ROT13 Uppercase Only
Applies ROT13 only to uppercase letters, leaving everything else intact. Free, instant and 100% private in your browser.
Encoders & Decoders Runs in your browser
What does ROT13 Uppercase Only do?
Applies ROT13 only to uppercase letters, leaving everything else intact. Paste your text on the left and NMSnabbit instantly shows the rot13 (a-z only) on the right. Everything runs locally in your browser — nothing is uploaded, so it stays private and works offline. You can process several values at once and copy the result with one click.
How to use the ROT13 Uppercase Only
- 1 Type or paste your text into the input box.
- 2 The rot13 (a-z only) appears instantly in the output box as you type.
- 3 Enter several values separated by spaces or new lines to process them at once.
- 4 Click “Copy output” to copy the result.
What you can use it for
- Quickly applies rot13 only to uppercase letters, leaving everything else intact without installing anything.
- Checking results while learning or teaching how text and rot13 (a-z only) relate.
- Preparing or debugging data for programming, electronics or homework.
- Working privately when the data shouldn't be uploaded to a server.
Frequently asked questions
How do I use ROT13 Uppercase Only?
Paste your text into the input field above. ROT13 Uppercase Only runs instantly in your browser and shows the rot13 (a-z only) on the right — no button to press and nothing uploaded.
Is ROT13 Uppercase Only free and private?
Yes. ROT13 Uppercase Only is completely free with no sign-up, and it runs entirely client-side in your browser, so your data never leaves your device.
Can I process more than one value at once?
Yes. Enter several values separated by spaces or new lines and each one is handled independently, so you can batch-process in a single pass.
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