Upload Your Image
PNG, JPG, or JPEG (max 10MB)
Substack Image Resizer - Perfect Dimensions Every Time
Create professional Substack images with our free online resizer tool. Get the exact dimensions needed for Substack profile pictures, cover photos, posts, stories, and ads. No watermarks, no registration required.
Why Choose Our Substack Image Resizer?
- 100% Free: No hidden costs or premium features
- Perfect Quality: High-resolution output with optimal compression
- Privacy Safe: All processing happens in your browser
- Instant Results: Upload, resize, and download in seconds
Substack Image Formats Supported
Profile Picture
400 × 400px
Newsletter Header
1200 × 600px
Post Featured Image
1200 × 675px
Publication Logo
512 × 512px
Email Banner
600 × 200px
Subscription Card
800 × 600px
Author Bio Image
600 × 400px
Podcast Cover
1400 × 1400px
Social Share
1200 × 630px
Archive Thumbnail
400 × 300px
Welcome Banner
1200 × 400px
Category Icon
128 × 128px
Professional Substack Marketing
Perfect for digital marketers, social media managers, content creators, and businesses looking to maintain consistent Substack branding with professionally sized images.
