Phone Number Validator
Check whether phone numbers are valid, detect their country, and format them to international E.164, one number or a whole list.
✔ 100% Free✔ No Signup✔ No Watermark✔ Unlimited Use
Check If a Phone Number Is Valid, Instantly
This free phone number validator checks numbers against international numbering rules: correct country code, correct national length for that country, and proper E.164 format (the +14155551234 style used by SMS gateways, CRMs and WhatsApp).
Paste one number or a list of up to 500, each is validated, its country identified, and valid numbers are normalized so you can copy a clean E.164 list for your systems. Everything runs in your browser; numbers are never uploaded.
Use it as a quick phone number checker or verifier before you import a list. It works for mobile, cell and landline numbers, and it tells you whether each entry looks real and correctly formatted for its country.
Note: format validation confirms a number can exist, it cannot confirm the line is active. Carrier-level checks require paid lookup APIs; this tool catches the formatting errors that cause most failed SMS and calls.
How to Use the Phone Number Validator
- 1Enter phone numbers one per line, each starting with its country code (+1, +44, +91 …). "00" prefixes are converted automatically.
- 2Click Validate Numbers.
- 3Review the per-number verdicts, invalid entries show exactly what's wrong.
- 4Copy the cleaned E.164 list of valid numbers for your CRM, SMS tool or spreadsheet.
Why Use MakeToolz's Phone Number Validator?
50 country rulesets
Length rules for the US, UK, India, EU countries, Brazil, Nigeria and 40+ more, with sensible E.164 fallback for the rest.
Bulk validation
Check up to 500 numbers at once with a summary count and per-line diagnosis.
E.164 normalization
Valid numbers are reformatted to the +[country][number] standard used by Twilio, WhatsApp and every modern API.
Clear error reasons
Not just "invalid", see whether the country code is missing or the length is wrong for that country.
Private
Validation is pure in-browser JavaScript. No number you paste is ever transmitted.
Free
Unlimited checks, no account.
Validation Versus Verification: The Key Difference
Validation and verification sound alike but they answer different questions. Validation asks: is this number written correctly for its country? Verification asks: is this number a real, active line right now? This tool does validation. It confirms the country code is real, the national length is right for that country, and the number sits in clean E.164 format. It cannot ring the line to confirm someone owns it, because that needs a paid carrier lookup.
Knowing the difference saves money and confusion. Format validation catches the errors behind most failed texts and calls, wrong length, missing country code, stray characters, without any per-check fee. You only need paid verification when you must prove a line is switched on.
How the Checker Reads a Number
First the tool strips everything that is not a digit or a plus sign, so spaces, dashes, and brackets do not matter. A leading 00 is converted to a plus, since both mean "international". Then it reads the country code from the front, longest codes first so +1 is never confused with +1 something. The remaining digits are the national number, and the tool checks that count against the rule for that country. If it fits, the number passes and is rewritten in E.164.
Why E.164 and Country Codes Matter
E.164 is the format SMS gateways, CRMs, and WhatsApp all expect: a plus, the country code, then the national digits with no spaces. The table shows how the same number looks messy in local style and clean in E.164.
| Country | Local style | E.164 output |
|---|---|---|
| United States (+1) | (415) 555-1234 | +14155551234 |
| United Kingdom (+44) | 07911 123456 | +447911123456 |
| India (+91) | 098765 43210 | +919876543210 |
| Germany (+49) | 0151 23456789 | +4915123456789 |
Notice that local formats often start with a trunk 0. That 0 is dropped in E.164 and replaced by the country code, which is why a UK 07911 becomes +447911.
Benefits and Limits
The benefit is catching structural errors in bulk before you import a list, up to 500 numbers at once, each with a clear reason when it fails. The limits are honest: the tool does not label a number as mobile or landline, and it cannot say whether the line is in service. Both of those require carrier data behind a paid API. What it does do is turn a messy column of numbers into a clean E.164 list your systems will accept.
Common Mistakes to Avoid
The most common error is leaving off the country code. A national number like 0791 112 3456 is ambiguous, several countries could claim it, so the tool asks you to add a plus and the code. The second common error is keeping the local trunk 0 after the country code, which makes the number too long. Drop the 0 when you add the code. A third is expecting the tool to confirm the line is real; validation checks structure, not status.
If your numbers are buried inside a block of text rather than one per line, pull them out first with the phone number extractor, then paste the clean list here to validate.
Tips for Clean Bulk Validation
- Put one number per line and start each with its country code.
- Let the tool handle spaces and dashes; you do not need to strip them yourself.
- Copy the E.164 output straight into your CRM or SMS tool to avoid formatting bugs.
- Need to prepare other contact fields too? Clean up the surrounding data with the email extractor in the same pass.
People Also Ask
What does E.164 format look like?
A plus sign, the country code, then the national number with no spaces or punctuation, such as +14155551234. It is the format required by SMS APIs and most CRMs.
Why does the tool say my number is the wrong length?
Because the digits after the country code do not match that country's rule. Often this is a leftover trunk 0 or a missing digit. Fix the count and revalidate.
Can it tell mobile from landline?
No. Splitting mobile from landline needs a paid carrier lookup. This tool validates format and length, which applies to both line types the same way.
Do I have to remove spaces and dashes myself?
No. The checker strips every character that is not a digit or a plus before it reads the number, so formatted input works fine.
How do I handle numbers that start with 00?
Leave them as they are. A leading 00 means "international" and the tool converts it to a plus automatically.
Can it confirm a number is active?
No free tool can. Confirming an active line requires carrier verification, which is a paid service. This tool confirms the number is structurally valid.
How many numbers can I check at once?
Up to 500 per run, so the browser stays responsive. Split larger lists into batches and validate each one.