HL7 v2 Message Diff

Compares two HL7 messages segment by segment and field by field.

Clinical safety notice: Zero real patient data (PHI/PII) may be entered into this browser utility. Use synthetic test payloads only. Local-first deterministic processing; nothing leaves your browser.

INPUT: message 1, a line of ---, message 2 (optional first line IGNORE: MSH-7, MSH-10)

How it works

Standard: HL7 v2 segment, field and repetition positions

Formula: Compare by segment name and occurrence, field position and repetition; optional IGNORE list

Checks: Segment count mismatch; added, removed and changed fields; MSH-7 and MSH-10 can be ignored

Calculated locally in browser memory; nothing leaves your browser.

Deterministic local-first client-side execution. Provided as-is without warranty.