT47 — every printable ASCII character rotates by 47 positions.

Input Text

Characters

Lines

Chars shifted

ROT47 Output

Apply again to decode

Printable ASCII Range (! to ~)

ROT47 rotates characters in the range ! (33) to ~ (126) — all 94 printable ASCII characters. Spaces and non-ASCII text are unchanged.

Example: letters

A (65) → p (112)

a (97) → 2 (50)

z (122) → } (125)

Example: digits & symbols

0 (48) → _ (95)

! (33) → P (80)

~ (126) →] (93)

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Summary

Type or paste text to instantly encode or decode it with ROT47 — every printable ASCII character rotates by 47 positions.

How it works

Type or paste your text into the input field.
Each printable ASCII character (! through ~, codes 33–126) is shifted 47 positions forward within that range.
Characters that fall off the end of the range wrap back to the beginning.
Spaces, control characters, and non-ASCII text are passed through unchanged.
The result appears instantly in the output field — apply ROT47 again to decode.
Use the Copy or Download buttons to save the result.

Use cases

Obfuscate text that includes numbers, symbols, and letters — unlike ROT13, ROT47 transforms them all.
Hide spoilers or puzzle answers in a format that is still printable and pasteable.
Encode configuration strings for lightweight, non-security-critical obfuscation.
Decode ROT47-encoded content found in CTF challenges or developer examples.
Teach the concept of modular arithmetic and substitution ciphers.
Test whether a parser or renderer handles unusual but valid ASCII characters correctly.
Scramble code snippets or file names for demo environments.
Explore how ROT47 differs from ROT13 by comparing their outputs side by side.

Frequently Asked Questions

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Last updated: 2026-05-23 · Reviewed by Nham Vu