ROT13 Encoder Decoder | ROT47 and ROT5 Tool

ROT13 encoder and decoder with ROT47, ROT5, ROT18 and any custom ROT-N shift. Encode or decode text as you type and see the letter mapping. Free, no signup.

Also known as: rot13 decoder · rot13 encoder online · rot13 translator · rot47 decoder · rot5 digits · rot18 converter · rot n cipher · rotate letters by 13

encoding and decoding tools

encryption tools

text tools

encoders

Rotation

letters shift 13, the classic

Text Input

ROT13 Output

Character Mapping

from	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O	P	Q	R	S	T	U	V	W	X	Y	Z
to	N	O	P	Q	R	S	T	U	V	W	X	Y	Z	A	B	C	D	E	F	G	H	I	J	K	L	M

This rotation is its own inverse: running the output through it again gives back the original text, so one button both encodes and decodes. Digits, spaces and punctuation pass through unchanged.

ROT13 hides text from a casual glance, not from anyone who wants to read it. Use it for spoilers, puzzle answers and test fixtures, never for passwords or anything that needs real encryption.

About ROT13 Encoder Decoder

ROT13 is used to hide spoilers, puzzle answers and email addresses from a casual read by rotating every letter 13 places. This tool encodes and decodes ROT13 as you type, and also handles ROT47 for full printable ASCII, ROT5 for digits, ROT18 for letters plus digits, and any custom ROT-N shift.

Key Features

Live ROT13 encoding and decoding with one button, since ROT13 is its own inverse
ROT47 rotates all 94 printable ASCII characters, so symbols and digits are hidden too
ROT5 and ROT18 for messages where the digits matter, such as times and gate numbers
Custom ROT-N with separate Encode and Decode for any shift from 1 to 25
A mapping table that shows exactly what each character becomes in the chosen mode
File upload and download, with everything processed in your browser

Use Cases

Hiding the answer to a riddle or a TV spoiler in a Reddit or Discord post
Decoding ROT13 text found in a CTF challenge, a geocache listing or an old Usenet thread
Generating obfuscated fixtures for unit tests that should not be readable at a glance
Teaching how substitution ciphers work before moving on to Caesar and Vigenere
Reversing ROT47 strings that hide punctuation, digits and letters together

Supported Formats

Plain text

TXT files

Markdown

Log files

Related Keywords

rot13 decoder

rot13 encoder online

rot13 translator

rot47 decoder

rot5 digits

rot18 converter

rot n cipher

rotate letters by 13

What is the difference between ROT13 and ROT47?

ROT13 shifts only the 26 letters by 13 places and leaves digits, spaces and symbols alone, so a message like 'Meet at 10:30' still shows its time. ROT47 shifts all 94 printable ASCII characters from ! to ~ by 47 places, so digits and punctuation are scrambled too. Both are their own inverse, and neither is encryption: anyone can reverse them in one step.

Privacy & Security

All processing happens locally in your browser. Your data never leaves your computer, ensuring complete privacy and security.

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Frequently asked questions

What is ROT13 Encoder Decoder used for?

ROT13 encoder and decoder with ROT47, ROT5, ROT18 and any custom ROT-N shift. Encode or decode text as you type and see the letter mapping. Free, no signup.

Is ROT13 Encoder Decoder free to use?

Yes. ROT13 Encoder Decoder is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use ROT13 Encoder Decoder?

No. ROT13 Encoder Decoder works immediately in your browser with no signup, login, or email address required.

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