Character Error Rate (CER) Calculator

Compare a reference transcript with hypothesis text, inspect exact differences, and compute CER & WER.

Comparison & Normalization Settings

Text Normalization

Normalize whitespace Collapses multiple spaces/newlines Ignore case Treat uppercase and lowercase identically Ignore punctuation Strip punctuation symbols before comparison Strip accents / diacritics Convert accents (é → e, ñ → n)

Structure & Section Weighting

Structure-sensitive mode Preserves line breaks and computes line errors

Line break penalty weight Factor added to CER (0.0 to 2.0)

Reference Text (Ground Truth)

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Hypothesis Text (Prediction / OCR)

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Tip: Press Ctrl + Enter to compute