Substack publication header size
The Substack publication header is 1500×500 px. Resize any photo to it on your device with TryQuickImg — not uploaded to our servers for processing, no watermark.
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Quick answer
Substack headers are often 1500×500 px (3:1). Resize with TryQuickImg in your browser.
Tips
- Wide 3:1 banner — keep text in the centre.
- Avoid edge-critical details.
- Convert an iPhone photo first with HEIC to JPG if it will not upload.
Other platform sizes
Shopify collection image · Amazon product main image · Google Business cover photo · App Store iPhone screenshot · Google Play feature graphic · Instagram profile picture · Instagram feed post (square) · Instagram story / reel · all sizes
Note: Platforms adjust their layouts over time. These are current common dimensions — ifSubstack shows a different recommended size in its uploader, use that.
Frequently asked questions
What is the Substack publication header size?
Substack headers are often 1500×500 px (3:1). Resize with TryQuickImg in your browser.
How do I resize my image for Substack without losing quality?
Resize to the exact pixels (1500×500) rather than cropping randomly, and start from the highest-resolution original you have. TryQuickImg draws the resized copy on a canvas in your browser, so there is no re-upload and no quality-stealing server round-trip.
Is my photo uploaded to TryQuickImg?
No. TryQuickImg runs in your browser. After the page loads you can go offline and still resize — nothing is posted to a server.