How to change the pitch or speed of a song
- Drop a song or recording into the box. A player appears so you can listen right away.
- Drag the Speed slider or tap a preset from 0.5× to 2×. The player previews the new speed live.
- Keep Preserve pitch checked to change the tempo only, or uncheck it for the classic tape-speed effect.
- Move Pitch shift to transpose up or down in semitones; the pitch change is heard after rendering.
- Choose MP3 or WAV and click Render & export to download the result.
What you can do with Speed & Pitch Changer
- Transpose ±12 semitones
- Shift the key up or down by up to an octave in whole-semitone steps, with or without changing the tempo.
- Speed from 0.5× to 2×
- Slow a fast solo to half speed for learning, or speed up lectures and podcasts, with presets for common rates.
- Pitch-preserving time stretch
- Uses the WSOLA algorithm to change tempo while keeping the original key, processed entirely in your browser.
- Nightcore and slowed effects
- Uncheck Preserve pitch to raise speed and pitch together for nightcore, or lower both for a slowed sound.
- Live speed preview
- Hear speed changes instantly in the built-in player before spending time on a full render.
- Clearly named exports
- Files are named with the settings used, such as song-0.75x-2st.mp3, so different versions are easy to tell apart.
Semitones, transposing and time-stretch quality
A semitone is one step on a piano keyboard, and 12 semitones make an octave, which doubles the frequency. Shifting by +2 semitones moves a song in G up to A, while -3 moves C down to A. Singers often shift 1 to 3 semitones to fit a song to their range, and guitarists transpose down a half step (-1) to play along with bands that tune to E flat. To change the key without touching the tempo, leave the speed at 1.00× and only move the pitch slider.
For learning a fast passage, 0.75× is a common starting point, then work up through 0.9× to full speed. Time stretching cuts the audio into short overlapping slices of about 46 ms and re-spaces them, so it sounds clean on speech and most music but can turn slightly phasey or echoey at extremes, such as 0.5× combined with a large pitch shift. Drums and sharp attacks show artifacts first. For the most natural result keep changes moderate, and export WAV if you plan further editing.
Frequently asked questions
Can I change the pitch without changing the speed?
Yes. Leave the speed at 1.00× and move the Pitch shift slider. The tool resamples the audio to the new pitch and then time-stretches it back to the original length, so the song keeps the same duration in the new key.
How do I slow down a song without changing the pitch?
Set Speed below 1, for example 0.75×, and keep Preserve pitch checked. The built-in player previews the slower tempo immediately; click Render & export to save a slowed-down copy as MP3 or WAV.
How do I make a nightcore version of a song?
Uncheck Preserve pitch and set the speed to around 1.2× to 1.3×. Speed and pitch then rise together like a sped-up record. For a slowed version, use 0.8× to 0.85× with the same box unchecked, then render and export.
Is my song uploaded to a server?
No. Decoding, pitch shifting, time stretching and MP3 encoding all happen in your browser. Long songs take a few seconds to render because the work is done on your own device, but the file never leaves it.
Why can't I hear the pitch change in the player?
The player previews speed in real time using your browser's playback rate, but semitone shifts need a full render. Click Render & export; the result appears in a player below so you can listen before keeping it.