Convert to RSO

    Upload any audio file and convert it to RSO format instantly using FFmpeg.

    All processing happens locally in your browser. No files uploaded to servers.

    Or you can just drag and drop
    files and folders

    Ready to convert to RSO

    Upload a video/audio file on the left to start converting, or click above to change format

    About RSO

    RSO is an audio format used mainly for LEGO Mindstorms projects to store sounds and voice prompts. You’d use it when you want your robot to play simple beeps, effects, or short clips.

    • •Best for LEGO Mindstorms: ideal when your goal is to add sounds to a Mindstorms robot, not for everyday music listening.
    • •Simple, small files: good for basic effects and short clips that load quickly on the device.
    • •Limited compatibility: most phones, music apps, and browsers won’t play RSO directly, so you’ll often need to convert it.
    • •Convert as needed: you can convert sounds into RSO for your robot, or convert RSO to common formats like MP3 or WAV to play on other devices.
    • •No web playback: it won’t play in web pages, and support on regular devices is limited.

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