Is it a good idea to submit paper which is shorter than conference's page limit I'm writing up a paper for an upcoming CS conference. The problem is my paper is 1 page shorter than the conference's page limit. This conference doesn't have any workshop to accept a short paper.

Someone told me that submitting the paper shorter than the page limit was a very bad idea as it guaranteed rejection. Is it true?
I have seen papers rejected because it was shorter than the maximum allowed pages. But this was not the only reason for rejection; rather it was supporting that the paper didn't have enough contribution/content. If you don't want to give the reviewers any excuses to reject, then you might want to fill up the pages, but I think that's silly.

The answer would depend on the field and the page limit. If the page limit is 4, you probably want to fill all 4 pages, because 4 pages is usually not enough. But if the page limit is 12 pages, I see no problem for accepting a high-quality 11-page paper.