: How to scale artwork and content from mm to pixels i'm making a template of a ticket of 80mm for a web app in Illustrator CC 2017, but now realize that when i go to export>save for web,

@Lengel450

I'm not sure what your question is..

80mm = 227px at 72 Pixel/Inch (the resolution at which Illustrator's Save for Web, saves) so I'm not sure where the problem is.

From Adobe Help Center:

"When you save artwork in a bitmap format, such as JPEG, GIF, or PNG, Illustrator rasterizes the artwork at 72 pixels per inch."


If you wish to save directly from AI at a different resolution, use
Export instead of Save for Web, It allows you to choose between 72ppi, 150ppi, 300ppi or Other (this will allow you to add
your own):






UPDATE:

You mentioned in the comments but "really 80mm are 302.362204728px" and that is right and wrong at the same time. I have mentioned in my answer that save for web saves at a resolution of 72 Pixel/Inch. That means 80mm will have a value of 227px when exported.



Your resulted value comes from a 96 Pixel/Inch resolution that translates to roughly 302px.



You can open your exported image in Photoshop, go to Image>Image Size and you will see the resolution of your AI exported image has a resolution of 72.



Check out this calculator:
www.pixelcalculator.com/?round=&FORM=1&DP=1&FA=&lang=en&mm1=80&mm2=&dpi1=72&sub1=+calculate+#a1

It will help you understand better.



Also, for more on the topic, check out this answer form @joojaa :
graphicdesign.stackexchange.com/a/100684/48529

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