Free online S3M to FLAC converter

Source format: S3M

S3M stands for Scream Tracker 3 module, a classic tracker music format from the DOS era. It stores musical patterns, instruments, and sample data rather than a finished audio waveform. S3M files were widely used by demoscene musicians, game developers, and tracker composers because they are compact and allow detailed note-by-note sequencing.

S3M is still useful for preserving retro game music and tracker compositions, but it is not a modern playback format. To listen to it on most devices, it is usually converted to a standard audio file.

Target format: FLAC

FLAC means Free Lossless Audio Codec. It is a compressed audio format that preserves the original audio data exactly, unlike MP3 or AAC. FLAC is popular for archiving, high-quality music libraries, and situations where you want smaller files without losing fidelity.

FLAC is widely supported by media players, music servers, and audio editors. It is a strong choice when you want to keep the best possible quality from a rendered S3M module.

How to perform the conversion

The key point is that S3M is a tracker module, so conversion to FLAC is not a simple file rewrap. The module must first be rendered to audio, then saved as FLAC. The best results usually come from a tracker player or audio tool that can accurately emulate the original module playback.

Option 1: Use VLC for a quick conversion

1. Open VLC Media Player.
2. Go to Media → Convert / Save.
3. Add your .s3m file.
4. Click Convert / Save.
5. Choose a profile that outputs audio, then edit the profile if needed to use FLAC.
6. Select the destination filename with a .flac extension and start the conversion.

Option 2: Use a tracker player or module renderer for better accuracy

For archival-quality results, use software that is designed for module playback, such as OpenMPT, XMPlay, or foobar2000 with a module decoder. Open the S3M file, play or render it, and export or record the output to FLAC if the program supports direct FLAC export. In OpenMPT, for example, you can use File → Export → Wave and then convert the resulting WAV to FLAC in an audio editor such as Audacity or ffmpeg.

Option 3: Use ffmpeg from the command line

If your build of ffmpeg can decode S3M, you can convert directly with a command like ffmpeg -i input.s3m output.flac. This is convenient for batch conversion and automation. If direct decoding is not available in your build, render the module in a tracker player first and then encode the rendered WAV to FLAC.

Option 4: Convert online on 101convert.com

You can convert the file on 101convert.com for free, without installing any software. Upload the .s3m file, choose FLAC as the output format, and download the converted audio file when it is ready.

Notes on quality, compatibility, or limitations

Quality depends on playback rendering: because S3M is a module format, the final sound is determined by the player’s interpretation of effects, mixing, interpolation, and sample handling. Different tools may produce slightly different results.

FLAC is lossless, but the source is not: converting S3M to FLAC does not improve the original module’s sample quality. It only preserves the rendered audio without adding further compression loss.

Check loop behavior and effects: some tracker effects, tempo changes, and instrument loops may sound different across players. For the most faithful conversion, use a well-tested module player or renderer.

File size will increase: FLAC is compressed, but it is still much larger than an S3M module because it stores full audio rather than pattern data and samples.

Metadata support varies: if you need track titles or comments, make sure the conversion tool preserves or lets you edit FLAC tags after export.