▸ FREE TOOL · PHONE NUMBER FORMATTER

Clean a phone listin one paste.

Paste a column of phone numbers or open a CSV, pick a format, and get a clean list back: E.164 (+14155550132), (415) 555-0132, dashes or plain digits. Duplicates are removed, and numbers that cannot be dialed are listed with the reason, using the same checks a dialer runs. It all happens in your browser.

Free, no account · Updated 2026-11-04 · Inilathala ng DialerSeat · Paano kami nagsasaliksik
Your list stays in this browser tab. Nothing is uploaded: open your browser's network tab while you use it and you will see no requests.
9Rows read
4Handang mag-dial
2Duplicates removed
3Can't be dialed
NumberLocationTime zoneNote
+14155550132CaliforniaAmerica/Los_Angeles
+12125550198New YorkAmerica/New_York
+13055550177FloridaAmerica/New_York
+18005550123Toll-free—Toll-free: a business line, not a person
Rows that can't be dialed, and why
555-0101Wrong number of digits
(011) 555-0199Not a number the North American plan can route
John Smith 617 555 0143Contains letters

US and Canadian numbers (the North American Numbering Plan). The checks are the ones DialerSeat runs before dialing: 10 digits, an area code and exchange that can't start with 0 or 1, no N11 service codes, no letters. Location comes from the area code, which shows where a number was issued; mobile numbers keep their area code when people move.

Questions people ask

What is E.164 format?

The international standard for phone numbers: a plus sign, the country code and the number, with no spaces or punctuation. A US number in E.164 is +1 followed by its 10 digits, like +14155550132.

Why is a number marked as impossible?

North American area codes and exchanges never start with 0 or 1, and N11 codes like 411 are service numbers. A number breaking those rules cannot ring a phone, whatever it looks like.

How do I remove duplicate phone numbers?

Leave "Remove duplicates" on. Numbers are compared after formatting, so (415) 555-0132 and 415.555.0132 count as the same number.

These are the checks DialerSeat runs before it dials. $35 a week per seat.

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