The "one page only" rule is outdated advice repeated without context. Length should match how much relevant experience you actually have — not an arbitrary universal rule.
0–5 years of experience: one page
If you're early career, one page is almost always right. You don't yet have enough distinct, relevant experience to justify more, and a padded one-job, two-page resume reads as filler.
5–15 years: one to two pages
This is where most professionals land. Two pages is completely normal once you have multiple roles worth describing in detail — just make sure every line earns its place.
15+ years or senior/executive roles: two pages, sometimes more
Senior and executive resumes often run two to three pages because the scope of responsibility and the number of relevant accomplishments genuinely require more space. Cut older, less relevant roles to a single line rather than padding recent ones.
What actually matters more than page count
ATS software doesn't penalize length directly. The real risk of an overly long resume is a human recruiter losing interest, or key information getting buried. Prioritize relevance over a strict page target.