What is frequency analysis used for?

Frequency analysis is a classic cryptanalysis technique: by comparing character frequencies in ciphertext to known language frequencies, you can identify substitution ciphers.

Can I ignore spaces and punctuation?

Yes — toggle the 'Exclude spaces' and 'Exclude punctuation' switches to focus only on letters and digits.

Is the analysis case-sensitive?

By default it is case-insensitive (A and a are counted together). Turn on the 'Case-sensitive' toggle to treat them separately.

How are percentages calculated?

Each character's percentage is its count divided by the total number of characters being analyzed (respecting your include/exclude settings).

Can I sort the results?

Yes — click the column headers to sort by frequency (descending or ascending) or alphabetically by character.

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Character Frequency Analyzer

Analyze letter and character frequency in any text — great for cryptography.

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About this tool

Character Frequency Analyzer counts how often each character appears in your input text and displays the results as a sortable frequency table and a horizontal bar-chart histogram. Toggle case-sensitivity, choose whether to include or exclude spaces and punctuation, and sort the table by frequency (most common first) or alphabetically. Ideal for frequency analysis in cryptography, language studies, and text statistics.

How to use

1 Paste or type your text into the input area.
2 Adjust toggles: case-sensitive, exclude spaces, exclude punctuation.
3 View the frequency table — character, count, percentage, and bar chart.
4 Click a column header to re-sort the table.
5 Use the results to identify common letters or perform cipher analysis.

Frequently Asked Questions

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