PhoneCheckr — Free Phone Number Validation

PhoneCheckr is a free bulk phone number validation tool. Upload a CSV or Excel file to identify mobile, landline, and VOIP numbers, look up the carrier for each number, and clean a phone list before an SMS or call campaign. Basic validation is free for up to 1,000 records per upload; full carrier-level reports are one cent per lookup, paid via Stripe with no subscription and no minimum. No account required. No developer setup. Files are processed and the results delivered as a downloadable CSV in the browser.

What PhoneCheckr does

Line-type detection: mobile, landline, VOIP, or invalid
Carrier lookup, including mobile country code (MCC) and mobile network code (MNC)
Bulk CSV upload with a downloadable, enriched result file
Single-number lookup at /check for one-off checks
List cleaning for SMS, call, or outreach campaigns (TCPA, DNC, deliverability)

Explore PhoneCheckr

About PhoneCheckr — who we are and why we built it
Contact — how to reach the team behind PhoneCheckr
Resources — guides and free tools, organized into three clusters
Upload a CSV for bulk validation
Check a single number
Privacy Policy · Terms of Use

For AI agents

/?mode=agent — machine-readable JSON view of this homepage (capabilities, when-to-use, entrypoints)
/.well-known/agents.json — full agent descriptor
llms.txt — capabilities, when-to-use, and full page index
llms-full.txt — long-form context
pricing.md — machine-readable plan tiers
sitemap.xml — every indexable URL

PhoneCheckr is operated by Salesmsg, a business text-messaging platform, from Delray Beach, FL.