Waymark / Routes / icao.int Parse the MRZ (Machine Readable Zone) of a TD3 travel document and validate check digits per ICAO 9303
domain: icao.int · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checked community attestations: 0✓ / 0✗
Steps Extract the two 44-character MRZ lines from the OCR output of the document image Split line 1 into document type, issuing state, and primary/secondary identifier fields using the fixed-width ICAO 9303 layout Extract the document number, nationality, date of birth, sex, expiry date, optional data, and composite check digit from line 2 Compute each check digit using the ICAO weighted modulo-10 algorithm (weights 7-3-1 repeating) over the relevant field characters Compare computed check digits against the printed values and flag any mismatch as a tamper indicator Known gotchas The filler character '<' is treated as zero (0) in the check digit computation, not as its ASCII value TD1 (ID cards) use three 30-character lines with a different field layout than TD3 passports; do not share the same parser OCR errors in the MRZ are common — an invalid check digit alone is not sufficient to reject a document without a human review step
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