Letter Frequency Counter
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What is the Letter Frequency Counter?
The Letter Frequency Counter analyzes your text to determine how often each character appears. It provides detailed statistics on letters, digits, and special characters, showing both raw counts and percentages.
This tool is invaluable for cryptography, language analysis, and understanding text patterns. Whether you're studying cipher texts, analyzing writing styles, or simply curious about character distribution, this tool provides clear visual insights.
All processing happens directly in your browser, ensuring your text remains private and secure. No data is sent to any server.
Common Uses for Letter Frequency Counter
Cryptography
Letter frequency analysis is fundamental in cryptanalysis. Understanding character distribution helps break substitution ciphers and decode encrypted messages.
Language Identification
Different languages have unique letter frequency patterns. English has high 'e' and 't' frequencies, while other languages differ significantly.
Writing Analysis
Analyze your writing style or compare texts. Character distribution can reveal authorship patterns and stylistic choices.
Data Quality
Check for unusual character distributions in data sets. Unexpected frequencies may indicate data quality issues or encoding problems.
Frequently Asked Questions
What is letter frequency analysis?
Letter frequency analysis is the study of how often each letter appears in a given text. In English, 'e' is the most common letter (~12.7%), followed by 't' (~9.1%), 'a' (~8.2%), and so on. This pattern is consistent across large bodies of text.
How is this used in cryptography?
In simple substitution ciphers, each letter is replaced with another. By analyzing the frequency of letters in the encrypted text and comparing it to expected English frequencies, cryptanalysts can often deduce which letters map to which.
Why does case sensitivity matter?
In case-insensitive mode, 'A' and 'a' are counted together. Case-sensitive mode treats them as different characters, which is useful for analyzing capitalization patterns or programming code where case matters.
What are special characters?
Special characters include punctuation marks (!@#$%^&*), mathematical symbols (+=-), and any character that isn't a letter, digit, or whitespace. These can reveal formatting patterns in your text.
Is my text stored anywhere?
No, all analysis happens entirely in your browser. Your text is never sent to any server or stored anywhere. This ensures complete privacy for sensitive documents.