Speed up or slow down any song with this free online audio speed changer. Upload a track, drag from 0.25× to 4×, choose whether the pitch follows the speed or stays locked, preview it live, and download a WAV — everything runs in your browser, with nothing uploaded and no signup.
Audio Speed Changer
Speed a song up or slow it down — from 0.25× to 4× — and choose whether the pitch follows the speed or stays locked. Preview live, then download a WAV. Runs entirely in your browser; nothing is uploaded.
Speed changes pitch works like a record played faster or slower, so slowing a track also deepens it and speeding it up raises the pitch — perfect for nightcore, daycore and vibe edits. Keep original pitch uses a phase-vocoder time-stretch so you can slow a song down to learn or transcribe it without it sounding lower, or speed it up without the chipmunk effect. Pitch-locked processing runs on your device and takes a few seconds on long songs.
How to change the speed of a song
- Upload your track — MP3, WAV, M4A, OGG or FLAC. It is processed on your device.
- Set the speed — drag the slider or tap a preset (0.5×, 1.25×, 2×…). Below 1× slows the song down; above 1× speeds it up.
- Pick a pitch mode — Speed changes pitch for the classic record-style effect, or Keep original pitch to change only the tempo and leave the pitch untouched.
- Preview and export — press play to hear it, then Download WAV to save.
What you can use it for
- Learning & transcription — slow a solo or vocal down to hear every note.
- Dance & practice — drop the tempo to rehearse choreography or an instrument, then bring it back up.
- Nightcore & sped-up edits — speed a song up for that bright, hyper TikTok sound.
- Podcasts & voice — speed up spoken word to skim, or slow it to catch a fast passage.
Change speed without changing pitch
You choose. In Speed changes pitch mode the tool moves speed and pitch together, exactly like a vinyl record played faster or slower — the sound most people want for nightcore, slowed and vibe edits. Switch to Keep original pitch and it uses a phase-vocoder time-stretch to change only the tempo: slow a song down to learn or transcribe it without it sounding lower and muddy, or speed it up without the chipmunk effect. For the slowed, washed-out aesthetic, try the Slowed + Reverb Generator; to move pitch on its own while keeping the tempo, use the Pitch Shifter.
Free and private
All processing happens locally with the Web Audio API, so your audio never leaves your browser. The export is a full-resolution WAV with no watermark. To hear speed and pitch changes clearly, a decent pair of studio headphones helps.
Frequently asked questions
How do I slow down a song online for free?
Upload it here, drag the speed below 1× (0.75× is a gentle slow-down, 0.5× is half speed), preview, and click Download WAV. No signup, nothing uploaded.
How do I slow down a song without changing the pitch?
Turn on Keep original pitch, then drag the speed below 1×. The song plays slower for practice or transcription while every note keeps its original pitch. It takes a few seconds to process a full-length track.
Can I speed a song up without it sounding like chipmunks?
Yes — switch on Keep original pitch mode and speed it up as much as you like; the tempo rises while the pitch stays put, so there’s no chipmunk effect. In the default Speed changes pitch mode, small increases (1.1×–1.25×) still sound natural.
Does it upload my audio?
No. Everything runs in your browser; your file never leaves your device.
What formats are supported?
Any format your browser can decode — MP3, WAV, M4A/AAC, OGG, FLAC. The export is a WAV.
Does it work on mobile?
Yes, in mobile browsers. Large files process faster on a laptop or desktop.
Is it really free?
Completely — no signup, no watermark, no limits.