Contact
Write to hello@stemsplitterlab.com. That mailbox is for bug reports, a download that will not finish, and questions about what the tool does. It is not a support line that can recover a song from your browser. Songs never reach us, so we cannot send them back.
If a download stops, say which browser you are using and whether it failed on the first attempt or after a change in Help & settings. If a stem sounds wrong, describe the mix in general terms. You do not need to attach the song. Please do not send a file you do not have the right to share.
What a useful note includes
The page you were on, the browser, and what you expected to happen. A sentence is enough. If the tab showed an error, quote that sentence. Screenshots of the player are fine. Screenshots that include a private library of filenames are worth cropping first, because those names stay on your machine unless you choose to send them.
The how it works page covers how a song is split. The credits page keeps the license notices. The privacy page covers what is stored locally. If the question is answered there, the email can be short.
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