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Gmail 128KB Size Limit: A Technical Deep Dive

·8 min read·Technical Guide
Master the art of email optimization to ensure your messages are delivered completely and effectively to Gmail users.
Email Size Optimization

Quick Summary

The Challenge

Gmail clips emails larger than 128KB, potentially hiding important content from your recipients.

The Solution

Implement optimization techniques to keep your emails under the limit while maintaining quality.

Understanding the Impact

Performance

Faster loading times and improved email client performance

Deliverability

Better inbox placement and reduced spam folder risk

Engagement

Higher open rates and click-through rates

Key Optimization Techniques

1. HTML & CSS Optimization


<!-- Optimized Structure -->
<table role="presentation" width="100%" cellspacing="0" cellpadding="0">
  <tr>
    <td align="center" style="p:20px">
      <h1 style="m:0;color:#000;font-size:24px">
        Welcome!
      </h1>
    </td>
  </tr>
</table>
  • Minify HTML and CSS
  • Use inline CSS for better compatibility
  • Remove unnecessary attributes and comments

2. Image Optimization

Format Selection

  • JPEG: Photos and complex images
  • PNG: Logos and text-based graphics
  • SVG: Icons and simple graphics

Compression Tips

  • Use lossy compression for photos
  • Optimize dimensions for email
  • Consider image CDNs

Best Practices Checklist

  • Test email size before sending
  • Optimize all images
  • Minify HTML and CSS
  • Remove unused code
  • Use inline CSS
  • Test across email clients

Recommended Tools

Code Optimization

  • HTML Minifier
  • PurgeCSS
  • Email Framework

Image Optimization

  • TinyPNG
  • ImageOptim
  • Squoosh
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