Automatic Caesar Breaker

Crack Caesar ciphers instantly using English frequency analysis. No key required.

Current Shift:

Analysis of All Shifts

Shift Entropy Preview

Examples

Common Caesar (Shift 13)

Decrypts "Common Caesar cipher example" (ROT13).

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Shift 3 (A -> D)

Classic sentence shifted by 3.

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Harder Example

Another variation of the fox sentence.

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How It Works

This tool tries every possible shift (0-25) and calculates the "Entropy" of the result based on English letter frequencies. The lower the entropy, the more likely the result is valid English text.

Auto-Detection
Instant Results
Secure (Client-side)