ROT13 Encoder / Decoder
// Apply ROT13 cipher to text
ROT13 is its own inverse — encoding and decoding are the same operation.
#About ROT13 Encoder / Decoder
Free online ROT13 encoder and decoder. Apply the ROT13 substitution cipher to shift letters by 13 positions. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
#FAQ
What is ROT13? ▾
ROT13 is a simple substitution cipher that shifts each letter 13 positions in the alphabet. Since the alphabet has 26 letters, applying ROT13 twice returns the original text.
Is ROT13 secure? ▾
No. ROT13 provides no cryptographic security. It is used to obscure text (e.g., spoilers) rather than to protect secrets.
</> Embed this tool ▾
Copy this code to embed the tool on your website. Adjust the height to fit your layout.
<iframe src="https://www.browserutils.dev/embed/rot13-encoder" width="100%" height="500" frameborder="0" title="ROT13 Encoder / Decoder"></iframe>