No, size 11 font is not too small for a resume. In fact, size 10.5 font is even okay as long as it’s still easy for the hiring manager to read.
Because some fonts are slightly smaller than others, always check that your font is readable no matter the size. For instance, these fonts are harder to read at smaller font sizes:
- Garamond
- Gill Sans
- Futura
- Bodoni
- Italic fonts