Free Email Validator · validate an address format in 1s
Free Email Validator
Instantly validate an email address format: rule-compliant syntax, domain, typos and risk signals. Get a quality score in 1 second, right in your browser.
By Alex · Sales category
Address to validate
Validation runs as you type.
Validation result
Format and quality checks in real time.
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Format and quality validation runs in your browser. Whether the mailbox actually exists is only confirmed by a server-side check or a real send.
What is an email validator?
An email validator is a tool that checks whether an address is correctly formed and compliant with the rules for writing an email, before you use it. It inspects the syntax, the presence of a plausible domain, typos and risk signals, then sums it all up with a quality score.
Validation is a basic hygiene step: a malformed address is a guaranteed bounce, which hurts your deliverability and your sender reputation. Validating at the point of entry, or before an import, keeps errors out of your list.
Rule-compliant format
Checks the address follows the rules of a valid email (one @, a domain, an extension).
Fewer bounces
Removing malformed addresses before you send lowers your bounce rate and protects your domain.
Typos caught
gmial.com, hotmial.com, outlok.com: the tool suggests the correct domain at a glance.
Private
Format validation runs in your browser: nothing is sent or stored.
How the email validator works
The tool runs a series of instant checks without sending a single message. Each check feeds an overall score from 0 to 100 and a clear verdict.
The rules for validating an email
A valid address follows a precise structure: a local part, an @ symbol, then a domain with an extension. The validator checks in particular these points:
john@@acme.comjohn..doe@acme.comjohn@acmejohn@acme.cjohn doe@acme.comYour emails bounce or land in spam: where's the problem?
A valid list helps, but it's only part of the equation. Take this 30-second quiz to find what's really dragging down your results.
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Validating isn't enough: find the right contacts with Gojiberry
A validator makes what you already have reliable. It won't tell you who's worth contacting, or when. Gojiberry is an AI-powered, multi-channel prospecting platform: it tracks 30+ buying-intent signals across socials and the web, surfaces leads who are in-market right now, then triggers personalized outreach across channels.
The result: instead of spending your energy scrubbing lists, you start from qualified, interested contacts reached at the right moment. Deliverability follows naturally when you write to people who are expecting your message.
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Automate my prospectingPros and limits of an email validator
A validator is essential for list hygiene, but you need to know its exact scope.
- Free and instant, with no sign-up and no message sent.
- Checks format compliance and catches typos.
- Lowers your bounce rate and protects your sender reputation.
- Private: format validation runs in your browser.
- A valid format doesn't guarantee a mailbox exists and receives.
- Doesn't find new prospects: it makes the existing list reliable.
- Says nothing about a contact's interest or intent.
- A valid address is not an address that will reply.
Best practices for a reliable email list
Validating an address is a start. Here's how to keep your whole list healthy over time.
Validate at entry
Check the format the moment an address enters your system, on your forms and at import. Rejecting or fixing a malformed address on the spot prevents a guaranteed bounce later.
Add a server-side check
Format validation doesn't confirm a mailbox exists. For high-stakes sends, add a server-side SMTP verification or monitor bounces after the send.
Ban disposable domains
Temporary addresses add no value and artificially inflate your volumes. Filter them at the door to keep a reliable list.
Clean regularly
Addresses go stale: people leave, roles change, domains close. Periodic cleaning and bounce management keep your deliverability in the green.
Email validator or prospecting platform?
The two are complementary but answer different questions. One makes your data reliable, the other fills your pipeline.
FAQ · email validator
Yes, the tool is completely free and requires no sign-up. You enter an address and immediately get the validation result and a quality score.
Validation confirms an address is correctly formed, at the format and writing-rules level. Verification goes further by trying to confirm that a mailbox exists and receives, which requires a server-side check. This tool handles format and quality validation instantly.
No. The format and quality validation runs in your browser, without sending any message. Nothing is sent to the address you check.
No. An address can be perfectly valid in format without a mailbox behind it. Confirming existence requires a server query (SMTP) or a real send. Format validation remains the essential first filter to catch typos.
An address is invalid if it breaks the writing rules: multiple @, a double dot, a space, a domain with no extension, or a too-short extension. The tool also flags likely domain typos and disposable addresses.
Gojiberry is an AI-powered, multi-channel prospecting platform. It tracks 30+ buying-intent signals across socials and the web, surfaces leads who are in-market right now, then triggers personalized outreach across channels. Where the validator makes the existing list reliable, Gojiberry generates new qualified contacts.
A valid list is nice. Qualified leads are better.
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