Analyze which character appears most frequently in ciphertext or plain text. Visual bar chart, sort options, CSV export. Free, local processing.
TL;DR: Free online character frequency analyzer for plain text or ciphertext — see which character appears most frequently, with bar chart and CSV export. Local processing, no uploads.
This tool runs entirely in your browser. Open DevTools → Network panel and search your input — it appears in no request.
Next steps
Usage Guide
Counting characters one by one to analyze ciphertext frequency, spot abnormal glyphs, or profile a long text is tedious. This tool tallies per-character counts and percentages with case-insensitive and whitespace options, plus four sort orders — all computed locally.
1. Count character frequency
Case-insensitive merges A/a; including whitespace lists the space as its own row — usually you want it excluded when profiling letters.
- Paste the text to analyze.
- Toggle case-insensitive and include/exclude whitespace.
- Pick a sort order (count or char) and read the distribution.
2. Typical uses
An outlier percentage often signals encoding issues or encryption — follow up with base64-decoder or unicode-encoder-decoder.
- Crypto intro: compare ciphertext char frequency against common English/Chinese distributions.
- Validate exports: catch zero-width or invisible characters.
- Long-text stats: see which letter or Han char dominates.
FAQ
Completely free, no registration required. Paste text in your browser to count character frequency — all operations run locally.
Supports case sensitivity toggle, whitespace inclusion toggle, sort by frequency or alphabet, and CSV export of results.
Yes. Paste ciphertext (or a fragment) and sort by count to see which character appears most often — the classic first step in cryptography frequency analysis. In English plaintext, letters like E/T/A tend to dominate; weak ciphers such as simple substitution often preserve a similar distribution.
No. Analysis runs locally in your browser; your data is never sent to any server, ensuring privacy.
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