Substack Social Preview Image Size Guide (2025)
Creating the perfect Substack social preview image requires knowing the correct dimensions to maximize visual impact on social media and ensure your image displays properly across platforms. This guide walks you through the ideal Substack social preview image dimensions for 2025 and how to ensure your post previews make the best impression when shared.
Recommended Substack Social Preview Image Dimensions (2025)
- Image Size: 1456 x 1048 pixels
- Aspect Ratio: 14:10 (approximately 1.39:1)
- File Size Limit: Under 10MB (PNG, JPG or GIF formats supported)
- Minimum Size: 420 x 300 pixels (though we recommend the full 1456 x 1048)
Substack Social Preview Image Display Considerations
When creating your Substack social preview image, keep these technical considerations in mind:
- Social Media Display: The image appears when your post is shared on social platforms
- Feed Preview: Shows in RSS feeds and Substack's discover section
- Resolution: Higher resolution images (within file size limits) display more clearly
- File Types: Substack supports PNG, JPG, and GIF formats
- Loading Speed: Optimize file size for quick loading across all devices
Common Preview Image Mistakes
- Using incorrect dimensions (causing unwanted stretching or cropping on social media)
- Uploading low-resolution images (appearing pixelated when shared)
- File size too large (slow loading or failed uploads)
- Poor contrast with text elements (making content hard to read in feeds)
- Overly complex designs (not readable at smaller social media sizes)
How Smart Banner Hub Helps
Smart Banner Hub makes creating a perfect Substack social preview image simple and effortless:
- Perfectly sized Substack preview images (1456 x 1048 pixels)
- Three customizable text fields for your post:
- Post Title
- Post Description
- Call to Action
- Full control over font size, font type, and text color
- Adjustable text positioning
- Multiple background options with color choices
- Option to upload your own background image
- Two distinct design approaches:
- Regular Text: Clean, traditional typography with perfect readability
- AI-Powered DBSCAN: A unique, eye-catching visual style using advanced AI clustering algorithms - a world-first feature exclusive to Smart Banner Hub
- Real-time preview
- Free preview before purchase
Create Your Substack Preview Image Now
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