Free online UMX to FLAC converter

Source format overview

UMX is a package format used by Unreal Engine games, especially older titles. In practice, a UMX file usually contains module music data rather than a standard audio recording. It was commonly used by game developers and modders to store background music and interactive soundtrack assets inside game content.

Because UMX is a game asset format, it is not meant for general playback in most music players. To listen to the music outside the game, the file usually needs to be extracted or rendered into a standard audio format first.

Target format overview

FLAC is a lossless audio format that compresses sound without discarding audio data. It is widely used by audiophiles, archivists, and anyone who wants high-quality audio with smaller file sizes than WAV. FLAC is supported by many media players, music libraries, and editing tools.

The main advantages of FLAC are lossless quality, good compression, and broad compatibility with modern software and hardware. It is a strong choice when you want to preserve the best possible audio quality from a source file.

How to perform the conversion

Converting UMX to FLAC is usually a two-step process: first extract or decode the music from the UMX container, then save or convert the resulting audio to FLAC. The best tool depends on what kind of UMX file you have and whether it contains module music that can be rendered directly.

Option 1: Use a module player or converter that supports UMX

1. Open the UMX file in a tool that can read Unreal Engine music packages or module formats.
2. If the software can play the track, use its export or render function to save the audio as WAV or another uncompressed format.
3. Convert that exported audio to FLAC using a dedicated audio converter such as ffmpeg or Audacity.

With ffmpeg, the final conversion can look like this: ffmpeg -i input.wav output.flac

Option 2: Extract the audio first, then convert

1. Use a UMX-capable extractor or game asset tool to unpack the music from the file.
2. Save the extracted audio as WAV if possible, since WAV preserves full quality before FLAC compression.
3. Run the WAV file through a FLAC encoder or converter.

If you already have a playable audio export, the conversion is straightforward in Audacity: open the file, then choose File → Export → Export as FLAC. In ffmpeg, you can also convert directly from many supported audio inputs with ffmpeg -i input.umx output.flac, but this only works if your build of ffmpeg can decode that specific UMX content.

Using 101convert.com

You can also convert the file on 101convert.com for free, without installing any software. This is convenient for quick conversions when the UMX file is supported by the site’s built-in converter.

Quality, compatibility, and limitations

UMX is not a standard audio format, so direct conversion to FLAC may not always be possible. Some UMX files are wrappers around tracker/module music, and others may depend on game-specific data or codecs. If the file cannot be decoded directly, you must first extract or render it to an intermediate audio format.

For best quality, avoid converting through compressed lossy formats such as MP3. Use WAV or another uncompressed export before creating FLAC. Since FLAC is lossless, it will preserve whatever quality is present in the decoded source, but it cannot restore detail that was never in the original UMX content.

Compatibility can also vary by player and converter. If one tool fails, try a dedicated game audio extractor or a module player that supports Unreal Engine music files, then finish the conversion with a standard audio encoder.