Free online NSF to OGG converter

NSF files contain NES/Famicom game music and need a compatible player or emulator, so converting them lets you listen in applications that support OGG audio. OGG is also useful when you want a compressed audio track to share or edit.

What the NSF format is

NSF, or Nintendo Sound Format, stores music data and playback instructions for the NES/Famicom sound hardware; it is not a recording of the music. You commonly encounter NSF files in collections of music extracted from games. A file can contain several songs, often called tracks or subsongs, which a compatible player renders as audio.

What the OGG format is

Ogg is a container format, most commonly used with the lossy Vorbis audio codec. OGG files are supported by many media players and audio-editing programs, and Vorbis compression produces smaller files than uncompressed audio.

How to convert NSF to OGG

Online on 101convert.com

1. Upload the NSF file on the converter page. You can add several files for batch conversion; the per-file size limit is shown on the page.
2. Choose the bitrate, sample rate, and number of channels before converting.
3. Start the conversion, then download the OGG file or files.

The page’s converter uses FFmpeg.

Offline with desktop software

FFmpeg is free and runs on Windows, macOS, and Linux. Use a build that includes the libgme NSF decoder and the libvorbis encoder. For example, to convert the first track:

ffmpeg -track_index 0 -i input.nsf -c:a libvorbis -q:a 5 output.ogg

Replace input.nsf and output.ogg with your filenames. The track index starts at 0; run the command again with another index to render a different song in a multi-track NSF. If FFmpeg reports an unknown decoder or encoder, use a build with the required support.

Quality and limitations

Because NSF stores synthesis data rather than recorded samples, conversion renders the music using an emulator; OGG bitrate does not improve the source sound. Vorbis is lossy, so higher quality settings retain more detail at the cost of larger files. Some NSF songs loop or lack a defined ending, so check the rendered duration and track ending.