Any key. Any tempo. Independently.
The remix-prep classic: pull a track to your set's tempo without moving its key, or shift the key without touching the groove — or both at once, rendered to a clean WAV.
Free · no account · runs in your browser — nothing is uploaded; your audio never leaves your device.
One track shifted is prep. Two tracks warped together is a remix.
SongRemixer's console does this live across decks and pads — section-aware warping, cue juggling, the whole instrument. Sign up and load your first pair: 3 full packs free.
Remix prep in three moves
Most remix and edit work starts with the same three shifts: bring the source to your project tempo (tempo only, key untouched), reconcile the key with whatever it will sit against (key only, groove untouched), and — for the slowed/nightcore internet-edit families — move both at once by taste. This tool is those three moves with a render button; the presets encode the two internet classics as honest starting points.
Render once, at the end. Every stretch pass costs a little clarity, so audition with the preview, settle your numbers, and export a single time.
How to change a song's key and tempo separately
- Load the trackDrop the song on the tool.
- Set key and tempoMove the Key and Tempo controls, or start from a preset such as Slowed or Nightcore.
- PreviewPress Preview 15s, and Back to original to compare.
- ExportPress Render full track to WAV.
Frequently asked questions
How is this different from just changing playback speed?
Playback speed changes pitch and tempo together — the chipmunk effect. This uses a real time-stretching engine (Signalsmith Stretch) that decouples them: 120 → 100 BPM with the key untouched, or +3 semitones at the original groove.
Can I make slowed + reverb or nightcore versions?
The tempo/pitch half, yes: slowed edits typically run 80–90% with pitch down 1–2 semitones; nightcore runs 120–130% pitched up. Reverb isn't in this tool — run the export through your DAW's reverb after.
What are the quality limits?
Within ±15% tempo and ±3 semitones the render is clean on most material. Push both to their extremes at once and you'll hear the stretch working — every engine does. The preview exists so your ears decide before you render.
What format comes out?
Uncompressed 16-bit WAV at the source sample rate, named with the shift so future-you knows what it is.