If "portable" means you want to use it on a website without relying on the user having it installed:

Hiragino is available as a Web Font via TypeSquare (operated by the font's developer).

Hiragino Sans is a classic Japanese Gothic (sans-serif) typeface known for its clean, humane shapes and superior readability. The W9 designation refers to its ExtraBold / UltraBold weight—the heaviest in the family.

The term "Portable" in this context suggests using this heavy font across devices (macOS, iPad, Windows) without permanent system installation, or evaluating its performance on mobile/tablet screens.

Even with the correct Hiragino Sans W9 Portable file, you may encounter problems.

| Problem | Solution | | :--- | :--- | | Font not recognized by Windows | The file may be a Mac .dfont. Convert to .ttf using TransType or FontForge. | | Missing Kanji characters | You downloaded a “lite” version. Ensure your file has over 8,000 glyphs. | | Blurry rendering in Chrome | Disable Windows’ "Font Smoothing" or force -webkit-font-smoothing: antialiased. | | USB font disappears | Use a portable font manager that caches the font temporarily in system memory. | | Licensing warning in Adobe apps | The portable font has a corrupt name table. Re-acquire from Adobe Fonts. |

@font-face 
  font-family: 'Hiragino Sans W9';
  src: url('path/to/hiragino-sans-w9.woff2') format('woff2');
  font-weight: 900;
  font-style: normal;
  font-display: swap;
.hero-title 
font-family: 'Hiragino Sans W9', 'Helvetica Neue', sans-serif;
font-weight: 900;
letter-spacing: -0.02em; /* W9 benefits from slight tightening */

If you absolutely cannot obtain a legitimate portable copy of Hiragino Sans W9, consider these alternatives that offer similar weight and Japanese legibility.

| Font | W9 Equivalent | Portability | | :--- | :--- | :--- | | Noto Sans CJK JP Black | 90% similar | 100% open source, portable, free | | Source Han Sans Heavy | 85% similar (wider stance) | Open source, variable weight | | Meiryo UI Bold | 70% similar (less refined) | Only on Windows | | Yu Gothic UI Heavy | 80% similar (more mechanical) | Requires Office installation |

For portable free workflows, Noto Sans CJK JP Black is your best bet. It is not Hiragino, but it is universally downloadable and legally portable across all OSes.