BSP Converter
FileFlip converts BSP files into 14 other formats entirely inside your browser, using Assimp compiled to WebAssembly. The BSP file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. There is no file-size limit and no account to create.
How do I convert a BSP file?#
- Drop your BSP file onto the converter at the top of this page, or click it to pick one from your computer.
- Choose the format you want out of it. FileFlip downloads the engine that conversion needs, once, and your browser caches it.
- Conversion starts the moment you pick the format, and the result is yours to download. The work happens in this tab, so nothing is uploaded and nothing is queued.
Is it safe to convert BSP files online?#
Yes, because nothing is uploaded. FileFlip converts BSP files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What happens to a BSP file#
FileFlip converts BSP into 14 formats with Assimp, all of it inside the browser tab. Each conversion below names the engine it uses, what it downloads, and exactly what that conversion keeps or drops.
| Category | 3D Models |
|---|---|
| File extension | .bsp |
| FileFlip support | Read only, so it is a source rather than a target |
| Conversions available | 14 |
| Engines | Assimp |
| Downloaded to your browser | 11.2 MB on the first conversion, then cached |
What is a BSP file?#
A BSP file is a compiled Quake III Arena level: an entire map's world geometry, pre-partitioned into a binary space tree, along with its lightmaps, texture references and entity placements, not a model of a single object.
Use BSP to ship or run a compiled Quake III Arena level; the original engine or a source port loads it together with its PK3 to render the map.
Convert a BSP file mainly to inspect or reuse its geometry outside the original game, since the format isn't meant to be edited directly; going back to the level editor's source .map file is the normal way to make changes.
The BSP file format reference covers the specification, the programs that open one, and what each conversion keeps or drops.
BSP questions people ask#
What is a BSP file?
A BSP file is a compiled Quake III Arena level, holding the map's entire world geometry pre-sorted into a binary space partition tree along with its lightmaps and entity placements. It's a level, not a single model, so opening one gets you the whole map's geometry rather than a prop.
Can I get a single object or prop out of a BSP file?
Not directly. A BSP stores one specific map's geometry already merged and partitioned for that layout, so there's no clean way to pull out an individual piece without rebuilding the partition and visibility data from source. The original .map file the level was compiled from is the format actually meant for editing.
What opens BSP files today?
The open-source ioquake3 engine and games built on it, like OpenArena, load BSP files exactly as Quake III Arena did, and level editors such as GtkRadiant and NetRadiant compile and inspect them directly.