English | Japanese/日本語

JP Font Fixer

A small Windows utility that installs and overrides Japanese system fonts using Noto Sans JP.

Why though?

MS Gothic and MS PGothic look... ugly. It's because they were designed for Windows 3.1, not Windows 11.

Just look at this example:

Noto Sans JP however looks nicer and is more readable.

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What it does:

• Installs Noto Sans JP fonts into Windows
• Applies registry overrides for these Japanese system fonts:
  • MS Gothic
  • MS UI Gothic
  • MS PGothic
• Provides a simple GUI to:
  • Install fonts
  • Revert changes back to the default MS fonts

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Requirements

• Windows 10 / 11
• Administrator privileges (required for font + registry changes)

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How to run

Option 1 (Development)

dotnet run

Option 2 (Published build)

Run FontFixerGUI.exe as Administrator

How it works

The app:

1. Copies Noto Sans JP font files into C:\Windows\Fonts
2. Adds registry entries under: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts
3. Applies font substitutions via: FontSubstitutes

Revert option

The app can restore the default font mappings by removing registry overrides.

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Notes

• Requires admin rights
• Changes system-wide font behaviour
• Restart may be required after installation

License

Copyright (C) 2026 David Maj/dmx3377 david@dmx3377.uk

This is free and open-source work, and is licensed under the Apache 2.0 License. See the LICENSE file for further information.

For the Noto Sans font, please see the LICENSE-Font file.