Make your template land in the inbox

Drag-and-drop builders ship HTML that breaks in Outlook, drops below WCAG, or trips Gmail into Promotions. Catch every one before you hit send, then fix it in a click.

  1. 1Paste your HTML below
  2. 2Get a score and a fix list
  3. 3Fix it yourself or let AI do it
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Here's what we check

Paste your HTML and we'll run 62 checks across 4 categories, flagging anything that lands you in spam, breaks the render, or fails accessibility.

Deliverability12checks
  • Unsubscribe link present
  • Physical postal address present
  • HTML under 102KB Gmail clip limit
  • No mixed-script (homoglyph) words
  • No HTML entity obfuscation
  • No hidden text or keyword stuffing
  • No insecure http:// images
  • Healthy image-to-text balance
  • Enough text around each image
  • No social-icon overload
  • Has a preheader (inbox preview text)
  • No 1×1 tracking pixels
+8 more
Links9checks
  • No "@" in URL hostname (phishing exploit)
  • No punycode/IDN hostnames in links
  • Anchor text matches link domain
  • No empty / placeholder / javascript: hrefs
  • At most 9 links (no link-farming)
  • No public URL shorteners
  • Healthy link density
  • URL length within limits
  • No duplicated URLs (link-farm pattern)
+5 more
Content16checks
  • No zero-width or soft-hyphen characters
  • No spam trigger phrases
  • Sufficient text contrast (WCAG AA)
  • No stacked currency symbols
  • No raw debug/tracking ID visible in body
  • Email length under 5000 words
  • No ALL CAPS shouting
  • Font size at least 12px
  • No excessive exclamation marks
  • No excessive punctuation in headings
  • Web-safe font family
  • No harsh red/green CTAs
  • Comfortable line-height (≥ 1.2)
  • No bold + italic on whole phrases
  • Avoid pure white email background
  • No broken symbols left to replace
+12 more
HTML / render25checks
  • No drag-and-drop builder bloat
  • No JavaScript event attributes
  • No <script> tags
  • No <form> tags
  • No base64-embedded images
  • No email-unsupported CSS (position/flex/grid/transform)
  • No external stylesheets
  • <!DOCTYPE html> declared
  • <meta charset> declared
  • No background image on <body>
  • Email width 600 to 800px
  • No deprecated tags (center/font/marquee)
  • No excessive <div> nesting
  • Background colors render across clients
  • Images have width and height
  • All images have alt text
  • No <br> stacks
  • Outlook-safe image styling
  • <table> resets for Outlook
  • No margin on <div> / <p>
  • No <button> tags (use table-buttons)
  • CTA buttons have Outlook fallback
  • Declares dark-mode color-scheme
  • Well-formed HTML
  • No <style> blocks
+21 more