Proton Mail Email Signature Generator

Proton Mail operates differently from commercial email providers. The platform implements strict HTML sanitization to block tracking pixels, malicious scripts, and external resource requests. This means your signature's external stylesheets vanish. Font-face declarations disappear. Background images don't load. Proton Mail's webmail client recognizes only inline styles written directly into HTML elements using the style attribute. Even then, certain properties like position: absolute, z-index, and JavaScript event handlers get stripped. The result: your signature collapses. Colors vanish. Spacing breaks. Your logo appears as a broken image placeholder. SignatureFox solves this by embedding all images as base64 strings—long encoded data URLs that live inside the HTML itself, not on external servers. Your logo renders every time, on every device. The platform uses table-based layout with inline styles only. No external resources. No blocked requests. Proton Mail's privacy model actually works in your favor once you design within its constraints. Your signature loads faster because it carries zero external dependencies. Recipients never see tracking requests. And your branding stays intact across Proton Mail, Gmail, Outlook, and Apple Mail simultaneously.

Proton Mail's signature settings live in the account preferences, but the interface differs from Gmail's approach. You'll paste your HTML signature as raw code, not through a visual editor. SignatureFox delivers your signature as a complete HTML file and a step-by-step guide. Open your Proton Mail account and navigate to Settings > Signature. Proton Mail displays a text box labeled 'Signature.' This box accepts HTML. Paste your entire SignatureFox HTML file into this field. Don't edit it. Don't remove tags. Proton Mail's parser handles the rest. Test your signature by composing a new email. Send it to yourself or a colleague. Check how it renders in their inbox—this confirms whether images embedded properly and spacing survived. If you use multiple Proton Mail identities or aliases, repeat this process for each one. Proton Mail applies signatures per address, not globally. Desktop webmail and the Proton Mail app sync your signature automatically once saved. Mobile rendering may compress images slightly, but base64 embedding ensures they still display. Your signature persists even when Proton Mail updates its interface.