Free online GYM to MP3 converter

A GYM file stores a Sega Mega Drive/Genesis sound-chip log, not a standard audio track, so many music players and editors cannot open it directly. Convert it to MP3 when you need a shareable file that plays on ordinary phones, computers, and audio software.

What the GYM format is

GYM is a chiptune log format that records sound-chip register writes, chiefly for the Mega Drive/Genesis YM2612 and SN76489 chips. Emulator recordings and game-music archives are common sources; playback software recreates the sound from the log rather than reading a recorded waveform.

What the MP3 format is

MP3 is a widely supported, lossy audio format. It is useful for portable playback, sharing, and importing into audio editors, with smaller files than uncompressed audio; encoding discards some audio information.

How to convert GYM to MP3

Online on 101convert.com

1. Upload the GYM file on the 101convert.com converter page. You can add several files for batch conversion; the per-file size limit is shown on the page.
2. Set the bitrate, sample rate, and channel count if needed, then start the conversion. The page’s converter uses FFmpeg.
3. Download the resulting MP3 file or files.

Offline with desktop software

On Windows, foobar2000 with the Game Music Emu decoder component can read GYM files and convert them to MP3.

1. Install foobar2000 and the foo_input_gme (Game Music Emu Decoder) component through File → Preferences → Components → Install.
2. Open the GYM file in foobar2000, right-click it, and choose Convert → .... Select MP3 output and configure the bitrate. If MP3 encoding is unavailable, install or select the LAME encoder when prompted.
3. Choose the destination and start the conversion.

Quality and compatibility

GYM playback is synthesized from chip commands, so the rendered sound can depend on the decoder’s emulation. MP3 encoding then adds lossy compression; use a higher bitrate when preserving chiptune details matters. The MP3 cannot retain the original register log for later chip-level playback or editing.