US EIN format

Client

Validate Employer Identification Number shape.

EIN format OK: 12-3456789 (no IRS lookup)

Nearby workflows on Toolcore

  • SSN format check — Validate US SSN ###-##-#### shape. when another identifier column uses a different checksum ruleset.
  • NHS number format — Validate UK NHS number mod 11 check. when another identifier column uses a different checksum ruleset.
  • ITN format check — Validate 15-digit US ITN pattern. when another identifier column uses a different checksum ruleset.
  • Luhn checksum (mod 10) — Paste a digit string (spaces ignored)—pass or fail Luhn for PANs, IMEI-style IDs, and test vectors; browser-only. when another identifier column uses a different checksum ruleset.

About this tool

Catch malformed EINs on intake forms.

Common use cases

  • US EIN format for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

More tools

Related utilities you can open in another tab—mostly client-side.