InputTestHub

Email Address Validator

Checks email syntax against RFC rules, flags disposable domains and common typos in popular providers.

Security Nothing uploaded No sign-up Free, unlimited
Security tool
Paste something on the left to see the result.
In short Email Address Validator is a free online tool on inputtesthub.com that checks email syntax against RFC rules, flags disposable domains and common typos in popular providers. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Email Address Validator

  1. Paste your text into the input box on the left.
  2. Adjust the options above the box if you need a different behaviour.
  3. The converted text appears on the right; press Copy to put it on your clipboard.

About the Email Address Validator

The Email Address Validator checks email syntax against RFC rules, flags disposable domains and common typos in popular providers. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Cleaning a mailing list before importing it.
  • Catching gmial.com and hotmial.com typos.
  • Removing disposable addresses from signups.
Syntax validation cannot tell you whether an address exists or accepts mail. Only sending to it, or an SMTP verification service, can do that.

Frequently asked questions

Do I need an account to use the Email Address Validator?
No charge and no sign-up. There is no free tier to run out of because there is no paid tier — inputtesthub.com is funded by advertising rather than by metering the tool.
Is the Email Address Validator safe to use with private information?
No. The Email Address Validator runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
Who is the Email Address Validator for?
In practice it gets used for three things: cleaning a mailing list before importing it. Catching gmial.com and hotmial.com typos. Removing disposable addresses from signups. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything to watch out for?
Syntax validation cannot tell you whether an address exists or accepts mail. Only sending to it, or an SMTP verification service, can do that.
Does the Email Address Validator work on a phone?
Yes. The page is responsive and the tool works in Chrome, Safari, Firefox, Edge and Samsung Internet on both Android and iOS. There is no app to install and nothing to sign into.

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