What Does This Tool Do?

At a functional level, this tool analyses each email address you paste and determines whether it is syntactically valid based on a strict pattern. It does not ping mail servers or perform DNS checks; instead, it focuses on the correctness of the email format.

Behind the scenes, it:

• Splits your input so each line is treated as one email.
• Applies a validation rule that checks for a proper username,@ symbol, domain name, and top-level domain.
• Filters out addresses with obvious issues like missing parts, double dots, disallowed characters, or clearly broken syntax.
• Separates the results into two groups: valid and invalid emails.
• Presents counts and lists so you can quickly see how clean your data is and take action.

The goal is to give you a fast, browser-based way to sanity-check an email list before you use it anywhere important.

Why Would You Need To Use This?

Poor-quality email lists lead to bounced messages, poor engagement, and damaged sender reputation. Before uploading lists into email platforms or CRMs, it is smart to remove clearly invalid entries.

This tool is especially useful when you are:

• Preparing email marketing campaigns and want to avoid wasting sends on broken addresses.
• Cleaning up old CRM exports or subscriber databases that may contain user typos.
• Validating CSV lists you received from events, forms, or lead sources before importing them into tools like ESPs or marketing automation platforms.
• Testing and QA-ing signup forms to make sure your validation logic behaves as expected.
• Quickly separating obviously incorrect entries from a mixed list before performing more advanced verification steps.

Using this validator as a first pass keeps your lists cleaner from day one and reduces risk when sending to new or imported contacts.

How To Use This Tool (Step-by-Step)

1. Collect your emails: Make sure each email address is on its own line (for example, copied from a spreadsheet column or text file).
2. Paste into the input box: Insert your list into the Email Addresses (one per line) area.
3. Click "Validate Emails": The tool will process each entry and mark it as valid or invalid based purely on format.
4. Review the summary: Check the counts for how many addresses passed or failed the validation rules.
5. Scroll through details: View the separate lists of valid and invalid addresses shown below the counts.
6. Export as needed: Use the Copy Valid and Copy Invalid buttons to copy each list to your clipboard, then paste them into your email platform, spreadsheet, or cleaning workflow.

You can run the validation multiple times after editing or correcting invalid entries to gradually improve the overall quality of your list.

Best For:

• Email marketing & campaign preparation
• Cleaning CRM or subscriber databases
• Signup form verification and QA testing
• Bulk list validation before import/export
• Filtering spam or invalid user entries

Privacy & Safety

All processing happens securely in your browser. We do not store or transmit any email addresses to servers – your list remains private and fully under your control.

Still, you should avoid testing highly confidential or regulated user data where strict privacy laws apply.

Disclaimer

This tool validates only the email format and basic structure. It does not guarantee inbox activity, domain reputation, or the real existence of the mailbox. For mission-critical addresses, always confirm via user opt-in, double confirmation, or professional deliverability services.