Keep the original pitch while you slow a song right down to learn it. 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
All processing runs offline in your browser with the Web Audio API. Export is 16-bit WAV.
This is one of the three core entry points into the studio. 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.
No preset is applied: speed 1.00x, 0 semitones, reverb off, center cancellation off and output gain at 0 dB. You can change any of those values before exporting; the preset is a starting point, not a limit.
In practice, the Speed slider changes the playback rate while the browser's preservesPitch flag holds the original key steady. The result is rendered with OfflineAudioContext and encoded to WAV inside your browser. Nothing is uploaded and there is no account.
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 tool stays free forever. Paid tiers sell batch work, storage and institutional licensing - never the ability to open the tool.
Everything in the studio, no account, no watermark, unlimited single-file exports.
For teachers preparing a whole class's material in one sitting.
Embed the studio in an LMS, or license it for a department.
No. Audio is decoded and processed inside your browser using the Web Audio API. There is no account, no upload and no watermark.
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.