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This may be counter to your original design intent, but I know people who would like to put these gradients into powerpoint.

Would you be able to generate an arbitrarily sized PNG or JPEG download from them?

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Good idea and yes, it's certainly doable and it's on the todo list.

In the meantime, you can always just load the html and delete the div elements for text and controls (to take a screenshot). Obviously this makes the "arbitrarily sized" part harder but now I have a nice wallpaper for my phone.

If you press escape you can hide all the UI, I added this feature for screenshots.

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