Free tool
Email signature checker
Paste your signature's HTML to find problems that break it in Outlook and Gmail or make spam filters suspicious. Checks run in your browser — nothing is uploaded.
Results appear here: size limits, hosted images, alt text, https links, scripts, inline styles, Outlook-safe layout and text-to-image balance.
Start from a clean signature
Signavique's builder produces table-based, inline-styled HTML designed for Outlook, Gmail and Apple Mail.
Open the builderA score is a guide based on common email client behaviour, not a guarantee of delivery.