One of the oldest substitution ciphers on record simply flips the alphabet end to end — A becomes Z, B becomes Y, and so on — with no key to remember at all. This tool encodes and decodes it instantly, and since it’s its own inverse, there’s only one button to press either way.
What Is the Atbash Cipher Tool?
Type any text and get back its Atbash-substituted version, where every letter is swapped with its mirror position in the alphabet. Because the transformation is symmetric, running the exact same tool a second time on the output restores your original text — no separate decrypt mode needed. A full A-Z mirror reference table is included for quick single-letter lookups.
How to Use It
- Open the tool at /tools/atbash-cipher.
- Type or paste your text.
- Read the mirrored result instantly.
- To decode an Atbash-encoded message, paste it back in — the same transformation reverses it.
Key Features
- Classic mirror-alphabet substitution, with no key required.
- Self-inverse operation — encoding twice returns the original text.
- Case-preserving output, keeping uppercase and lowercase letters distinguishable.
- Full mirror-alphabet reference table for quick single-letter lookups.
When to Use This Tool
- Solving word puzzles or escape-room style ciphers that use Atbash encoding.
- Learning the history of early substitution ciphers, including its origins in Hebrew scripture encoding.
- Simple text obfuscation for non-sensitive content (Atbash offers no real security).
Try It Now
Open Atbash Cipher Tool directly, or press ⌘K and type the tool name from anywhere on the site.
Part of the Security & Crypto collection on WebdevToolbox — free, browser-based developer tools with no login required.