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

Choose your plan

Unlimited preview for everyone. Unlock copy with Pro.

Annual Pro
$12 / year

Billed annually. Cancel anytime.

  • UNLIMITED signature fixes
  • Access to ALL modes
  • One-Click Rich Text copying
  • Priority email support
Already PRO?
🏆 Best Value
$14 one-time payment

Pay once, use forever. No recurring fees.

  • UNLIMITED signature fixes forever
  • Access to ALL modes (Transpiler, Cleaner, Extractor)
  • Instant One-Click Rich Text copying
  • Never pay monthly subscriptions
  • Support independent indie development
Who is this for? Sales teams  ·  Recruiters  ·  Agencies  ·  Founders

Processed by Paddle  ·  14-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

Can I try SigFix for free?

Yes! Creating, fixing, and previewing your signatures in the live Outlook view is 100% free and unlimited. You only pay to unlock the instant copy/export features.

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?

SigFix offers two Pro plans: Annual Pro at $12/year (auto-renewing subscription, cancel anytime) and Lifetime Pro at $14 one-time (no recurring charges). Both unlock the same Pro features. Payments are processed securely by Paddle.com with a 14-day refund guarantee.