What is the FNMM file format?
A file with the .fnmm extension is a project made in Funky Maker: Mobile, a rhythm-game and modding engine from KinGames. The app runs on Android under the package name com.kingamescreator.fnmm and lets people build custom musical levels in the style of Friday Night Funkin' without writing code. It succeeds the developer's earlier Friday Night Maker tool.
An .fnmm file holds the full state of one project: the selected audio clips, note timing and chart arrangement, graphics, and other settings. It does not embed a finished song. Instead it saves references and configuration data, and the app rebuilds the level from those pieces when the file is loaded. That keeps the file small and portable, which suits sharing levels between players.
Because the format is proprietary and tied to a specific app build, .fnmm files are version-specific. A project saved in one release may not load correctly in a different version of the app.
Security & safety
RISK: MEDIUMThe file itself is project data, not an executable, so opening it in Funky Maker is low risk. The medium rating reflects distribution: FNMM files circulate through community sites and third-party APK mirrors alongside modded APKs. Only install the app from Google Play or the developer's own page, and treat shared levels from unknown sources with care.
Format details
in a nutshellPrograms that open FNMM files
Android1 app
Funky Maker: Mobile!
Free Install the app, tap CREATE, then choose IMPORT and select the .fnmm file to load the project for editing or play.
Funky Maker: Mobile!
Free Where an iOS build is published, install it, open the app, and use the CREATE > IMPORT option to load the .fnmm project. Technical details
deep spec| Encoding | Binary/packaged project data; internal layout is undocumented and proprietary |
| Container | Single-file project package that bundles references to audio, timing/chart data, arrangement details, graphics, and settings |
| Compression | Undocumented; project packages of this kind are commonly archived/compressed internally |
| Encryption | None documented |
| Structure | An FNMM file stores the full state of a Funky Maker: Mobile project, including selected audio clips, note timing and chart arrangement, graphics, and project settings. It does not embed standalone audio tracks; instead it saves references and configuration data that let the app rebuild the level or mix on import. |
| Typical size | Small to moderate (kilobytes to a few megabytes), since heavy media is referenced rather than embedded |
| Platforms | Android, iOS |
| Notes | Files are version-specific and may fail to load correctly across different app versions. The format is used by KinGames' Friday Night Funkin'-style rhythm/charting engine, the successor to Friday Night Maker. |
| Integrity | None documented |
| Released | 2023 |
| Latest version | Tied to the Funky Maker: Mobile app release (1.11.x as of 2026) |
FNMM conversions
Community Q&A
asked by usersNo questions yet - be the first to ask about FNMM files.
Frequently asked questions
How do I open an FNMM file?
.fnmm file. There is no desktop editor for the format at this time.
