Why this tool is useful
Use Jaro–Winkler for names and compact records where transposed characters and an exact leading prefix should influence a review score.
Text & List Tools · runs locally
Jaro–Winkler Similarity Calculator
Score short strings from 0 to 1 while rewarding matching order and a shared prefix of up to four graphemes.
Ready. Your working data stays in this browser.
How it works
The browser finds characters within the Jaro matching window, counts transpositions and applies the standard prefix boost only when base similarity exceeds 0.7.
Practical example
MARTHA compared with MARHTA produces approximately 0.961111, with the MAR prefix receiving the Winkler adjustment.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.