Transcript word error rate calculator
Compare a corrected reference transcript with a candidate using word edits, without uploading either text.
Paste a reference and candidate to get substitutions, deletions, insertions and WER: total edits divided by reference words.
Your result
Compare the same passage
First correct a short reference against the original recording using a tool you already trust. Paste the corresponding candidate passage, keeping the same start and end. A reference of “one two three” and candidate “one four three” has one substitution across three words, or 33.33% WER. Neither text is sent to a server.
Read the score with its limits
WER is the minimum word edit count divided by reference words. Extra words can push it above 100%. This implementation normalizes Unicode compatibility forms and case, ignores punctuation and segments with the page language. Ties prefer substitution, then deletion, then insertion, so edit-type counts can differ from other scorers even when total WER agrees. A wrong name and an unimportant word each count as one error; review important facts separately.