Image Optimization and Compression Guide

How to Optimize Images for Email

Large or improperly formatted images can slow down email loading and affect deliverability. Follow this guide to optimize your images before uploading.

When You Need to Optimize Images

• Your image file size is over 1 MB
• Images load slowly in test emails
• Your image dimensions exceed 800px wide

Step-by-Step Compression Process

Method 1: Using TinyPNG (Recommended)

1. Go to TinyPNG.com
2. Upload your image
3. Download the compressed version
4. Upload to ContactMonkey

Method 2: Using Adobe Photoshop or Similar Software

1. Open your image in your editing software
2. Resize to 750px wide (maintains quality while meeting guidelines)
3. Set the resolution to 72 PPI
4. Save as JPG or PNG
5. Upload to ContactMonkey

Header Image Best Practices

• Keep header images wider than they are tall (horizontal orientation)
• Vertical headers may fill the entire mobile screen, hiding email content
• Use vector editing software for logos and graphics to maintain quality
• Test header appearance on mobile devices before sending

Quality vs. File Size Balance

• Start with high-quality source images
• Compress in small increments to find the right balance
• Always preview compressed images before using in emails

See Also

• Image Requirements and Specifications
• Using ContactMonkey's Image Resizing Features