Many employers today, especially some of the larger companies, are scanning resumes electronically, so you may need a scannable version of your resume.
Rules are somewhat different for scannable resumes.
There is no italics, script, underlining, bullets, graphics, shading, multiple columns, vertical lines. Basically, no formatting whatsoever. Use a high-quality printer and print on plain white paper Many companies that request scannable resumes offer tips on how to format a resume for their scanners. Be sure to check out each specific company's website to see if they have guidelines to follow.