Email checker online - zero friction

Verify email addresses in seconds with Email Checker Online

Run instant checks with SMTP and MX lookups, catch-all detection, and accurate SPF validation. Clean full lists and ensure deliverability.

Start single check Validate a list View API

99.9%

SMTP accuracy

1000

Emails per batch

GDPR

Consent friendly

Queue-friendly design, caching, and lightweight UI so bulk runs stay fast.

Bulk email checker online

CSV + TXT

Upload a CSV or paste up to 1000 emails per batch. Get a clean report with valid, risky, and invalid statuses plus DNS notes.

File uploads with optional column picker
Progress updates and CSV export
Disposable domain filter and catch-all detection

Open bulk checker

API and automation

REST

Plug the email checker online into forms, CRMs, and signup flows. Straightforward JSON responses and friendly rate limits.

Single and bulk endpoints with status tracking
HTTPS by default, CORS enabled for web apps
Fast responses with sensible caching

Read API docs

How it works

Three-step validation flow

Try now

Syntax and DNS

RFC-compliant parsing and MX discovery to ensure the domain is prepared to receive mail.

SMTP handshake

Lightweight connection attempts with timeouts to confirm the mailbox is reachable without sending mail.

Result and export

Clear statuses (valid, risky, invalid), reasons, and export-ready CSV for your marketing or product stack.

Frequently asked questions

Is Email Checker Online really free?

Yes. The email checker online is free for single checks and reasonable bulk batches so you can clean lists without friction.

Do you store validated emails?

No. Checks run in-memory and results are returned to you; we do not persist email addresses.

What makes results reliable?

We combine syntax validation, MX records, SMTP handshake, disposable domain filtering, and catch-all detection to reduce false positives.

Can I automate validations?

Yes. Use the REST API for single and bulk endpoints, or trigger checks from forms and CRMs via simple HTTP calls.

Latest from the Blog

What is an SPF Record?

Learn why SPF records are crucial for your email deliverability and how to set them up.

MX Records: The Backbone of Email

Understanding how Mail Exchange records work and how to troubleshoot them.

View all articles →

Fast page load, semantic HTML, and required policy pages are in place.

SEO hygiene

Clean meta tags, canonical URLs, sitemap, robots, and structured data that mention email checker online.

Privacy and consent

Cookie banner with opt-out, privacy and cookie policies, and no hardcoded secrets.