Free Outlook Signature Generator

Outlook is the trickiest email client for signatures — so we built Sigline's output specifically to survive it. Design yours free, paste it in, and it renders correctly on Outlook desktop, web, and mobile.

Why Outlook signatures break (and how we fix it)

Here's the thing most signature tools won't tell you: Outlook on Windows doesn't render HTML like a browser. It uses Microsoft Word's rendering engine, which ignores modern CSS — no flexbox, no rounded corners on divs, flaky padding. Signatures built with modern web techniques fall apart in Outlook while looking fine in Gmail. Sigline generates old-school table layouts with 100% inline styles — the only approach that renders consistently across Outlook desktop, Outlook on the web, Gmail, and Apple Mail. You get a modern-looking signature built on battle-tested email HTML.

Add your signature to Outlook on the web

Build your signature in Sigline and click Copy signature.
In Outlook on the web, click the gear icon → Mail → Compose and reply.
Under "Email signature," click inside the editor and paste (Ctrl/Cmd + V).
Set your defaults: signature on new messages, on replies/forwards, or both.
Click Save. Your signature now appears automatically.

Add your signature to Outlook desktop (Windows/Mac)

Copy your signature from Sigline as above.
In Outlook, go to File → Options → Mail → Signatures (Windows) or Outlook → Settings → Signatures (Mac).
Click New, name your signature, then paste into the editor.
Choose it as the default for new messages and replies under "Choose default signature."
Click OK to save.

Tips for bulletproof Outlook signatures

Keep the width under 600px. Outlook's reading pane is narrow; wide signatures get awkwardly cropped.
Avoid web fonts. Outlook substitutes them anyway — stick to Arial, Georgia, or Verdana in your signature design.
Host images, don't attach them. Large attached images trigger Outlook's image blocking; Sigline embeds your photo properly.
Test by emailing yourself. Open the test email in Outlook desktop if you can — that's the harshest renderer and the one that matters.
One signature per account. If you use multiple inboxes in Outlook, set the signature on each one separately.

A signature Outlook can't break

Table-based HTML, inline styles, tested rendering — free, no account needed.

Create my free signature