Letter Frequency Analyzer
Instantly count how often each letter appears in your text — with percentages and visual frequency bars.
| Letter | Count | Percentage | Frequency Bar |
|---|
How to Use the Letter Frequency Analyzer
- Paste Your Text — Type or paste the text you want to analyze into the input box above.
- Choose Analysis Mode — Select whether to count case-insensitively, letters only, or include all characters.
- Click Analyze Frequency — The tool processes your text instantly in the browser.
- Read the Results — See each letter's count, percentage share, and visual frequency bar.
- Sort the Table — Switch between frequency order (most common first) and alphabetical order.
Key Features
Visual Frequency Bars
Each letter gets a proportional bar showing its relative frequency at a glance — no number-reading required.
Case-Insensitive Mode
Combine uppercase and lowercase counts automatically so A and a are treated as the same letter.
Percentage Breakdown
See each letter's exact percentage of total characters so you can compare against known frequency tables.
Dual Sort Options
Sort by frequency (most to least common) or alphabetically to find any letter instantly.
100% Private
All analysis runs in your browser. Your text never leaves your device.
Handles Large Texts
Analyze novels, research papers, or bulk content — up to 500,000 characters in one pass.
How Letter Frequency Analysis Works
Letter frequency analysis counts how many times each character appears in a given text and expresses it as a percentage of the total character count. The formula is straightforward:
Frequency % = (Count of letter ÷ Total letter count) × 100
For example, if the letter E appears 47 times in a 400-letter text, its frequency is (47 ÷ 400) × 100 = 11.75%.
In standard English, the approximate expected frequencies are: E (~12.7%), T (~9.1%), A (~8.2%), O (~7.5%), I (~7.0%), N (~6.7%). Deviations from these benchmarks are meaningful — they can reveal writing style, language of origin, or in cryptography, help identify cipher substitutions.
The tool applies the analysis character by character using a frequency map, then sorts the results based on your selected sort order before rendering the table and bars.
Practical Examples
Vikram was given an encrypted substitution cipher for a university assignment. He pasted the ciphertext into the analyzer, identified the highest-frequency character, and mapped it to E — cracking the first substitution in under a minute.
✔ Cipher decoded using frequency mappingNeha was comparing letter distributions across translated Bengali texts. She analyzed multiple English translations and used the frequency percentages to identify which translator's word choice produced the most natural-sounding English.
✔ Style comparison across 3 translationsMarcus pasted the Wordle word list into the analyzer to find the most frequent letters in 5-letter English words. The results showed that S, E, A, R, O dominate — giving him a data-backed starting word strategy.
✔ Data-backed Wordle opener identifiedKavya analyzes her long-form articles to check if she overuses certain sounds — a habit that makes prose feel repetitive. The frequency analyzer shows her letter patterns so she can revise for variety.
✔ Prose quality improved with dataWhat Is a Letter Frequency Analyzer?
A letter frequency analyzer is a tool that scans a block of text and counts the occurrence of each letter, then displays those counts as both raw numbers and percentages. It gives you a statistical picture of your text's character composition that is invisible to casual reading.
The technique has been used for centuries. Before computers, cryptanalysts used letter frequency analysis by hand to break substitution ciphers. Today it is used in natural language processing, writing style research, game strategy, and educational linguistics. The principle is the same: language has statistical patterns, and frequency analysis reveals them.
Beyond cryptography, writers use frequency analysis to identify unintentional repetition, researchers use it to compare writing styles across authors, and developers use it to validate that text encoding is working correctly on multi-language datasets.
Want to understand letter frequency analysis in depth — including its use in cryptography and linguistics?
Read our full guide: Letter Frequency Analysis Explained — From Cryptography to Word Games →Frequently Asked Questions
Is this tool free to use?
Does it count uppercase and lowercase separately?
Does it count numbers and punctuation too?
What is letter frequency analysis used for?
Which letter appears most often in English text?
Is there a text length limit?
Is my text kept private?
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