Text Scrambler
Hide text with ROT13, Caesar shifts, Atbash, reversal or upside-down letters.
Hide Text From a Casual Glance
There is a genuine category of text you want unreadable at a glance but trivially readable on purpose: a spoiler, a puzzle answer, a punchline, an email address you would rather a scraper did not pick up. That is a different problem from secrecy, and it wants a different tool.
Everything here is a classical transformation — the ones people have been using since long before computers. They are all trivially breakable, which is stated plainly rather than dressed up, because using one of these for anything that actually needs protecting would be a mistake.
Key features
- Seven transformations — ROT13, a Caesar shift of any amount, Atbash, character reversal, word reversal, upside-down letters and interior scrambling.
- Most are their own inverse — ROT13 and Atbash undo themselves, so one button both hides and reveals.
- Send the output back — one click to feed a result back in, for chaining or for decoding.
- An explanation with each — what it does, whether it is reversible, and what it is good for.
- Stated limits — none of these is encryption, and the tool says so rather than implying otherwise.
This tool runs entirely inside your browser using native Web APIs. Your files and text are never uploaded to a server, never logged and never shared with third parties.
How to use: Text Scrambler
- Pick a transformation
ROT13 is the classic spoiler hider; reversal is the most obvious at a glance. - Type or paste your text
The output updates as you type. - Read the note
It tells you whether that transformation can be undone and how. - Copy the result
Or send it back to the input to chain another transformation onto it.
Technical specifications
| Processing location | Entirely in your browser — no server round trip |
|---|---|
| Data uploaded | None. Files and text never leave your device |
| Price | Free — no account, no trial, no usage cap |
| Category | Text |
| Works offline | Yes, once the page has loaded |
| Browser support | Chrome 90+, Edge 90+, Firefox 90+, Safari 15+ |
| Interface languages | English, 中文, हिन्दी, Español, العربية |
Frequently asked questions
Is any of this secure?
No, and none of it is meant to be. Every transformation here can be undone by anyone who recognises it, and ROT13 in particular is undone by running it again. For anything that genuinely needs protecting, use encryption — and never a scheme you found in a text tool.
Why is ROT13 so common for spoilers?
Because it is its own inverse and obviously scrambled. Readers who want the spoiler run it through and get the text; readers who do not see visible nonsense and skip past. It has been the convention on forums since Usenet.
What does "scramble interiors" do?
It keeps the first and last letter of each word and shuffles the middle. The text stays surprisingly readable, which is the point of the demonstration — but unlike the others it is not reversible, because the original letter order is gone.
Will upside-down text work everywhere?
It uses Unicode look-alike characters, so it depends on font coverage and renders as boxes where the font is missing them. Screen readers handle it badly too, so keep it to short strings.