A preset holds the look — language, theme, size, background, watermark. It never holds your code.
1Your code
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2The picture
This is the file itself, scaled to fit. Nothing is re-drawn on export.Paste some code above and it appears here.
Watermark
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Picture
The Code to Image Converter needs JavaScript: the picture is drawn in this browser, so your code never has to travel anywhere. With JavaScript switched off there is nothing that could draw it.