Caesar / ROT13
Shift-cipher encode and decode.
Runs in your browserFree — no signup
How to use Caesar / ROT13
Caesar / ROT13 lets you shift-cipher encode and decode instantly, with no install and no round-trip to a server — useful when you're pasting data you'd rather not send anywhere.
Step by step
- 1Paste your text or data into the input box.
- 2Set any options the tool offers.
- 3The output updates as you type — no submit button needed for most tools.
- 4Copy the result, or download it as a file.
What to expect
- Instant results, even on large inputs.
- Clear error messages when the input is malformed (bad JSON, wrong encoding, etc.).
- Nothing is logged, so this is safe for tokens, keys and internal data.
Common use cases
- Debugging an API payload or config file.
- Cleaning up data pasted out of a spreadsheet, email or log.
- Quick checks during development without opening an IDE.
- Preparing content for a CMS, form or import job.
Privacy & data
Everything runs locally in your browser. Your file is never uploaded to a server, so nothing leaves your device.
Frequently asked questions
Related tools — send your output onward