Working with a recording
The site offers vocal-and-instrumental separation as well as a multi-part split. Its FAQ lists MP3, WAV, FLAC and Ogg/Vorbis uploads, with limits of 100 MB and ten minutes per song.
For practice, start with a song you know and listen to the isolated part before using it in a larger edit. That gives you a concrete way to judge whether the separation is useful for your recording.
Save the output
The FAQ says processed files remain available for download for one month.
A sensible first pass
Use a track you know well, upload a short representative section, and listen to each returned part on its own. Pay attention to bleed from the other instruments and to whether the vocal remains usable at the points that matter to your edit. A quick listening check is more useful than assuming every source recording will separate in the same way.
The service is a better fit for practice, remix preparation, or isolating a part for closer listening than for promising a finished studio stem without review. Keep the original recording beside the downloads so you can compare timing and musical context.
What to confirm before relying on it
Check the current upload limits and download window before sending a large batch. The published FAQ gives a ten-minute and 100 MB ceiling and says processed files remain available for one month; those details should be confirmed again if your project depends on long-term access.
Do not treat a separated stem as proof that you have permission to reuse the underlying song. Rights for the recording, composition, and any public release remain separate questions.
Sources
Sources checked: