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This is not the first time trying to solve this problem, which is why I'm writing a self-answered question, after spending another hour to re-discover a solution.

How do I force Asymptote to output a PDF or EPS with a given exact page size, regardless of what graphical elements are drawn into it and without scaling the content?

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    Your contribution is appreciated, but would be more helpful if you could explain how you need more than the size(width, height) command, e.g., size(50mm, 10mm);
    – Charles Staats
    Jan 11, 2016 at 1:43
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    @CharlesStaats AIFCT, size() does not prevent the output page to be smaller than requested. Also, its documentation talks about scaling of the graphic, which I do not want to happen.
    – Feuermurmel
    Jan 11, 2016 at 2:56

1 Answer 1

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Use this:

// Requested page boundaries.
pair page_min = (0mm, 0mm);
pair page_max = (50mm, 10mm);

// Label sticking out of the requested frame.
label("Lorem ipsum", (0, 0), E);

// Line, shorter in one direction of the frame, longer in the other.
draw((0mm, 0mm) -- (20mm, 20mm), 1mm + black);

// Clip the elements in the current picture. Prevents the page from being enlarged and needs to be called after all drawing commands.
clip(box(page_min, page_max));

// Set the page size. Prevents the page from being shrunken.
fixedscaling(page_min, page_max);
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