Format Phone Numbers
Accepted Input Formats
This tool accepts virtually any common US phone number representation. Numbers are stripped to their 10-digit core (or 11-digit with country code 1) before reformatting.
| Input Example | Digits Extracted | Valid? |
|---|---|---|
| (212) 555-0100 | 2125550100 | ✓ Yes |
| 212-555-0100 | 2125550100 | ✓ Yes |
| 212.555.0100 | 2125550100 | ✓ Yes |
| +1 212 555 0100 | 2125550100 | ✓ Yes |
| 12125550100 | 2125550100 | ✓ Yes |
| 2125550100 | 2125550100 | ✓ Yes |
| 555-0100 | 5550100 | ⚠ Warn |
| 000-000-0000 | 0000000000 | ✗ Invalid |
| 555-1234-56789 | too many digits | ✗ Invalid |
NANP rules: area code first digit cannot be 0 or 1. Exchange (NXX) first digit cannot be 0 or 1. Numbers starting with 555 in the exchange are flagged as test numbers.
Why Format Matters
CRMs, dialers, and email tools all expect phone numbers in a specific format. Inconsistent formatting in a lead list causes import errors, skipped records, and failed calls. Clean your data before loading it.
Excel tip: when Excel strips leading zeros, paste your column here, download as .csv, and re-import with the column set as Text format. Use the Plain Digits format for maximum Excel compatibility.