ROT13
ROT13 ("rotate by 13 places") is a simple letter-substitution cipher that replaces each letter with the one 13 positions later in the alphabet. Since the Latin alphabet has 26 letters, applying ROT13 twice gives the original text — it's its own inverse. Useful for hiding spoilers or puzzle answers. Runs entirely in your browser.
Privacy
Runs entirely in your browser — nothing is sent to any server.
Cost
Free. No sign-up, no watermark.
Type
Cipher
Related tools
Tools that work with the same formats — most users open one of these next.
QR Code Reader
Scan a QR code from any image and decode it to text — free, online, runs entirely in your browser.
QR Code Generator
Generate a QR code from any text, URL or contact data — pick error correction and scale, get a PNG.
File to Hex Dump
Convert any file's bytes to a hex dump (with ASCII sidecar), plain hex, C array or comma-separated bytes.
Hex to Binary File
Parse a hex dump or hex string back into a binary file — strips offsets, ASCII columns, prefixes and separators automatically.
Wi-Fi QR Code Generator
Generate a Wi-Fi QR code as a PNG — scanning it auto-joins the network. Supports WPA / WEP / open networks and hidden SSIDs.
vCard QR Code Generator
Generate a QR code that contains a digital business card (vCard) — scanning it lets the phone save the contact in one tap.
Frequently asked
Is ROT13 free to use?
Yes. ROT13 is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.
Do my files and data stay private?
Yes — ROT13 runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How does ROT13 work?
Open ROT13, paste or fill in the input fields, and the result updates instantly. Everything runs in your browser — no upload, no waiting.
Which browsers does ROT13 support?
Any modern browser works — Chrome, Firefox, Safari, and Edge on desktop and mobile. ROT13 uses standard web APIs and does not require any plugin, extension, or sign-up.