ตัวแปลงหน่วย CSS

คำถามที่พบบ่อย

›Is 1rem always 16px?

By default, yes — but if you change the root font-size, all rem values scale. We let you set the root for accurate conversion.

›rem vs em?

rem is relative to root font-size; em is relative to the parent's font-size. rem is more predictable for layout.

›Why use rem over px?

rem respects user font-size preferences (for accessibility) and scales the whole layout consistently.

›Is the converter free?

Yes — fully free, no signup.