jetendard

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Jetendard

This project is heavily inspired by Yeomil Mono and reuses much of its implementation with minimal changes. Compared with Yeomil Mono, Jetendard uses JetBrainsMono Nerd Font Mono instead of Geist Mono and applies a 1.15 scale to Pretendard. Slightly enlarging Pretendard reduces unnecessary spacing around Korean glyphs, making Korean word spacing feel more visually stable while improving the clarity and precision of Hangul rendering.

Jetendard is a reproducible font build project that combines JetBrainsMono Nerd Font Mono with Pretendard Korean glyphs.

The generated family is named Jetendard. Latin glyphs, programming ligatures, and Nerd Font symbols come from the ligature-enabled JetBrainsMonoNerdFontMono files. Korean and CJK glyphs come from Pretendard and are fitted into exactly two Latin monospace advances.

Zed Editor (font size 13.5) 图片：screenshot

Zed Editor (Korean comments) 图片：screenshot

Ghostty Terminal (Text Output) 图片：screenshot

Ghostty Terminal (Codex) 图片：screenshot

Build

uv sync --all-groups
make download
make run
make test

make run builds the full 16-variant family.

Generated files are written to:

• fonts/ttf/Jetendard-*.ttf
• fonts/otf/Jetendard-*.otf
• fonts/webfont/Jetendard-*.woff2
• fonts/webfont/jetendard.css

Generated outputs and upstream downloads are intentionally ignored by git.

CLI

uv run jetendard --help

Important options:

• --latin-dir: directory containing JetBrainsMonoNerdFontMono-*.ttf
• --cjk-dir: directory containing Pretendard-*.ttf
• --all: build the full 16-variant matrix
• --variants: explicit output variants such as Regular, Italic, or BoldItalic
• --weights: weights to build; without --styles, this selects upright variants
• --styles: normal, italic, or both
• --korean-italic-mode: Korean/CJK policy for italic variants, currently upright
• --korean-scale: visual scale for Korean/CJK glyph fitting
• --scale: compatibility alias for --korean-scale

The default Korean scale is 1.15.

Examples:

uv run jetendard --all
uv run jetendard --weights Regular Bold --styles normal italic
uv run jetendard --variants Regular Light Bold

Variant Coverage

Jetendard builds every ligature-enabled JetBrainsMonoNerdFontMono Mono TTF variant present in the pinned Nerd Fonts archive:

Weight	Upright	Italic	Pretendard Korean/CJK source
Thin	Jetendard-Thin	Jetendard-ThinItalic	Pretendard-Thin
ExtraLight	Jetendard-ExtraLight	Jetendard-ExtraLightItalic	Pretendard-ExtraLight
Light	Jetendard-Light	Jetendard-LightItalic	Pretendard-Light
Regular	Jetendard-Regular	Jetendard-Italic	Pretendard-Regular
Medium	Jetendard-Medium	Jetendard-MediumItalic	Pretendard-Medium
SemiBold	Jetendard-SemiBold	Jetendard-SemiBoldItalic	Pretendard-SemiBold
Bold	Jetendard-Bold	Jetendard-BoldItalic	Pretendard-Bold
ExtraBold	Jetendard-ExtraBold	Jetendard-ExtraBoldItalic	Pretendard-ExtraBold

Pretendard does not provide true static italic Korean/CJK fonts in the pinned archive, so italic Jetendard variants use italic JetBrainsMono Latin glyphs and upright Pretendard Korean/CJK glyphs. The generated font metadata and CSS still identify those variants as italic.

Scope

Jetendard only uses JetBrainsMonoNerdFontMono. It does not use JetBrainsMonoNerdFont, JetBrainsMonoNerdFontPropo, or JetBrainsMonoNL no-ligature variants. Because the base font is already Nerd Font patched, this project does not run a second Nerd Fonts patching step.

Pretendard-Black is not built by default because the confirmed JetBrainsMonoNerdFontMono archive does not contain a matching Black source. The downloader also extracts PretendardVariable.ttf when available for future custom-weight work.

Visual Check Samples

Use the same renderer, point size, and line height when comparing Jetendard against yeomil-mono or another monospace baseline:

Jetendard 테스트 ABC abc 0123456789
가각간갇갈감갑값같꿇뷁힣
한글과 English가 섞인 source comment
if (상태 === "완료") return "성공";
ㄱㄴㄷㅏㅑㅓㅕㅗㅛㅜㅠㅡㅣ
（）［］｛｝，．：；！？

Release Packaging

The build writes installable files under fonts/ttf, fonts/otf, and fonts/webfont. Release archives can be prepared from those directories after a manual visual pass confirms the default Korean scale across upright and italic variants. The OTF files are OTF-compatible outputs using the same TrueType outlines as the generated TTFs.

License

Jetendard is distributed under the SIL Open Font License 1.1. Review the upstream JetBrains Mono, Nerd Fonts, Pretendard, and Yeomil Mono projects for their full copyright and reserved-name notices.