Free tool by Warmy

Email Accessibility Checker

Q: Where do I get my email HTML?

Use the export HTML or download HTML option in your email builder or email platform. Paste the code here, or import the .html file. A screenshot or email header is not the email HTML.

Q: Is my email uploaded or saved?

No. The check runs in your browser. Email HTML is not uploaded or saved by this tool, and remote images are blocked in the preview.

Q: Does a score of 100 mean my email is fully accessible?

No. The score is guidance based on automated checks and email best practices, not an accessibility certification. Meaningful image descriptions, reading order, image-based text and email-client behavior still need human testing.

Q: What contrast ratio should email text meet?

WCAG AA requires at least 4.5:1 for normal text and 3:1 for large text. Automatic measurements that cannot resolve a background reliably are marked for manual review.

Q: Can this simulate Gmail or Outlook dark mode?

No. The preview is a browser rendering, not an email-client simulation. The checker identifies dark-mode declarations and styles; always test the actual email in your target inboxes.

Make every email easier to read. Check your HTML for accessibility issues and see what to improve before you send.

Alt text & contrast
Clear, actionable fixes
No sign-up needed

Email HTML

Only in your browser. Nothing uploaded or saved.

From HTML to a clearer email

1. Add your email
Paste the HTML exported from your email platform, or import the HTML file.
2. Review the findings
See issues by category, inspect the HTML and preview the email at desktop or mobile width.
3. Fix and test
Apply the suggested changes in your editor, rerun the check and finish with a real-inbox review.

FAQ

Email Accessibility
Questions, Answered

What does the email accessibility checker test?

It checks image alternatives, text contrast, language and structure, links, readability and dark-mode signals. Each finding includes the relevant HTML and a suggested next step.

Where do I get my email HTML?

Is my email uploaded or saved?

Does a score of 100 mean my email is fully accessible?

What contrast ratio should email text meet?

Can this simulate Gmail or Outlook dark mode?

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Success stories

Real senders, real numbers

All success stories

Lead generation

ActiScale

ActiScale sells cold email as a service to B2B companies with high-ticket offers. When deliverability dropped in October 2025, the team moved its warm-up to Warmy.

Mailboxes stopped burning at the previous sending rate.
More emails sent per mailbox, so fewer mailboxes were needed.

“If you do cold email, Warmy will increase your efficiency, improve your deliverability, and cut your costs.”

Thomas Tzouridis
CEO of ActiScale

Technology

Cloud Tech Gurus

Cloud Tech Gurus has used Warmy for over a year. Deliverability moved from a 65% to 80% range up to 98%, and email that once felt like wasted effort started bringing in clients.

Deliverability rose from a 65% to 80% range to 98%.
Open rates moved from below 10% to between 25% and 35%.

“Warmy has been a game changer for us. The platform pays for itself many times over.”

Darren Prine
Co-founder and CRO, Cloud Tech Gurus

IT services

CloudStack Networks

Gregg Gibbons sends around 200,000 emails a month to schools, local governments and small businesses. Warmy gives him warm-up volume that matches that scale, plus a team watching deliverability alongside him.

Summer, which used to go nearly silent, now keeps producing responses and new business.
Provider-specific delivery problems flagged in real time, such as Google-hosted accounts going dark.

“I'll keep the service until I shut the doors because, if you're doing email marketing, you simply can't operate without it.”

Gregg Gibbons
IT Implementation Strategist, CloudStack Networks