Free online OKT to AAC converter

Source format: OKT

OKT is a classic module music format associated with the Oktalyzer tracker on the Amiga platform. It stores song data such as patterns, instruments, and playback instructions rather than recorded audio. OKT files are mainly used by retro-computing enthusiasts, chiptune and demoscene communities, and anyone preserving or replaying old tracker music.

Because OKT is a sequenced music format, it must be rendered by a compatible player or converter before it can become a standard audio file.

Target format: AAC

AAC (Advanced Audio Coding) is a widely used compressed audio format designed to deliver good sound quality at relatively small file sizes. It is supported by most modern phones, computers, media players, and streaming platforms. AAC is commonly used for music libraries, portable playback, and web or app distribution where efficient compression matters.

Compared with tracker modules, AAC is much easier to share and play on everyday devices because it contains rendered audio instead of pattern data and instrument instructions.

How to convert OKT to AAC

The most reliable approach is to render the OKT module to audio first, then encode that audio to AAC. Since OKT is not a direct audio format, the conversion depends on a player or converter that understands the module correctly.

1. Open the OKT file in a compatible tracker player or converter. Good desktop options include VLC, foobar2000 with module support, or dedicated Amiga module players/converters. If you want a simple browser-based option, you can convert the file on 101convert.com for free without installing software.
2. Export or render the module to an audio file. If the program supports direct export, choose File → Export or File → Save as and select a lossless intermediate format such as WAV or FLAC. This preserves the full rendered output before compression.
3. Encode the rendered audio to AAC. Use an audio editor or encoder such as FFmpeg, Audacity, or iTunes/Music depending on your workflow. With FFmpeg, a typical command is ffmpeg -i input.wav -c:a aac -b:a 192k output.aac.
4. Verify the result. Play the AAC file in a media player to confirm that the song starts correctly, sounds as expected, and has the desired duration.

If your player can export directly to AAC, the process may be shorter: open the OKT file, choose File → Export or File → Convert, select AAC as the output format, and save the file. However, direct OKT-to-AAC support is less common than export-to-WAV followed by AAC encoding.

Quality and compatibility notes

Conversion quality depends on the module player used to render the OKT file. Different players may interpret effects, timing, or mixing slightly differently, so the exported audio can vary. For best results, use a well-tested tracker player or converter that accurately supports Oktalyzer modules.

Because AAC is lossy, it will reduce file size by discarding some audio information. If you want to preserve the highest quality for archiving, keep a WAV or FLAC master in addition to the AAC copy. Also note that some older devices or software may prefer .m4a containers for AAC audio rather than raw .aac files, even though the audio codec is the same.