You are asking the wrong question. 3 pages is too much.
:thumbsup: This. Unless your personal situation is unusual, three pages is
way too long for a "resume" as opposed to what would generally be called a "curriculum vitae." (Those are expected in academic and research circles and list all your publications, major projects, significant presentations, etc. as well as your education, work experience and notable special skills.) And if you need a "CV" as opposed to a "resume" in your particular field, you would most likely know it by the time you were looking for a job...
As to your exact question, I'm not sure if you made a typo about the length of the current draft of your resume, but if not, the short answer is: "
Hell no!" Unless you tried to gussy it up really excessively with large fonts or have a ridiculous amount of whitespace to begin with, there's simply
absolutely no way fiddling with margins, tabs, line-spacing, and fonts is going to magically make 2-plus pages of text fit onto a
single page without it looking completely absurd.
If it's a regular resume and it goes over even one reasonably formatted page (unless you're much further along in your career than your question realistically implies) my first guess would be that you've included
far too much descriptive text under each heading/item listing. A resume isn't a substitute for an interview. If you get as far as an interview, that'll be the time and place to discuss the minutiae of your experience. Trying to jump the gun and put all that in front of them in a resume will generally be more of a hindrance than it would be helpful.
PS: If for some reason you still feel very strongly that you want to include a lot of information not usually given on standard "resumes," at the very least add the non-standard material at the end, under some sort of creatively titled "supplemental" heading. But make sure the basic info is on the first two, and preferably the
first page. And be forewarned that a very long resume will generally raise your typical HR employee's eyebrows - not in a good way - no matter how impressive the details turn out to be. (No offense intended of course<g>, but in my experience, they're usually not the brightest bulbs in the corporate/firm chandelier and don't typically react well to the "unexpected.") You want your resume to "stand out," but not "stick out", if you get my drift.
😉