What is Font Size Tester?
Font Size Tester lets you type any text and see it rendered at multiple font sizes simultaneously. Compare readability across sizes from 8px to 96px, switch units between px/rem/pt, and check accessibility contrast — perfect for design decisions.
How to use
- Step 1 — Type or paste the text you want to test.
- Step 2 — Adjust the size range and unit (px, rem, or pt) to preview.
- Step 3 — Compare all sizes side by side to pick the best option for your design.
Result
Testing a navigation label: type 'Dashboard' and compare it at 12px, 14px, and 16px to decide which size offers the best readability without wasting space.