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The default font size for most word processing applications is 12-point. If you've edited the content of your resume as much as possible and you still need to cut some space, consider lowering the font size to 10.5 or even 10. Avoid going any smaller than that, however, because it will make your resume hard to read.  Make all the text in your resume the same size, rather than having the names of employers or schools larger than the rest of the text. If the labels or headings for the sections of your resume are larger than the rest of your text, you can also experiment with making them smaller. Try making them the same size as everything else. A good resume uses white space to break up text and allow for easy scanning. However, too much white space can push your resume over one page. You can adjust the line spacing in the text formatting menu on your word processing app. Decrease line spacing by the smallest increment possible. Make sure your words don't overlap and can still be read. You may want to print out your resume and see how it looks. Most word processing apps default to 1 in (2.5 cm)margins all the way around. However, you can typically get away with decreasing those margins to give more room for the text. Test your document by printing it before you send it to the potential employer to make sure it prints okay. Particularly if you're emailing your resume, there's a good chance your resume will never be printed on paper. However, you still want to make sure it's printable if necessary. Your word processing app defaults to a single column. However, it's possible to create 2 or even 3 columns on a document. If you're finding it difficult to get your resume down to a page, you may be able to use a 2 column or 3 column layout to get more information on the page. If you want to use multiple columns, you're better off starting a new document rather than simply converting the document you have. You'll have an easier time arranging your information correctly.
Decrease your font size to no less than 10-point. Tighten up the line spacing. Cut your margins in half. Experiment with multiple columns.