An oversized image in your email signature causes problems: slow email loading, broken layouts, messages flagged as spam, and unprofessional appearance. Getting the image right - size, format, compression - takes two minutes and solves all these issues.
Recommended Dimensions
- Logo: 200-300px wide, height proportional
- Headshot: 80-100px wide (square or circular)
- Banner: 600px wide maximum, 100px tall
Use the Resize tool to set exact dimensions. Keep the aspect ratio locked to avoid distortion.
File Size Target
Email signature images should be under 50KB. Ideally under 20KB. Large images cause:
- Slow rendering in email clients
- Blocked images by default (many clients block large embedded images)
- Increased spam scores (heavy emails look suspicious)
Format Choice
- PNG: Best for logos with transparency or text with sharp edges
- JPEG: Best for headshots and photos (smaller file size than PNG for photos)
- Avoid: WebP, AVIF, SVG - email client support is inconsistent
Workflow
- Resize to target dimensions (e.g., 200px wide for logo)
- Compress - JPEG at 80 for photos, PNG for logos
- Strip metadata - removes hidden data and reduces file size
- Target: under 30KB final file
Conclusion
A properly sized email signature image loads instantly, renders correctly across clients, and looks professional. The Resize and Compress tools get you there in under a minute, all in your browser.
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Try it yourself
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