Welcome
FreeA three-email welcome series built in MJML. Built for Outlook, Gmail and Apple Mail, and it holds up in dark mode.
- Outlook
- Gmail
- Apple Mail
light / dark inbox · desktop and mobile
live preview →HTML email check
Paste the HTML — see it at desktop and phone width, get the tags Outlook and Gmail won't understand with line numbers, and the weight against Gmail's clipping limit. No signup, no limits.
Your HTML
result
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Why emails break in Outlook
Desktop Outlook on Windows renders email with the Word engine, not a browser one, and everything else follows from that: flexbox and grid are ignored, negative margins collapse, a background image on a block is not drawn without VML, and padding on a div may simply not apply. That is why reliable email markup is tables, inline styles and conditional comments for Outlook.
What the tool checks
Markup for unsupported properties and elements, email weight against Gmail's clipping threshold, alt text and explicit sizes on images, the width of the main table, and whether there is an unsubscribe link. Everything runs in the browser: the HTML is never uploaded.
What it cannot do
It does not render your email inside Outlook or Gmail — the preview is a browser render at 600 and 360 px. It catches the known-to-break patterns; for a pixel-exact view of each client you still need the clients themselves or a rendering service.
If you'd rather not dig
Take a ready template. Ours are built from MJML into the table-and-VML structure Outlook expects, and the free versions download without signup.