Why Image Size Matters in Email
Email is one of the most size-sensitive channels for image delivery. Unlike websites where images load progressively, email clients download all images before rendering. Large images cause slow email loading, trigger spam filters, and get clipped by Gmail's 102KB email size limit.
For email marketing campaigns, image optimization directly impacts deliverability, open rates, and click-through rates. Emails that load slowly on mobile — where over 60% of emails are now opened — see significantly higher abandonment rates.
Email Image Size Recommendations
Step-by-Step: Optimize Images for Email
- Resize first: Use our Image Resizer to set width to 600px (standard email width). Height will adjust proportionally if aspect ratio is locked.
- Compress aggressively: Use our Image Compressor at 70–75% quality. Email images are viewed at small sizes, so quality loss is less noticeable than on a large monitor.
- Use JPEG format: Convert PNG images to JPEG using our PNG to JPG converter unless transparency is required.
- Remove metadata: Use our EXIF Remover to strip unnecessary metadata that adds file size.
- Check total email size: Aim for under 100KB total email size including all images and HTML.
Email Client Image Support
Not all email clients handle images the same way. Here's what you need to know:
- Gmail: Supports JPEG, PNG, GIF. Clips emails over 102KB. Caches images via Google proxy.
- Outlook: Supports JPEG, PNG, GIF. Does NOT support WEBP or CSS background images reliably.
- Apple Mail: Supports JPEG, PNG, GIF, WEBP. Generally the most capable email client.
- Mobile clients: Most support JPEG and PNG. Always test on mobile before sending campaigns.
The safest choice for maximum compatibility is JPEG for photos and PNG for logos/icons. Avoid WEBP in email despite its web performance advantages.
Privacy: Remove Location Data Before Sending
If you're sending photos taken on a smartphone, they may contain GPS coordinates embedded in the EXIF metadata. Before attaching photos to emails, use our EXIF Metadata Remover to strip this data. This is especially important for real estate photos, personal photos, or any image where location privacy matters.