Letter Frequency Analyzer (English, German, French, Spanish)

Letter frequency is the simplest cryptanalysis technique — for substitution ciphers, the most common letter in the ciphertext is often "e" if the language is English (~12.7%). This analyzer counts letters in your text and compares against published baselines for English, German, French, and Spanish.

How to use the Letter Frequency Analyzer (English, German, French, Spanish)

Paste text, pick a language baseline. Output shows letter frequency table with bars and deviation from baseline.