Julius Caesar shifted letters to hide messages from messengers, and that five-century-old trick still works for its one real purpose today: keeping spoilers and punchlines hidden from passers-by on the internet.
Encode with ROT13 or any Caesar shift and decode again with the same key. It is fun, it is fast, and it is about as secure as a locked diary, which is exactly the job description for hiding a movie ending in a forum post.
Try it now: open the free tool, runs 100{ddff9936f8333f09603555df7bd6492034f3a4a35de784276d3cf3d66166a113} in your browser.
Bottom line: use it for spoilers, not secrets, Caesar shifts die in seconds.
Your turn: use the tool free here, no signup, nothing leaves your device.
How do you use ROT13 / Caesar Cipher?
Open the ROT13 / Caesar Cipher in your browser (Simple text encryption). Type or paste your input, adjust the options, and copy the result. Everything runs locally on your device with no account and nothing stored, so the three steps below take seconds even for confidential work.
- Paste the text you want to work with.
- Choose the transformation you need.
- Copy the result, or tweak the input to see it update live.
Try ROT13 / Caesar Cipher free. It opens right in your browser.