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KatakataLab
science A practical Japanese font lab for developers

The font changes
how your interface feels.

Compare Japanese web fonts such as M PLUS Rounded 1c and Zen Maru Gothic with your own text, then copy CSS and review practical delivery trade-offs.

tune 1. Live font tester & CSS generator

border_color Every text field in the preview is editable.
Loading font…

Type a Japanese or English heading here

Replace this paragraph with the copy you plan to publish. Japanese glyph shape, weight, spacing, and line height can change both readability and the emotional tone of an interface. Compare at mobile width before choosing a production font.

settings_sliders Typography controls

Generated HTML & CSS 
css
html

Created by Katakata · Last reviewed

How to use Japanese Web Font Lab

Japanese fonts contain far more glyphs than Latin-only fonts, so visual choice and delivery cost must be considered together. This lab lets you compare real Japanese sample text while generating CSS for a chosen family, size, weight, tracking, and line height.

Practical workflow

  1. Edit the heading, paragraph, and button in the live preview so the sample resembles your actual interface.
  2. Switch fonts and test both desktop and mobile widths. Adjust weight before spacing because a heavier face can change perceived density.
  3. Copy the generated CSS, then verify the exact font request and layout shift in browser developer tools on a cold load.

Accuracy and limitations

The preview uses available web-font files and browser rendering. A font may render differently by operating system, fallback stack, antialiasing, or unsupported weight. Only preload a font file that is used above the fold; unnecessary preloads compete with HTML, CSS, and images.

Privacy and data handling

Preview text stays in the page and is not submitted to KatakataLab. External font providers can receive normal network request metadata when their font files are loaded.

Why this page exists

KatakataLab publishes small browser tools built from recurring design and development tasks. This English page is maintained as a complete entry point, not as an automatic translation or a doorway page. If a control, explanation, or result is unclear, use the contact page and include the tool name, browser, and expected result without sending confidential input.

For another workflow, browse the English tool index or switch to the Japanese version.