Process files up to the browser memory limit.

Can invalid rows be filtered out?

Yes — filter to show only valid or only invalid numbers.

Phone Validator

Validate and normalize phone numbers in a CSV column. International format support. Processed entirely in your browser for 10

Your files never leave your device. Processed locally. 100% private.

Unlocking Tool Engine...

Complete your task perfectly in just three straightforward steps.

Drop your CSV file with a phone number column.

Choose which column holds phone numbers.

Download the CSV with a validation status and normalized format column added.

Everything you need to know about the Phone Validator.

What validations are performed?

Format syntax, country code detection, mobile vs landline classification, and E.164 normalization.

Which countries are supported?

195+ countries using the libphonenumber library.

Is my file uploaded?

No. Everything runs locally in your browser.

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