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Slack Emoji Size Guide: Create Perfect Custom Emojis

Need to create a custom emoji right now? Use our Slack Emoji Creator to get perfectly sized emojis instantly.

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Slack Emoji Size Requirements

  • Maximum Dimensions: 128x128 pixels
  • Recommended Size: 64x64 pixels
  • Maximum File Size: 128 KB
  • Supported Formats: PNG, GIF (static & animated), JPG
  • Aspect Ratio: 1:1 (square)

Optimal Emoji Dimensions

While Slack accepts images up to 128x128 pixels, we recommend using 64x64 pixels for the best balance of quality and performance. Here's why:

  • Better loading performance in Slack
  • Crisp appearance in messages
  • Consistent size with default emojis
  • Smaller file size

File Format Guidelines

PNG Format (Recommended for Static Emojis)

  • Best for images with transparency
  • Sharp edges and clear text
  • No quality loss in compression
  • Perfect for logos and icons

GIF Format (For Animated Emojis)

  • Supports animation
  • Keep under 50 frames for best performance
  • Optimize animation speed
  • Compress to reduce file size

JPG Format

  • Suitable for photographic images
  • Smaller file sizes
  • No transparency support
  • Best for complex color gradients

Related Guides

Pro Tips

  • Always test your emoji in both light and dark Slack themes
  • Consider using transparent backgrounds for better compatibility
  • Keep animations short and subtle for professional use
  • Use vector sources when possible for sharper results

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