Free Phone Number Validator
Check any number against E.164 and country formatting rules instantly — see exactly why a number fails, not just that it did.
Enter a number, with or without formatting, to validate it.
A bad number is cheap to catch, expensive to ship.
Most number problems are a missing country code, a leftover trunk prefix, or a dropped digit — none of it needs a live network query. Just a check against rules that don't change: E.164 structure and each country's expected length.
Rules-based today, live status on demand.
The free validator runs entirely in your browser, checking the "+", dialing code, E.164 length range, trunk prefix and per-country digit range — every failure reason is shown.
What it can't tell you is whether a well-formed number is actually reachable right now — that needs a live carrier query via the Lookup API or a Rozper account.
Validate numbers in bulk.
The Lookup API validates and checks live status for thousands of numbers per call — ideal for CRM cleanup and pre-send SMS scrubbing.
Questions, answered.
Validate with confidence, at scale.
Start a free trial to access the Lookup API, or book a demo to see it on your own data.