Font Size Tester
Preview the same paragraph at multiple font sizes side‑by‑side to pick the most readable one.
- Runs in your browser
- No upload on server
- Free, forever
- Add content
- Test
- Copy / apply
How this works
- 1Type your text
Paste any headline or paragraph you want to test.
- 2Slide the size
Drag the size slider to see how the same text reads big, small and everything between.
- 3Copy the size
Once it feels right, copy the px/rem value straight into your CSS.
The quick brown fox jumps over the lazy dog. 1234567890
The quick brown fox jumps over the lazy dog. 1234567890
The quick brown fox jumps over the lazy dog. 1234567890
The quick brown fox jumps over the lazy dog. 1234567890
The quick brown fox jumps over the lazy dog. 1234567890
The quick brown fox jumps over the lazy dog. 1234567890
The quick brown fox jumps over the lazy dog. 1234567890
How this works — and why it's private
Type your copy and a list of sizes — we render each side‑by‑side using the same font. Great for picking accessible body sizes (16–20px is a safe range for most audiences).
Rate Font Size Tester
One tap. Anonymous. Helps others find the good tools.
No account, no email, no tracking — just a 1–5 number.