CHAR FREQ
Character Frequency, for crypto & text analysis.
Character Frequency: count how often each character or UTF-8 byte appears in text, with a visual bar chart, for crypto and text analysis. Free online, runs locally in your browser, nothing uploaded.
How to use?
Paste text and pick a mode: count each Unicode code point; count UTF-8 bytes after encoding; or count only A–Z ignoring case. Click "Analyze" to get a descending bar chart — handy for frequency analysis of classical ciphers (substitution, Vigenère) and for inspecting text distributions before cleaning. Everything runs locally; nothing is uploaded.
FAQ
Is it safe? Are my data uploaded?
Everything runs locally in your browser. None of your text is uploaded.
Can frequency analysis crack a cipher directly?
It helps with classical substitution ciphers (Caesar, Vigenère); modern encryption (AES etc.) produces near-random output where frequency analysis is useless. This tool is for learning and security research only.