Free tool · rule pack 2026.07.20

Validate an X12 file before it enters the next system.

Paste or upload a supported X12 interchange. Get exact envelope, control, segment-count and required-segment findings without retaining anonymous document content. Anonymous documents are never retained.

SUPPORTEDDeep: X12 856
Structural: 810 / 824 / 846 / 850 / 855 / 997 / 999

X12 auto-detect

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Your report appears here.

Start with a sample if you want to see the output before using a live document.

✓ Exact segment or JSON pointer
✓ Evidence class and source link
✓ Concrete remediation
✓ Versioned rule pack

Retain this payload encrypted Sign in to enable optional retention.

A structural preflight does not prove full X12 or trading-partner conformance. Current licensed implementation guides remain controlling.

X12 envelope

Deterministic controls

ISA/IEA, GS/GE and ST/SE controls and counts are checked against the exact received bytes.

Named rule pack

Visible structural scope

Required anchors and the business checks still outstanding are reported separately.

Partner profile

No invented conformance

Licensed transaction-set and current account-guide rules remain explicit production requirements.