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E.164 format

Phone number format verifier (E.164)

Validate international E.164 format and country tips. Does not confirm WhatsApp registration (requires Meta API).

Last updated: September 15, 2026

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Result

Paste a number to validate the format

Explicit limit: format ≠ WhatsApp registration. A valid E.164 number may not have WhatsApp, and we do not “discover” that here.

LatAm tips

  • MX. Mexico: often 52 + 1 + 10 digits for mobiles toward WhatsApp (e.g. 52155…). Avoid leaving local 044/045.
  • CO. Colombia: 57 + 10-digit mobiles (3xx…). No national trunk 0.
  • AR. Argentina: 54 + 9 + area + number on typical mobiles toward WhatsApp. Local 15 does not belong in E.164.
  • CL. Chile: 56 + 9 + 8 digits on current mobiles. No long-distance 0.
  • BR. Brazil: 55 + area code + 9-digit mobiles. Confirm the ninth digit by area.
  • PE. Peru: 51 + 9-digit mobiles (9…). No exit prefixes.

This tool checks whether a number looks well-formed in E.164 (country code + national number, without extra symbols) and shows LatAm tips. It cannot confirm the number is registered on WhatsApp: that needs Meta APIs/permissions. Use it before building wa.me, QR, or Cloud API briefs.

How to use it

  1. 01Paste the number with or without +, spaces, or dashes.
  2. 02Check the detected country code and normalized form.
  3. 03Fix common LatAm trunk zeros or extra digits.
  4. 04Use the clean E.164 in wa.me / QR / Cloud API onboarding.

Format ready. Now the number has to answer.

42agents connects that number to Cloud API + agent under your brand. From USD 39 per account. 7-day trial; sign up in the dashboard.

What problem it solves

  • A wa.me or Cloud API onboarding with Argentine 15, Mexican 044, or a trunk 0.
  • Mixing up “well-formed number” with “has WhatsApp.”
  • Wasting brief time because E.164 was not normalized.

Who it is for

Anyone building wa.me or QR

Confirm international format before generating the link.

Anyone onboarding Cloud API

Agencies and software houses that do not want an invalid number in Embedded Signup.

Not a WhatsApp account detector

If you need to know whether WhatsApp exists, that takes Meta’s platform, not this page.

What it includes

Normalization

Strips symbols and suggests a clean E.164.

LatAm tips

MX, CO, AR, CL, BR, PE with typical dialing mistakes.

Limit callout

Format ≠ registration. We say it on the page on purpose.

Frequently asked questions

You may also need

Next step

Ready for the 7-day trial?

From USD 39 per account. Free trial on any plan. White-label under your brand. Signup is available in the dashboard.

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