Question 1

Is Mailglass Lite really free?

Accepted Answer

Yes, Mailglass Lite is 100% free forever. There are no premium tiers, no hidden costs, and no feature limitations. You can preview, validate, and export HTML emails without any payment.

Question 2

Do I need to create an account to use Mailglass Lite?

Accepted Answer

No account is required to use core features like HTML preview, validation, and PDF export. Optional sign-up unlocks additional features like cloud saves and sending test emails via your own email account.

Question 3

How do I test my HTML email for Outlook compatibility?

Accepted Answer

Mailglass Lite includes 10 Outlook-specific validation rules that check for common issues like white lines, CSS background images, margin/padding problems, and missing MSO conditionals. Simply paste your HTML and click Validate to see all Outlook compatibility issues with one-click auto-fix options.

Question 4

What is Gmail's 102KB email clipping and how do I avoid it?

Accepted Answer

Gmail clips (hides) emails larger than 102KB, showing a 'View entire message' link instead. Mailglass Lite displays your HTML size in real-time and warns you when approaching this limit. Use our Minify feature (⌘M) to compress your HTML and stay under the limit.

Question 5

Can I test how my email looks in dark mode?

Accepted Answer

Yes, Mailglass Lite includes a dark mode preview toggle that simulates how email clients render your email in dark mode. It also validates for dark mode issues like pure black/white colors and transparent images that may cause problems.

Question 6

Is my HTML code secure when using Mailglass Lite?

Accepted Answer

Yes, Mailglass Lite is privacy-first. Your HTML code is processed entirely in your browser and never sent to our servers. The app even works offline after the initial load.

Question 7

How does the AI email generator work?

Accepted Answer

Our AI email generator uses GPT-5-mini to create professional HTML emails from text descriptions. You get 3 free AI credits on signup. Simply describe your email (e.g., 'Black Friday sale announcement with 50% discount') and the AI generates responsive, email-client compatible HTML with one of 12 professional layout archetypes.

Question 8

What email clients does Mailglass Lite validate for?

Accepted Answer

Mailglass Lite validates your HTML against 43 rules covering Outlook 2007-2019, Outlook 365, Gmail (desktop and app), Apple Mail, iOS Mail, Yahoo Mail, Samsung Email, and more. Each rule identifies specific compatibility issues and offers auto-fix suggestions.

Question 9

Can I send the created emails directly from Mailglass Lite?

Accepted Answer

Yes, you can send the created emails using your Google or Microsoft account via OAuth. No SMTP configuration needed. Simply sign in, enter recipient addresses (or import from CSV), and send test emails to check rendering in actual email clients.

Question 10

How do I make my HTML email accessible?

Accepted Answer

Mailglass Lite includes accessibility validation rules that check for missing alt text on images, proper table roles, minimum font sizes, and meaningful link text. Our auto-fix feature can add these accessibility improvements with one click.

Preview Emails on Every Device

Key Capabilities

Three Viewports

Real-Time Updates

Device Frames

Link Testing

Try Responsive Email Preview Now

Ready to Test Your Emails?