Ultimate Vocal Remover

Ultimate Vocal Remover (UVR5) is a free, open-source desktop app that wraps many of the best community and research separation models, such as MDX-Net, Demucs and VR architectures, in one interface. You can choose and chain models to extract vocals, instrumentals and other stems, and quality rivals paid services when you pick the right model. It runs locally on Windows, macOS and Linux, so there are no minutes or uploads, though a good GPU helps. The trade-off is a steeper learning curve than web tools.