Text Similarity Calculator
Calculate normalized character similarity from exact Levenshtein edit distance.
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How to use
Paste two texts and choose normalization rules. The percentage is 100 × (1 − edit distance / longer normalized length).
Example
Input
kitten
Output
Similarity: 57.14%
Levenshtein distance: 3
Compared lengths: 6 and 7 graphemes
Limitations
This measures character edits only. It is not semantic similarity, plagiarism detection, authorship analysis, or evidence of copied work.
Frequently Asked Questions
What edits count?
Levenshtein distance counts single-grapheme insertions, deletions, and substitutions needed to transform one text into the other.
Does 100% prove the original texts are identical?
Only under the selected normalization rules. Ignored case, spaces, punctuation, or diacritics can differ in the originals.