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FWIW, you can do this with a few lines of JS in the browser using canvas.drawImage() from an img element followed by canvas.toBlob().

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Firefox now adds random noise to all canvas readback operations (getImageData, toDataURL, and toBlob).

Ah, I didn't realize that always happened. I thought it was only if you did something that might have OS specific rendering characteristics (text-draws, etc).

Maybe having an ImageEncoder API might be worthwhile after all then https://github.com/w3c/webcodecs/issues/204.

That would require a browser that supports WebP

...which is, like, all of them released over the past 5 years: https://caniuse.com/webp

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