Phone Number Validator
Paste one number or a whole column. The validator checks each entry against real numbering-plan rules, tells you the country and line type, explains why a number fails, and converts every valid entry to clean E.164.
| Input | Result | Country / Type | E.164 |
|---|
How the Phone Number Validator Checks Each Line
Three passes turn messy input into a clear verdict.
Clean the Input
Spaces, dashes, dots, brackets and extensions such as "ext. 12" are stripped, and a leading + or 00 marks the number as international.
Find the Country
The country code is read from the number itself, or the default country is applied and its trunk prefix (0 or 1) removed.
Apply Plan Rules
Length, leading digits and reserved ranges are checked, then the number is labelled mobile, landline, toll-free or fictional.
Why Validate Phone Numbers Before You Store Them
Bad numbers are cheaper to catch at the door than to clean up later.
A single phone column often mixes national and international formats, typos and placeholder data. Validating it early prevents failed SMS sends, duplicate contacts and broken click-to-call links.
- CRM and Contact List Cleanup: Find entries with missing digits or impossible area codes before a sales team starts dialling.
- Import Checks for CSV Uploads: Paste a column from a spreadsheet to see how many rows will fail before you run the import.
- SMS Campaign Pre-Flight: Messaging APIs expect E.164. Normalize numbers first so fewer messages bounce and fewer credits are wasted.
- Spotting Placeholder Data: Numbers from fictional ranges such as 555-0100 to 555-0199 are flagged, so test records do not end up in live campaigns.
- Form Validation Design: See which real-world inputs your own form regex would wrongly reject, like numbers with extensions or a 00 prefix.
- Deduplication: Two numbers written as 020 7946 0123 and +44 20 7946 0123 become identical in E.164, so duplicates are easy to spot.
Validation Rules by Country
The numbering-plan checks this validator applies.
| Country | Code | Digits after trunk prefix | Mobile starts with | Common failure |
|---|---|---|---|---|
| United States / Canada | +1 | 10 | Any valid area code (no mobile prefix) | Area code or exchange starting with 0 or 1 |
| United Kingdom | +44 | 9–10 | 7 (not 70 or 76) | Missing a digit after 07 |
| Australia | +61 | 9 | 4 | Landline typed without its area code |
| Germany | +49 | 6–11 (variable) | 15, 16, 17 | Mobile number with too few digits |
| France | +33 | 9 | 6 or 7 | Extra 0 kept after +33 |
| India | +91 | 10 | 6, 7, 8 or 9 | Leading 0 plus 10 digits entered as 11 |
| Pakistan | +92 | 9–10 | 30–35 | Mobile typed with only 6 digits after 03XX |
Numbers from other countries are recognized by calling code and checked against the E.164 maximum of 15 digits, but their internal ranges are not verified. A format-valid result means the number could exist, not that it is currently connected.
Format Validation vs Live Number Lookup
Knowing a number is well-formed is different from knowing it works.
Format Validation
This tool- Checks length, prefixes and country rules
- Detects line type from the number range
- Runs instantly and offline in your browser
- Free for any number of rows
- Private: numbers never leave your device
- Cannot tell if a line is active or ported
Live Lookup (HLR / carrier API)
Paid network query- Queries the network or a carrier database
- Reports whether the number is reachable
- Can return the current carrier after porting
- Charged per lookup
- Sends each number to a third party
- Slower, and needs consent in some regions
Getting Reliable Validation Results
Small input habits make a big difference.
Tips for Accurate Checks
- Set the right default country — numbers without a country code are read using it.
- Keep the + sign when you have it — it removes all guesswork about the country.
- Store the E.164 output — keep the original text for display if you like, but match and send using E.164.
- Review "Check note" rows — they are well-formed but fictional, or from a country without detailed rules.
- Download the CSV report — share the reason column with whoever owns the source data.
Common Validation Pitfalls
- Assuming valid means reachable — a perfectly formed number can still be disconnected.
- Rejecting extensions outright — strip them into a separate field instead of failing the whole number.
- Keeping the trunk 0 after the country code — +44 07700 is wrong; +44 7700 is right.
- Validating with one regex for every country — digit counts differ by country and even by line type.
- Pasting vanity letters — convert 1-800-FLOWERS to digits with the mnemonic tool first.
Tools Showcase
Explore more free, browser-based phone number utility and testing tools.
Phone Number Verification Generator
Test phone numbers paired with OTP codes for sign-up flows.
Temporary Phone Number Generator
Disposable test numbers that expire on a timer you choose.
Phone Number Mnemonic Generator
Turn digits into memorable keypad words, or words into digits.
Phone Number Link Generator
tel:, sms:, WhatsApp and messenger links with HTML snippets.
Phone Number Validator FAQs
What the checks mean and how to read the results.
No. It checks that the number follows its country's numbering plan. Only a carrier lookup can confirm a line is connected.
E.164 is the international standard format: a plus sign, the country code and the national number with no spaces, such as +442079460123. Most SMS and calling APIs require it.
Up to 500 lines per run. Each line is checked separately.
It is correctly formed but either sits in a fictional range, like 555-0147, or belongs to a country where only the calling code and length are checked.
Yes, for the eight detailed countries it labels mobile, landline, toll-free and premium ranges. In the US and Canada mobile and landline numbers share the same ranges, so they are reported together.
Yes. Endings such as x123, ext. 45 or #7 are removed before checking the main number.
No. Validation runs entirely in your browser, so the numbers you paste are never sent to a server.
North American area codes cannot start with 0 or 1, so 123 is not a possible area code.