Editor

K3 Studio draws everything itself: a single GL draw call with SDF rounded rects, its own glyph atlas with kerning, and a rope text buffer. It only redraws when something changes, so it sits at about 0% CPU when idle.

Editing

• Undo/redo, clipboard, IME, selections with mouse and keyboard, smooth scrolling
• Multi-cursor: Ctrl+Alt+Up/Down, Alt+click, Ctrl+D (next match), Ctrl+Shift+L (all matches). Copy and paste go one line per caret.
• Line actions: move (Alt+Up/Down), copy (Shift+Alt+Up/Down), delete (Ctrl+Shift+K), comment (Ctrl+/), go to line (Ctrl+G)
• Fallback fonts (Segoe UI, Segoe UI Symbol, Emoji, Microsoft YaHei) for glyphs the code font doesn't have

Highlighting

Highlighting comes from tree-sitter and uses a semantic palette: keyword, call, native (amber), method, field, parameter, string, number and comment. Supported languages: Lua, JS/TS, JSON, CSS, SCSS, HTML, Svelte (script as TypeScript, style as SCSS), server.cfg, SQL and Markdown.

Explorer and tabs

The explorer shows file-type icons, and folders that mean something in FiveM get their own color and glyph: client, server, shared, web, [category] and others. You can create, rename, move and delete from the right-click menu. When two tabs have the same file name, the label adds as much of the path as it takes to tell them apart (client/main.lua, server/main.lua).

Command palette and quick open

Ctrl+P opens files (fuzzy). Typing a prefix switches mode:

Prefix	Mode
>	Commands (also Ctrl+Shift+P)
#	FiveM natives: inserts the call, tagged client / server / shared
@	Symbols in the file: functions, events, commands, callbacks, CSS rules
=	Lua utilities: joaat, hex/signed, colors

JSON → Lua conversion runs on the selection as a > command.

Search and replace

Workspace search can be scoped by side (Client / Server) and by resource.

Action	Keys
Find in file	Ctrl+F
Replace in file	Ctrl+R
Replace in workspace	Ctrl+Shift+R

Snippets

Built-in Lua snippets, workspace snippets in .fed/snippets.json and personal ones in %APPDATA%/K3 Studio/snippets.json all show up in completion.

Markdown

.md files open rendered, with headings, lists, tasks, quotes, code, tables, rules and inline HTML. Switch with Preview | Text, or double-click a block to edit it at its line. Ask the agent opens the composer with the file attached.

Images

PNG, JPEG, BMP, GIF, TGA, PSD and SVG open as pictures, with fit, 1:1, wheel zoom, and the size and format shown. They're never saved as text.

Terminal

Named terminals are ConPTY shells (pwsh, or Windows PowerShell if pwsh isn't installed) in the bottom panel. Ctrl+` toggles the panel, and double-clicking a tab renames it. Terminals keep running while the panel is closed.

Stats

Coding time is measured on your computer and never sent anywhere: today, the last 7 days, all time, a 14-day chart, and breakdowns per language and project. You also get lines of code per language and per resource, and today's time sits in the status bar.