How many free verifications can I do per day without logging in?

The free email verifier on Valid Email Checker (the form at /tools/email-verifier and the Try It Now widget on the homepage) lets you run a single verification at a time, with a rate limit measured against the last 24 hours of activity from your network identity. The exact cap depends on what kind of IP you are connecting from.

The actual limits

• 3 verifications per 24-hour rolling window if you are on a normal residential or mobile IP.
• 1 verification per 24-hour rolling window if your IP is flagged as a VPN exit, Tor exit, or commercial datacenter range — see why am I limited to 1 per day from a VPN or datacenter IP for the reasoning.

How the window rolls

The 24 hours is rolling, not a calendar reset. If you verified one address at 14:00 yesterday, that slot frees up at 14:00 today. The form shows a "verifications remaining" count below the result panel, so you can always see where you stand without doing the math.

How your identity is tracked

Quota is keyed on a SHA-256 hash of your IP address plus a browser fingerprint generated client-side. The pair is stored in our public_verify_attempts table along with the timestamp; rows older than 7 days are purged on a rolling schedule. The composite identity means:

• Switching browsers does not reset the count. Same IP, same household, the cap is shared.
• Incognito does not reset the count. The fingerprint is derived from device properties, not cookies.
• Switching networks does. Moving from your home wifi to mobile data gives you a fresh IP and effectively a fresh quota.
• Family/office IPs share the quota. Three people on the same office network sharing one public IP collectively have 3 verifications per day, not 9.

When you need more

If 3 per day is not enough, the next step is the free 200-credit signup. Signing up takes about 30 seconds (email plus password, or Continue with Google), confirms your email, and lands 200 credits on the account immediately. That is 200 single-email verifications, or one bulk upload of 200 addresses, with no daily cap. It is the same engine — see difference between free verifier and dashboard for what the dashboard adds beyond just removing the rate limit.