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Obfuscate Text

Apply ROT13 to letters, hiding text from a casual glance but not from anyone determined.

Browser onlyYour data never leaves this device.

Runs entirely in your browser. Your text never leaves this device and is never stored.

Details: Privacy policy

Input

ROT13 is its own inverse. Nothing is stored.

Result

No text yet.

Paste text above to apply ROT13.

Obfuscate Text applies ROT13, the fixed thirteen-place rotation of the Latin alphabet. Applying it twice restores the original, which is why the same page both hides and reveals: there is no key and no state, only a rotation. It is useful for spoilers, puzzle answers and a quick visual barrier against a casual glance, and it is useless against anyone who knows the convention or recognises the output. The page states that clearly. Only the twenty-six ASCII letters rotate; digits, punctuation, accented letters and non-Latin scripts pass through unchanged, so mixed text is only partly hidden. The result reports how many letters were rotated. It is not encryption, not a password tool and not a way to protect sensitive data. It is the tool for hiding a punchline in a forum post, preparing a light puzzle, and demonstrating why a keyless substitution is not confidentiality. The rotation preserves word length and punctuation, so the shape of a sentence remains visible even when the letters do not; that is enough to tease a puzzle without making the text unreadable for long. Because there is no key, nothing about the output depends on a secret, and a reader who recognises the pattern can undo it in one step. ROT13 is a substitution, so letter frequency is preserved and the text is not statistically hidden. The page does not add or remove spaces. The output has the same length as the input. Punctuation and spacing stay exactly where they were.

How to use Obfuscate Text

  1. Paste the text to obfuscate.
  2. Read the rotated output and the letter count.
  3. Copy the result or clear to start over.

What you get

  • The text with ASCII letters rotated by thirteen places.
  • A count of letters that were rotated.
  • Digits, punctuation and non-Latin scripts preserved exactly.

When to use Obfuscate Text

  • Hide a spoiler or punchline from a casual glance.
  • Prepare a simple ROT13 puzzle answer.
  • Demonstrate that a keyless substitution is not encryption.

Frequently asked questions about Obfuscate Text

Can I undo it?

Yes. ROT13 is its own inverse, so applying it again restores the original.

Is this encryption?

No. There is no key; anyone who knows ROT13 can read it immediately.

Why are some characters unchanged?

Only ASCII letters rotate; digits, punctuation, accents and other scripts are left alone.

Is my text uploaded?

No. Rotation runs in your browser; nothing is sent to a server or stored.

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