ROT13 Encoder / Decoder
Encode or decode text with ROT13, ROT5, ROT18, ROT47 or any Caesar shift.
ROT13, ROT5, ROT18 and ROT47 are their own inverse: applying them twice gives back the original. They hide spoilers and puzzle answers but are not encryption.
Processing and privacy
Processing varies by tool. Check the instructions for local processing, server requests, external services and any file or request limits before entering sensitive information.
Read the privacy policyShare this tool
Found it useful? Send it to a friend or teammate.
Rate this tool
0.0
0 ratings
- 5 stars 0
- 4 stars 0
- 3 stars 0
- 2 stars 0
- 1 star 0
Clear instructions
Find steps, examples and limitations below.
Use online
Open the tool in a supported web browser.
Free to use
No sign-up required. Tool-specific limits may apply.
How to use the ROT13 Encoder / Decoder
Encode or decode text with ROT13, ROT5, ROT18, ROT47 or any Caesar shift.
- 1 Choose the cipher: ROT13, ROT5, ROT18, ROT47 or Caesar.
- 2 Type or paste your text; the result appears instantly.
- 3 For Caesar, set the shift, or click the readable line in the list of all 25 shifts.
Example and practical tips
“Hello” in ROT13 is “Uryyb”, and applying ROT13 again gives “Hello” back. Puzzle forums use it to hide spoilers.
Frequently asked questions
Is ROT13 encryption?
No. It is a simple letter substitution anyone can reverse, useful only for hiding spoilers and puzzle answers.
What is ROT47?
ROT47 rotates all printable ASCII characters, including digits and punctuation, by 47 places.
Practical guides
-
How to Use ROT13 Encoder / Decoder
Encode or decode text with ROT13, ROT5, ROT18, ROT47 or a Caesar cipher with any shift, and try all 25 shifts to crack an unknown Caesar message.
Report an issue
Something broken or not quite right? Tell us and we will look into it.