Local-only / No Server Needed Local-only

Fix your broken Outlook signatures instantly

The local-first HTML transpiler, cleaner, and extractor for bulletproof emails.

Drop HTML file here

Or paste your signature code

Microsoft Outlook
To: recipient@example.com
Subject: Email with signature preview

Hi there,


This is a test email to preview your signature.


Best regards,


The Ugly Truth

Why does Outlook always break your signatures?

Outlook doesn't use a browser engine to render emails. It uses the Microsoft Word Rendering Engine — the same technology that powers your Word documents.

That means every modern CSS feature you rely on is silently ignored. display: flex does nothing. gap disappears. border-radius gets stripped. Even max-width is misinterpreted.

The only reliable layout method is deeply nested HTML tables with inline styles, VML shapes for backgrounds, and <!--[if mso]> conditional comments that modern browsers never see. Writing this by hand is painful. SigFix generates it automatically.

Visual Proof

What Outlook actually sees

Broken in Outlook
<div style="display:flex;gap:16px">
  <img class="avatar">
/* Outlook ignores flex — layout collapses */
Fixed by SigFix
<table role="presentation"><tr>
  <td valign="middle" width="88">
/* Works in every Outlook version ✓ */
Knowledge Base

HTML Signature Cookbook

Real-world fixes for the most common Outlook signature problems.

Image Too Large in Outlook

Your avatar or logo renders at full resolution and breaks the layout. Outlook ignores CSS width — only HTML attributes work.

Read solution →

Flexbox Layout Collapses

Avatar-left / text-right built with display: flex stacks vertically in Outlook. The Word engine doesn't understand flex containers.

Read solution →

Styles in <style> Tag Ignored

CSS classes defined in a <style> block at the top of the signature are stripped entirely. All styles must be inlined.

Read solution →

Centering with margin: auto Fails

margin: 0 auto and max-width are two of the most common Outlook offenders — the table stays left-aligned no matter what.

Read solution →
How It Works

Three steps to an unbreakable signature

01

Paste

Drop in broken HTML, an AI-generated snippet, or raw text copied from an email. Any format is accepted.

02

Fix

Our local engine rebuilds the DOM tree to MS Word standards in under 1ms — inlining CSS, converting Flexbox to tables, and adding MSO shims.

03

Copy

Grab the bulletproof HTML source or copy Rich Text directly into your email client's signature settings — images, links, and formatting intact.

Pricing

One price. Yours forever.

Free Plan
$0 forever
  • 3 signature fixes per day
  • Access to AI Transpiler mode
  • Copy Outlook-safe HTML code
  • Local-first browser processing
Use for Free
Lifetime Access
$14 one-time payment
  • UNLIMITED signature fixes forever
  • Access to ALL modes (Transpiler, Cleaner, Extractor)
  • Instant One-Click Rich Text copying (No code needed)
  • Never pay monthly subscriptions
  • Support independent indie development
Who is this for? Sales teams  ·  Recruiters  ·  Agencies  ·  Founders

Processed by Paddle  ·  30-day refund guarantee

Zero server processing

Your data never leaves your browser. All HTML parsing, CSS inlining, and DOM restructuring happens locally on your machine. We can't see your signature — and we never will.

No uploads No accounts No telemetry Works offline
FAQ

Common questions

Why does Outlook break HTML email signatures?

Outlook for Windows uses the Microsoft Word rendering engine — not a browser — to display email content. This means modern CSS properties like display: flex, grid, gap, border-radius, and max-width are either ignored or misinterpreted. The only reliable layout method is nested HTML tables with fully inline styles.

How do I create an Outlook-compatible email signature?

The signature must be built using HTML tables for layout, with all styles inlined directly into the elements — no external stylesheets, no <style> blocks. Images need explicit width and height HTML attributes. For advanced layout, MSO conditional comments (<!--[if mso]>...<![endif]-->) can be used. SigFix handles all of this automatically.

Does Outlook support Flexbox or CSS Grid?

No. Outlook 2013–2021 and Outlook on Windows completely ignore display: flex and display: grid. SigFix's AI Transpiler detects all flex containers and automatically converts them into equivalent <table> structures with proper valign and width attributes that Outlook understands.

Is SigFix a subscription?

No. SigFix is a one-time payment of $14 for lifetime access. No monthly fees, no renewal reminders, no surprise charges. You pay once and the tool is yours for as long as the product exists. Payments are processed securely by Paddle.com with a 30-day refund guarantee.