Character Frequency Analyzer

Letter and character frequency analysis for text

Character frequency analysis counts how often each symbol appears in a passage. Cryptographers use it to attack simple substitution ciphers; linguists compare distributions to standard English frequencies where E, T, and A dominate. Paste any string to see counts, percentages, and a bar chart, optionally case-sensitive or letters-only.

Workflow

1. Paste ciphertext, prose, or log lines into the editor.
2. Toggle case sensitivity when uppercase and lowercase must be counted separately.
3. Enable letters-only to ignore digits, spaces, and punctuation.
4. Compare the “English %” column to spot symbols that appear more or less often than typical English text.

For word-level statistics, use the Word Frequency Counter. To count Unicode code points and blocks, try the Count Unicode Characters tool.