Letter Frequency Analyzer

Why Analyse Letter Frequency?

Every language has a characteristic letter distribution — in English, E and T appear far more often than Q or Z. This pattern is the foundation of classical cryptanalysis (frequency analysis can crack a simple substitution cipher), and it is also a staple exercise in linguistics and introductory programming courses. Our analyser counts every letter A–Z case-insensitively and ranks them from most to least common.

Features

• Full A–Z breakdown — count and percentage for every letter, with visual bars.
• Case-insensitive — uppercase and lowercase count as the same letter.
• Most / least frequent callouts — the extremes are highlighted automatically.
• Total letter count — non-letter characters are excluded from the analysis.

Common Use Cases

• Cryptanalysis and cipher-breaking exercises based on frequency analysis.
• Linguistics coursework comparing letter distributions across languages or texts.
• Classroom demonstrations of how English letter frequency underpins word games like Scrabble.