Free Email Validator — Bulk Validate Email Addresses Online
Email Validator checks each address against RFC-style syntax rules, verifies domain shape, and flags disposable mailbox providers, role accounts (info@, support@) and plus-tagged aliases — all computed locally without transmitting your list. Validate your entire list before you hit send.
- 100% in your browser
- No signup · no uploads
- Free to use
drop files here
Results
Nothing processed yet. Add content above and press the action button — everything runs locally in this tab.
History
Optionally remember runs on this device, sealed with your passphrase. Off by default; entries expire after 30 days.
Expires after 30 days; forgetting the passphrase erases access permanently.
How it works
- 01
Add your content
Paste text or drop TXT, CSV, XLSX, DOCX and PDF files into the workspace.
- 02
Run the tool
One press runs the pipeline locally in a Web Worker. Change the options and results update automatically.
- 03
Copy or download
Export results as TXT, CSV or JSON. Your content is never uploaded.
What offline validation can tell you
This validator performs static checks only: RFC-style syntax (exactly one @, valid local and domain labels, a plausible top-level domain), domain-shape sanity, plus curated classifications for disposable mailbox providers and generic role accounts like info@, support@ and admin@. Plus-addressed aliases (user+tag@domain) are reported as informational, not as failures.
Those checks catch the errors that cause instant bounces and wasted sends — double-@ typos, missing TLDs, spaces inside addresses, throwaway domains used for one-time signups. What they cannot do is confirm a mailbox exists, accepts mail, or belongs to the person you expect. That requires DNS, MX and SMTP probing, which default validation deliberately never performs. The disposable-provider list itself is maintained weekly from community-maintained sources, so newly launched throwaway services are picked up in regular releases.
Reading the verdicts: valid, risky, invalid
Valid means the syntax is sound and no risk list matched — safe to keep, still not a deliverability guarantee. Risky means the syntax is fine but the address is a known disposable provider or a role account; decide by context. A newsletter can tolerate some role accounts; a cold-outreach sequence usually should not. Invalid means the string cannot be a deliverable address as typed and should be fixed at the source or removed.
Treat risky as a strong signal, not a verdict. Disposable blocklists chase a moving target — new services appear constantly — and some companies legitimately use role addresses as their public contact. Segment risky addresses into a separate send or a re-confirmation flow rather than deleting blindly.
- Valid → keep; still warm up and monitor bounces on first send
- Risky (disposable) → quarantine or require re-confirmation
- Risky (role) → fine for transactional mail, weak for personal outreach
- Invalid → fix at source or drop; never guess corrections
Why no test emails or server pings
Sending probe emails or opening SMTP connections to validate addresses burns your sender reputation, trips rate limits and greylisting, and leaks your prospect list to third-party infrastructure. This validator's offline design is the point: your list never leaves the tab, no request carries its contents, and nothing you do here can get your domain blocklisted.
If you need mailbox-existence confirmation for a high-stakes send, use a dedicated server-side verification service on a small, already-cleaned subset — after running this validator first to shrink the billable volume and after obtaining proper consent for the send itself.
Validation workflow before any campaign
Clean first, then validate, then act on the counts. A typical content-download list might show 85% valid, 10% risky, 5% invalid; a scraped or purchased list often inverts that. Export the valid slice for the main send, hold risky addresses for a confirmation pass, and investigate invalid clusters — a burst of identical typos usually means one broken form field, not hundreds of bad users.
For an extra deliverability signal, the validator offers an optional mail-server check: one click looks up each domain's MX records over DNS-over-HTTPS and demotes valid addresses whose domains accept no mail to risky. Only domain names leave the tab — never addresses or list contents — and unreachable DNS never changes a verdict, so the check is safe to run on any list.
Re-validate on a schedule, not just once. Domains expire, people abandon inboxes, and disposable share drifts upward over time. Pair validation with the Analyzer periodically to watch provider mix and role-account share as early warnings.
Last reviewed: 2026-09-06 · By the Email Extractor Team · About our privacy-first approach · Reference data: 2026-09-06 · 8,735 known throwaway domains
Keep reading
Frequently asked questions
Does this send a test email or ping servers?
By default, never. Validation performs static checks — syntax, domain shape and known-list classification — entirely offline. An optional “Check mail servers” button can look up MX records over DNS-over-HTTPS; it sends only domain names, never addresses or list contents, and only runs when you click it.
What makes an address 'risky'?
Risky means the syntax is fine but the address is a known disposable provider or a generic role account such as info@ or admin@. Plus-tags are shown as an informational flag and do not make an address risky by themselves.
How accurate is disposable detection?
It uses a curated blocklist of popular temporary-mail services, folded across subdomains. New services appear constantly, so treat 'risky' as a strong signal rather than a guarantee.