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Life & fun · July 18, 2026

Q3Edit – Edit and play Quake 3 maps in the browser

I've been building a level editor for Quake 3 that runs entirely in the browser: Radiant-style layout, brush and patch editing, CSG, terrain sculpting, and entity editing. It opens and saves .map file and you can play the maps you build directly in the browser using a webassembly build of ioquake3.

Q3Edit – Edit and play Quake 3 maps in the browser launched on July 18, 2026 with 106 votes, #383 of 24,623 launches that month and more than 95% of that year's launches.

Visit q3edit.com ↗Alternativestop 2% of July 2026

In plain words

Q3Edit is a browser-based level editor for Quake 3 maps featuring a Radiant-style interface with brush and patch editing, CSG operations, terrain sculpting, and entity editing. Users can open and save .map files, then test their creations by playing maps directly in the browser using a WebAssembly build of ioquake3. The tool is designed for game designers and Quake 3 enthusiasts who want to create and playtest maps without installing external software.

written from the facts on this page · September 2026

From the sources

Q3Edit is an open-source, browser-based level editor for Quake III Arena with live MCP authoring for Codex and Claude, plus q3map and ioquake3 running as WebAssembly.

Open, edit, and save real .map files — brushes, patches, entities, and terrain in a TypeScript + WebGL2 editor, with BSP compilation by id Software's original q3map compiled to WebAssembly. One click launches your compiled map in browser-native ioquake3. Connect an AI coding agent to the map open in Q3Edit. The agent can inspect, create, texture, validate, compile, and playtest geometry while every atomic edit appears live in the browser and remains available through normal undo. Your maps, compiler, assets, and activity logs stay on your computer. Enter the pairing code in View → Local MCP Connection, or use the printed editor URL. Use Codex, Claude Code, or any compatible MCP client to…from q3edit.com

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