Free Unique Character Counter
The unique character count is the number of distinct characters in your text — regardless of how many times each appears. The word 'banana' has 6 total characters but only 3 unique ones (b, a, n).
How the Unique Character Counter Works
The counter scans every character in your text, builds a set of distinct ones, and reports the size of that set. Character matching is case-sensitive by default — 'A' and 'a' count as two different characters.
Tips & Best Practices
1Unique characters reveal vocabulary diversity
A high unique-to-total ratio signals rich vocabulary. A low ratio suggests repetition.
2Critical for password entropy
Password strength depends partly on character diversity. More unique characters = harder to crack.
3Useful for Unicode debugging
If your text renders strangely, the unique character count might include invisible characters (zero-width spaces, etc.) you didn't intend.
4Compress-test: low unique = high compression
Text with few unique characters compresses better. Use this counter to estimate compressibility before zipping.
Need a Full Text Analysis?
Our main Character Counter gives you a complete breakdown — characters, words, sentences, paragraphs, reading time, and keyword frequency — all in one view.
📊Open Full Character CounterFAQ
Related Counters
Unique Word Counter
Free unique word counter. Counts the number of distinct words in your text — a measure of vocabulary diversity used in writing analysis and SEO.
Letter Counter
Free letter counter. Counts only alphabetic letters (A–Z, a–z) in your text — ignoring spaces, digits, punctuation, and symbols.
Byte Counter
Free UTF-8 byte counter. Tells you the exact number of bytes your text takes up — useful for storage planning, API limits, and database sizing.