ROT13 & Caesar Cipher
Rotate letters by any shift
Free forever — no sign-up, nothing uploaded. Files never leave your device.
ROT13 & Caesar Cipher
Rotate letters by any shift
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Browse filesdocument.pdf
1.2 MB
report.pdf
860 KB
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About this tool
Apply ROT13 or any Caesar shift to text, with an optional ROT47 mode for the full printable ASCII range.
The BrainCoder ROT13 & Caesar Cipher tool applies classic letter substitution ciphers to any text. ROT13 shifts every letter by 13 positions in the alphabet — so A becomes N, B becomes O, and so on. Apply it twice and you get back the original text, making it its own inverse. The Caesar cipher extends this concept with configurable shift values from 1 to 25.
While these ciphers are not secure by modern standards, they remain useful for hiding spoilers in forum posts, obfuscating text in puzzles and games, teaching the fundamentals of cryptography, and quick text scrambling. Our tool lets you adjust the shift value dynamically and supports both uppercase and lowercase letters while preserving numbers, spaces, and punctuation.
This is a fun, educational tool that runs entirely in your browser. No data is transmitted — just enter your text, pick a shift value, and see the result instantly. It's a great starting point for anyone learning about encryption and decryption.
Key features
Everything you get with ROT13 & Caesar Cipher — no premium upsell.
ROT13 with one-click toggle
Caesar cipher with configurable shift (1-25)
Preserves case, numbers, punctuation, and whitespace
Real-time conversion as you type or adjust shift
One-click copy for output text
Client-side processing — no data leaves your browser
How to use ROT13 & Caesar Cipher
Follow the steps below to use the tool.
- 1
Enter your text
Type or paste the text you want to encrypt or decrypt into the input area. Any text works — letters, numbers, symbols, and spaces.
- 2
Select cipher mode
Choose ROT13 for the classic 13-position shift, or select the Caesar cipher and adjust the shift value slider to your desired offset (1-25).
- 3
View the result
The output updates in real time showing the encrypted (or decrypted) text. Letters are shifted; all other characters remain unchanged.
- 4
Copy the output
Click the copy button to grab the ciphered text and share it in a forum post, puzzle, or educational exercise.
Still free, still private — your files never leave your device.
Launch ROT13 & Caesar CipherFrequently asked questions
Quick answers before you launch the tool.
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