Upscale a WebP for print or a marketplace

Where your WebP came from matters more than the format

Almost nobody shoots WebP. It is what a CDN, a CMS or a marketplace produced from something else, usually at a size chosen for a page layout rather than for you. So a WebP is typically twice removed from the original: resized to fit a column, then compressed to hit a byte budget.

That has a practical consequence. The question is not "how do I upscale a WebP" but "what happened to this image before it became a WebP", and the answer decides which mode to use.

• Exported losslessly from a design tool — behaves like a PNG. Ultra Upscale 8X, straight to the size you need.
• Produced by a CDN resize from a good original — clean but small. Ultra Upscale 8X at 4× or 8×.
• Scraped from a live page or a marketplace listing — compressed hard, often twice. Check for blocking at 100% and run Unblur & Restore first.

If the original still exists anywhere, use it instead. No reconstruction beats the file the camera or the design tool actually wrote.

Why the output is a PNG

WebP is optimised for transmission: small bytes, decoded once, displayed, discarded. That is the opposite of what you want from an upscale, which is the largest, most complete version of the image you will ever hold, and the file every later derivative gets made from.

So the pipeline ends at PNG, tagged 300 DPI. If the destination is a web page, convert to WebP as the very last step, from the full-resolution PNG — one generation of loss, applied once, at the size it will actually be served.

Pro tips

• Check the pixel dimensions, not the file size. A 40 KB WebP and a 400 KB WebP can be the same dimensions; only the pixel count tells you how much there is to work with.
• Marketplace minimums are measured on the long edge. An 8× pass takes a 1000 px source to 8000 px, comfortably past the 1600–3000 px most platforms ask for.
• Do the conversion once. Enlarge → PNG → single WebP export. Every extra hop through a lossy format costs detail that cannot be recovered later.