Email Image Size Limits
Most email providers have attachment size limits:
- Gmail: 25MB total
- Outlook: 20MB total
- Yahoo: 25MB total
- Apple Mail: 20MB total
For inline images, keep files under 200KB for fast loading in email clients.
How to Resize Images for Email
Step 1: Upload Your Image
Go to the Image Resizer and upload your image.
Step 2: Set Email-Friendly Dimensions
For inline images:
- Email signature: 200×200 pixels
- Newsletter header: 600×200 pixels
- Product image: 400×400 pixels
- Full-width banner: 600×300 pixels
Step 3: Compress for Email
Use the Image Compressor to target:
- Inline images: 20-50KB
- Attachments: Under 1MB each
Step 4: Choose Format
- JPEG: Best for photos (smallest files)
- PNG: Use only if transparency is needed
- GIF: For simple animations
Email Image Best Practices
1. Keep inline images under 100KB — Ensures fast loading in all email clients
2. Use JPEG for photos — Smaller files than PNG
3. Set explicit width/height — Prevents layout shifts in email clients
4. Include alt text — Many email clients block images by default
5. Don't rely on images alone — Include text versions of important content
6. Test across email clients — Gmail, Outlook, Apple Mail render differently
Frequently Asked Questions
What size should email images be?
For inline images, keep width under 600 pixels and file size under 100KB. For attachments, aim for under 1MB each.
How do I reduce image size for email?
Use the Image Resizer to set smaller dimensions, then the Image Compressor to target specific file sizes. JPEG format provides the smallest files for photos.
Which format is best for email images?
JPEG is best for most email images — it provides the smallest file sizes. Use PNG only if you need transparency.