No, size 11 font is not too small for a resume. In fact, even a size 10 font can be okay. What matters is that it’s easy for the hiring manager to read your resume.
However, keep in mind that 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