Hover-to-zoom on Substack
Original-resolution images in Substack newsletters, on hover. Ultra Zoom enlarges Substack images the instant you hover — no clicks, no tabs, no tracking. Substack hover zoom is part of the free tier.
What you get on Substack
- Decodes the original image URL that Substack’s CDN wraps inside its resize URL
- Works across newsletter posts, archives, and author profiles
- Handles the small avatar and header crops as well as inline images
Why it helps on Substack
Substack’s image CDN embeds the real source URL inside its own resize URL, so the file you see is a re-encoded crop of the writer’s original. Ultra Zoom decodes the wrapped URL and loads that original instead — the difference is obvious on charts, maps, and any newsletter that leans on visual evidence.