フォントサイズテスター
任意のテキストを任意のフォントサイズでプレビューし、弱視ユーザーの可読性を確認できます。
100% client-side · no upload
How to use
- Enter your sample text in the text area above.
- Drag the sliders to adjust font size and line height and see the live preview update.
- Check the WCAG compliance badges: body text should be at least 16px, and large text at least 18px (or 14px bold).
Related accessibility tools
- WCAG Contrast Checker — verify text color contrast ratios
- Color Blind Test — simulate color vision deficiencies
- Motion Reduce Preview — test reduced motion CSS
よくある質問
- Is this font size tester free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All processing runs entirely in your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. Works on iPhone Safari and Android Chrome without installing any app.
Last updated: By jarvisbox