MO3 is a compressed tracker-module format that stores a MOD/XM/IT/S3M song’s samples as MP3 or Ogg Vorbis to shrink the file. Used widely in the demoscene. MO3 kept the tracker patterns intact but compressed the bulky samples, often roughly halving a module’s size. Analyser handles .MO3 alongside related formats such as .APE, .WV, .TAK and more. In Analyser's format library, .MO3 sits in the Audio category.

How do I open a .MO3 file?

Drop a .MO3 file onto Analyser at https://lab.valjdakosta.com/ and it is identified directly in your browser - no upload, no account and no software to install. Identify many more audio formats: lossless/hi-res codecs (Monkey’s Audio, WavPack, TAK, True Audio, DSD/SACD, Musepack), pro containers (Core Audio, RF64/BW64, Wave64, Sun AU, Broadcast Wave with timecode), speech/mobile (Speex, AMR-WB, QCP, 3GA, M4R, GSM), MPEG Layer I/II, instrument banks (SoundFont, SFZ, DLS, RIFF MIDI, GigaStudio), ringtones (RTTTL, iMelody, SAP), tracker modules (MOD, XM, IT, S3M, OctaMED, 669, Oktalyzer), chiptunes (NES NSF, SNES SPC, VGM, Game Boy GBS, AY, YM) and Audacity projects.

Can I open a .MO3 file online for free?

Yes. Analyser is a free online .MO3 identifier that runs entirely in your browser - your .MO3 file never leaves your device, so there is nothing to upload and no software to install. It even works offline once installed.

.MO3 file - what it is and how to identify it online

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Home › Formats › .MO3ID

What is a .MO3 file?

MO3 is a compressed tracker-module format that stores a MOD/XM/IT/S3M song’s samples as MP3 or Ogg Vorbis to shrink the file. Used widely in the demoscene.

Did you know: MO3 kept the tracker patterns intact but compressed the bulky samples, often roughly halving a module’s size.
Analyser handles .MO3 alongside related formats such as .APE, .WV, .TAK and more.
In Analyser's format library, .MO3 sits in the Audio category.
What Analyser reads: Identify many more audio formats: lossless/hi-res codecs (Monkey’s Audio, WavPack, TAK, True Audio, DSD/SACD, Musepack), pro containers (Core Audio, RF64/BW64, Wave64, Sun AU, Broadcast Wave with timecode), speech/mobile (Speex, AMR-WB, QCP, 3GA, M4R, GSM), MPEG Layer I/II, instrument banks (SoundFont, SFZ, DLS, RIFF MIDI, GigaStudio), ringtones (RTTTL, iMelody, SAP), tracker modules (MOD, XM, IT, S3M, OctaMED, 669, Oktalyzer), chiptunes (NES NSF, SNES SPC, VGM, Game Boy GBS, AY, YM) and Audacity projects.
Depth of analysis: .MO3 is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
Open a .MO3 file: Drag a .MO3 file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.
Related formats: .APE · .WV · .TAK · .TTA · .OFR · .DSF · .DFF · .MPC · .CAF · .RF64 · .BW64 · .W64 · .AU · .SND · .VOC · .BWF · .SPX · .AWB and more. See all supported file types.