Free online tool
Passport Calculator
A free online passport calculator for the ICAO Doc 9303 Machine Readable Zone. Generate the two TD3 lines from your passport data, calculate every check digit, and validate scanned MRZ strings — all in your browser, with no signup and no data sent to a server.
MRZ Validator
Paste any MRZ to verify check digits and parse every field.
Batch Validator
Validate hundreds of MRZ strings at once.
Format Converter
Convert MRZ between TD1, TD2, TD3 and MRV formats.
What does a passport calculator do?
- Generate: build the 2×44 TD3 MRZ from raw fields (name, country, doc number, dates, sex).
- Check digits: apply the ICAO 7-3-1 weight algorithm and produce the four field digits plus the composite digit.
- Validate: parse an existing MRZ string and flag any mismatched check digit or out-of-range value.
- Convert: move between TD1 (3×30), TD2 (2×36), TD3 (2×44) and MRV-A/B visa formats.
Is it really free?
Yes — every tool on MRZCalculator.com is free to use, requires no account, and processes your data entirely on-device. We never upload your MRZ to a server. The tools are licensed for personal and commercial use.
Try the calculator
Related tools
MRZ Validator
Validate ICAO 9303 MRZ lines and every check digit.
MRZ Scanner
Read MRZ text from a passport or ID photo.
MRZ Check Digit Calculator
Compute the ICAO 9303 check digit for any field.
MRZ Format Converter
Convert MRZ between TD1, TD2 and TD3.
MRZ Batch Validator
Validate many MRZ records at once.
Barcode Scanner
Read PDF417, QR and other codes from an image.