The classic 0.85x edit with a long hall tail, ready in one click. One file in, several versions out - free, in your browser, no signup and no upload.
Open an audio file you have the right to use. Everything below runs locally on your device.
Quick presets — one click sets speed, key and effects; every button opens the same studio
Free exports stay free: single WAV files, loop-only exports, practice sheets and share links never need an account. Google sign-in is asked for only when you download the paid Pro batch versions, so the licence can be tied to your email address. Your audio still never leaves the device.
All processing runs offline in your browser with the Web Audio API. Export is 16-bit WAV.
This is an alternate name for one of the saved presets. It opens the same engine with the same saved settings, described for the way people actually say it. Every page on this site loads one shared workbench: you open a single audio file you have the rights to use, set speed, key, loop points and effects once, then render as many versions as you need from that same file.
Speed 0.85x, -3 semitones, a generated hall reverb at about 40 percent wet and a warm bass shelf. You can change any of those values before exporting; the preset is a starting point, not a limit.
In practice, the Slowed + reverb preset loads 0.85x, -3 semitones, a generated hall tail and a warm bass shelf, so the whole edit is one click and one export. The result is rendered with OfflineAudioContext and encoded to WAV inside your browser. Nothing is uploaded and the free tools need no account; Google sign-in is asked only for paid Pro batch downloads.
A 16-bit WAV of the full track or only the A-B region, optionally peak-normalized to -1 dBFS. Batch export writes several versions plus a plain-text manifest, and the share link carries speed, key, loop points and notes - never the audio.
Drop a recording, a licensed track or a student demo. It never leaves the browser tab.
Slow to 70%, transpose to a singable key, loop bars 12-20, mute the lead vocal with center cancellation.
Export a WAV for practice, or share a practice sheet link with the exact settings - no audio, no copyright transfer.
Each scenario opens the same workbench with the settings already set for that task.
Transpose a song into the student's range and loop the phrase they keep missing.
Slow a solo to half speed without changing pitch, then ramp it back up.
Build a rehearsal backing track and share the key and tempo with the band.
Make a quick instrumental and export a clean WAV for the venue system.
Slow lyrics for listening exercises and hand out a timed practice sheet.
Drop the lead vocal, keep the real arrangement, rehearse over it.
The free studio stays free forever. Pro is a one-time licence for batch work - never the ability to open the tool.
Everything in the studio, no account, no watermark, unlimited single-file exports.
One payment for lifetime batch export - render every preset of a song in a single pass, with a manifest and a practice sheet.
Embed the studio in an LMS, or license it for a department.
No for everything free. Audio is decoded and processed inside your browser using the Web Audio API, with no upload and no watermark. Google sign-in is asked for only when you download paid Pro batch versions, so the licence can be tied to your email.
Only open audio you have the right to use: your own recordings, licensed material or student work. We do not provide songs, lyrics, or downloads from streaming or video platforms.
A practice sheet - speed, key shift, loop points, tempo and your note - encoded in the link. No audio travels with it, so the student opens their own legally held copy of the song and gets your exact settings.
No. The speed control keeps the original pitch. Transposition is applied when you export, so the practice sheet and the WAV agree.
Current Chrome, Edge, Firefox and Safari. Any format your browser decodes (MP3, WAV, M4A/AAC, OGG, FLAC). Exports are 16-bit WAV.