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Phone Number Validator

Validate international phone numbers with libphonenumber locally—parse, normalize, and catch malformed inputs.

Results

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Status
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Details
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Formatted
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How to use this validator

  1. Paste or type the phone number (include country code for accuracy).
  2. Run validate to parse and normalize.
  3. If invalid, add/move the country code or fix spacing/digits, then re-run.

Rules & checks

Parses with libphonenumber for country-aware validation.

Returns international/E.164 format when valid.

Everything runs locally; no data is sent or stored.

Inputs explained

  • Phone number

    Paste a phone with country code (e.g., +1 415 555 1234). We normalize spacing; include country codes for best results.

When to use it

  • Validate signup or support form numbers before storing
  • Normalize phone numbers to international format for CRMs/ESPs
  • Check customer CSV imports for malformed numbers

Common errors

  • Missing country code
  • Too few digits for the region
  • Invalid characters or spacing

Limitations

  • Format-only; does not confirm ownership, activity, portability, or carrier reachability.
  • Parsing accuracy depends on having the country code.
  • Does not detect disposable/virtual numbers; focuses on syntactic validity.
  • Large pastes (bulk lists) are not supported in one go—check numbers individually.

Tips

  • Encourage users to include country codes
  • Store E.164 format (+14155551234) for consistency
  • Trim whitespace before validating

Examples

Valid US

  • +1 415 555 1234 -> Valid; formatted to +14155551234

Valid UK

  • +44 20 7946 0958 -> Valid; formatted to +442079460958

Invalid short

  • 123 -> Invalid (too short)

Missing country

  • 415 555 1234 -> Invalid until country code is added

Deep dive

This phone validator uses libphonenumber to parse and normalize international numbers entirely in your browser—no uploads, no storage.

Use it to clean form inputs and CSV imports before saving or sending to CRMs/ESPs, and pair it with region-aware messaging workflows.

FAQs

Do you check if the number is active or reachable?
No. This validates format; it doesn’t perform carrier or reachability checks.
Which countries are supported?
libphonenumber supports most international formats. Include a country code for best results.
Is my phone number stored?
No. Parsing happens in your browser only and clears on refresh.
Can I validate many numbers at once?
This tool is for single numbers. For bulk lists, validate each or use a server-side batch process.
Why did a number fail?
Common issues: missing country code, too few digits, or non-digit characters. Normalize and re-run.

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All validation happens in your browser. No data is sent, logged, or stored.

Format-only; does not confirm ownership, activity, or reachability.