Character Frequency Counter — Character frequency analysis counts how often each character appears in a piece of text. It is the first step in classical cryptanalysis (substitution ciphers leave statistical fingerprints), a quick way to detect what language a text is in, and a useful sanity check when generating sample or test data.
Counting happens entirely in your browser.
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Character Frequency Counter是什么？
Character frequency analysis counts how often each character appears in a piece of text. It is the first step in classical cryptanalysis (substitution ciphers leave statistical fingerprints), a quick way to detect what language a text is in, and a useful sanity check when generating sample or test data.
Paste any text and get a ranked list of every character with its count, sorted from most to least frequent. Toggle case sensitivity and whitespace handling to fine-tune the result.
使用方法
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Paste text
Any length — works for sentences, paragraphs, or large corpora.
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Pick options
Toggle case sensitivity and whether to include whitespace.
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Read the ranked list
The most frequent character is at the top.
示例
English text
In English, "e" is by far the most common letter.
结果： e 12, t 9, a 8, o 7, i 6, n 6, s 6, h 5, r 5, …
Cryptanalysis hint
A frequency table for ciphertext can crack simple substitution ciphers.
结果： Most-frequent character matches a likely plaintext "e"
常见问题
相关工具
Last reviewed: 2026-09-25