Email Validator
Validate single or bulk email addresses against RFC 5322 rules. Detects format errors, invalid domains, and common typos like gmial.com or hotmal.com.
Enter an email address to validate it.
What is Email Validation?
Email validation is the process of checking whether an email address is correctly formatted according to internet standards (RFC 5321 and RFC 5322). A valid email consists of a local part, an @ symbol, and a domain with a valid top-level domain (TLD). This tool performs client-side syntax validation only — it does not send any network requests or confirm whether a mailbox actually exists.
What Gets Validated?
The validator checks eight rules for each email: presence of exactly one @ symbol, absence of spaces, no consecutive dots, a total length of at most 254 characters, a valid local part (at most 64 characters using RFC-allowed characters), a valid domain (labels separated by dots, hyphens allowed but not at start/end), and a TLD of at least two alphabetic characters.
Typo Detection
A common source of invalid emails is a simple domain typo — for example typing gmial.com instead of gmail.com, or hotmal.com instead of hotmail.com. This tool detects the most frequent domain typos and suggests the correct spelling so users can fix their address before submitting a form.
Bulk Email Validation
Switch to Bulk mode to validate entire mailing lists at once. Paste up to hundreds of addresses (one per line), and the tool instantly shows a results table with the status and issue for each entry. Use the copy buttons to extract only the valid or only the invalid addresses for further processing.
About This Tool
The Email Validator is a free online tool available on CodeUtilo. Validate email address format and syntax. Check for common mistakes and typos. All processing happens directly in your browser — no data is ever sent to any server, ensuring your privacy and security. No signup or installation is required.
Key Features
- Browser-Based Processing — All email validator operations run locally in your browser using JavaScript. Your data never leaves your device.
- Instant Results — Get results immediately as you type or paste your input. No waiting for server responses or page reloads.
- Free & No Signup — Use the email validator as many times as you need without creating an account or paying anything.
- Mobile Friendly — Works on desktop, tablet, and mobile browsers. Access this tool from any device with an internet connection.
Common Use Cases
- Using the email validator for day-to-day development tasks
- Saving time on repetitive tasks by using a browser-based tool instead of writing custom code
- Working on projects where installing software is not an option (school, work, shared computers)
- Quick prototyping and debugging without switching to a terminal or IDE
- Sharing the tool link with colleagues who need the same functionality
How to Use
Enter your input in the text area provided and the email validator will process it instantly. Use the Copy button to copy the result to your clipboard. All operations are performed locally in your browser — no data is transmitted to any server.
Frequently Asked Questions
Is the Email Validator free to use?
Yes, the Email Validator is completely free with no usage limits. There is no signup or registration required. You can use it as many times as you need.
Is my data safe when using this tool?
Yes. All processing happens locally in your browser using JavaScript. Your data is never uploaded to any server or stored anywhere. Everything stays on your device.
Does this tool work on mobile devices?
Yes. The Email Validator is fully responsive and works on smartphones, tablets, and desktop computers. You can use it from any modern browser on any device.
Do I need to install anything?
No. The Email Validator runs entirely in your web browser. There is nothing to download or install. Just open the page and start using it immediately.
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