Vocal Remover
vocalremover.org
Splits a song into a vocal track and a backing track
No sign-up
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audiomass.co
A waveform audio editor that runs in the tab with nothing uploaded.
Open-source, dependency-free and account-free: load a WAV or MP3, see the waveform, then cut, fade, normalise, and apply compression, EQ or reverb before exporting. It all runs through the Web Audio API in your browser, so the recording never leaves the machine. It is a single-track editor — perfect for topping and tailing a voice memo, useless for a multitrack mix.
AltFTool does this too
If you would rather not leave the site, Audio Pitch & Tempo Shifter covers the same job here — free, no account, and it runs in your browser.
Open Audio Pitch & Tempo ShifterQuestions
Works the moment the page loads. No account, no email, no trial. Single track only — no multitrack mixing, no MIDI and no plugins.
No. AudioMass does the work inside your browser, so the file never leaves your device — you can load the page, disconnect from the network, and it still works. That makes it a reasonable choice for material containing personal data.
Single track only — no multitrack mixing, no MIDI and no plugins.
Alternatives
Same category or same task, ordered by how closely they overlap.
vocalremover.org
Splits a song into a vocal track and a backing track
vocaroo.com
Press record, get a link to the audio, send it to someone
podcast.adobe.com
Makes a voice recorded in a bad room sound like a studio microphone
clipchamp.com
A real multi-track video timeline in the browser, exporting 1080p free
online-video-cutter.com
Trims, crops and rotates a video with no account and no watermark
otranscribe.com
Play the audio and type the transcript in the same window