Upscale images for Merch by Amazon

Merch by Amazon wants 4500 × 5400 artwork. AI art and old designs are often 1024 or 2048 pixels. For print-on-demand designers, the Illustration model at 4× is the starting point. 4× runs on your device too, so nothing uploads, and needs the Pro plan.

Last updated 2026-10-05

Recommended settings

Model: Illustration
Scale: 4× (Pro, on your device)
Denoise: 0 of 100
Output format: PNG

The Illustration model keeps flat colour flat and line edges clean, where the Photo model would invent texture.

Tips

Use the Illustration model: it keeps flat colour flat and edges clean.
Keep the PNG transparency, the upscale preserves the alpha channel.
After 4×, resize to 4500 pixels wide with the resize tool and centre the art on the 4500 × 5400 canvas.

Worked example

The target for Merch by Amazon is 4,500 × 5,400 pixels. The art sits on a transparent canvas, so it only has to fill the width or the height, not both. This table shows the smallest scale that reaches it from three common source sizes, and what 4× gives each one. 4× is the largest scale, so a target slightly beyond it is finished with the resize tool, up to 5× in total.

Your image	Scale needed	Output at 4×	4× reaches target?
512 × 512	Too small, use a bigger source	2,048 × 2,048	No
1,024 × 1,024	4×, then resize 1.1× to 4,500 × 4,500	4,096 × 4,096	Almost: resize 1.1× to finish
2,048 × 2,048	4×	8,192 × 8,192	Yes, then resize

How to upscale images for Merch by Amazon

Open the upscaler and add your images, or a whole folder.
Choose the Illustration model and 4×.
Set denoise to about 0 so texture and grain stay.
Export PNG and download the batch.

Questions

What scale should I use for Merch by Amazon?

Work back from the target of 4,500 × 5,400: divide it by your image size and round up to 2× or 4×. If 4× is a little short, finish with the resize tool; past 5× in total, start from a bigger original. For most print-on-demand designers, 4× is the usual answer.

Which model is best for Merch by Amazon?

Illustration. The Illustration model keeps flat colour flat and line edges clean, where the Photo model would invent texture.

Is 4× free?

4× runs on your device too, so nothing uploads, and needs the Pro plan.

Do my images upload?

No. At 4× the model runs in your browser, so the files stay on your device.

What size do images for Merch by Amazon need to be?

4,500 × 5,400 pixels is the reference size used on this page. Upscale to at least that, then resize down to the exact size.

Scales compared

Scale	Runs	Plan	Note
2×	On your device	Free
4×	On your device	Pro	Recommended