Use it for cryptography, data validation, typography checks and simple text statistics. Options let you ignore case, ignore whitespace or restrict the analysis to letters only. Everything runs locally.
Calculator
How to use the Character Frequency Counter
- Paste the text you want to analyse.
- Choose whether to ignore case, ignore whitespace or restrict to letters.
- Read the sorted frequency table with counts, percentages and bars.
- Check the entropy figure for a single-number summary.
About this tool
The Character Frequency Counter is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Frequency analysis for classical cipher puzzles.
- Checking character distribution in generated data.
- Validating that a text file uses the expected encoding.
- Comparing typographic balance between two drafts.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
What does the entropy number mean?
Shannon entropy in bits per character. Random data over 26 letters is about 4.7 bits; natural English is closer to 4.2 because some letters are far more common than others.
Can I see more than 30 characters?
The table shows the 30 most frequent, which covers every character in normal text. Rare symbols below that are omitted for readability.
Related tools you may like
Word CounterText · The Word Counter analyses whatever you paste and updates every statistic as you type: tota…Text To ASCII ConverterText · The Text To ASCII Converter translates in both directions. Enter normal text and receive t…Syllable Counter For English TextText · English syllable counting is famously irregular - "fire" is one syllable, "hour" is one, "…Reverse Text GeneratorText · The Reverse Text Generator flips text in four different ways: reverse every character (inc…Line Break RemoverText · Pasted text is rarely paste-ready. Copy a column from a spreadsheet or a wrapped paragraph…Remove Duplicate Lines ToolText · The Remove Duplicate Lines Tool cleans messy lists. Paste a column of emails, keywords, ID…Investment Return CalculatorFinance · The Investment Return Calculator converts what you put in and what you have now into the n…Deck Material EstimatorHome · A deck is mostly lumber, fasteners and concrete, and getting the order right saves a retur…