Email Validator
Validate a single email or paste a list for bulk validation. Checks format, TLD, and flags disposable domains — all in your browser.
About Email Validator
Invalid email addresses in a mailing list silently hurt deliverability metrics, inflate bounce rates, and can cause email providers to flag your sending domain as a spam source. Whether you are cleaning a marketing list, validating form submissions during development, or auditing a CRM database, the Email Validator lets you check individual or bulk email addresses in seconds.
The tool runs a practical set of structural checks: exactly one @ symbol, a non-empty local part with no spaces or illegal characters, a domain containing at least one dot, and a top-level domain of two to ten letters. It then compares the domain against a built-in list of twenty well-known disposable email services such as Mailinator, Guerrilla Mail and Yopmail. Every failure comes back with a specific reason — "Missing @", "Invalid TLD", "Disposable email domain" — so you can see exactly why an address was rejected instead of guessing.
In bulk mode, paste any number of email addresses (one per line) and validate the entire list in one operation. The results table lists each address with its status and the reason for any failure, above a running count of valid, invalid and total. From there you can copy just the passing addresses, copy just the failing ones, or export everything as a CSV to share with your team or import into your CRM. All validation runs locally in your browser — your email list is never transmitted to any server.
How to Use Email Validator
- 1For a single email: type or paste the address into the input field — it is checked automatically as you type, no button to press.
- 2Read the verdict under the field: a green check for a valid address, or a red cross with the exact reason it failed.
- 3For bulk validation: switch to the "Bulk" tab and paste your list of emails, one per line.
- 4Click "Validate All" to run the full check across every address in the list.
- 5Scan the results table — Email, Status and Reason — with the valid / invalid / total counts summarized above it.
- 6Use "Copy Valid" or "Copy Invalid" to lift one group straight to your clipboard, or "Download CSV" to export the whole report.
Use Cases
- →Clean a mailing list before an email campaign to minimize bounce rates
- →Validate user-provided email addresses during development before adding server-side checks
- →Audit a CRM or database export to identify and remove problematic addresses
- →Check if an email address appears legitimate before adding it to a contact list
- →Spot disposable addresses in a registration list — they are rejected with the reason "Disposable email domain"
- →Export a validation report as CSV to share with your marketing or data team
Tips
- ✓Paste one email address per line in Bulk mode for fastest processing
- ✓Download the CSV report to get a structured file you can open in Excel or Google Sheets
- ✓Twenty disposable domains — Mailinator, Guerrilla Mail, Yopmail and friends — are rejected automatically, with the reason spelled out
- ✓Format validation only checks syntax — it cannot verify that a mailbox actively exists
- ✓The TLD check tests shape, not registration: any two-to-ten-letter extension passes, so a typo like .comm still gets through
- ✓Combine with your ESP's list cleaning features for maximum deliverability improvement
- ✓Click "Copy Invalid" to pull every failing address out of the list in one go, ready to paste back into your ESP
Frequently Asked Questions
The validator checks for: presence of exactly one @ symbol, a non-empty local part (the text before @), a domain with at least one dot, a top-level domain of 2–10 alphabetic characters, no whitespace, and only valid characters in the local part. It also flags known disposable email domains.
No — this tool checks format and structure only, not whether a mailbox exists. Verifying a real inbox requires sending an email or querying the mail server's MX records, which would require a server-side call.
Paste one email per line in the Bulk tab and click "Validate All". Each address is validated independently and the results appear in a table showing the status (Valid or Invalid) and the reason for any failure.
Disposable email services provide inboxes that expire quickly and are often used to bypass registration requirements. This tool flags 20 of the most common ones — including mailinator, yopmail, and tempmail.
The downloaded CSV has three columns: Email, Status (Valid or Invalid), and Reason. Each field is quoted so that commas or special characters do not break the format.
No. All validation runs entirely in your browser using JavaScript. Your email addresses are never sent to any server. The tool works offline once the page has loaded.