What this audio pitch and speed changer does
How speed and pitch change together
The controls, one by one
Presets for common edits
Preview first, then export
Using it as an online audio pitch adjuster for practice
Features explained
Live preview with waveform
After you load a file, the tool draws its waveform and plays it with play/pause and a seek bar. Speed, pitch and volume changes are heard while the audio plays, so you can adjust by ear instead of guessing. The waveform is drawn from the first channel of the file.
Speed from 0.25x to 2x
The speed slider changes how fast the audio plays and how long the exported file is. Moving in 0.05 steps gives fine control for slowing a phrase or speeding up a recording. Remember that speed also changes pitch in this tool.
Pitch in semitones, up to one octave
The pitch slider works in whole semitones from -12 to +12. Each semitone is one note on a piano, so the setting is easy to relate to music. It applies only when Maintain Pitch is off, and it changes the tempo along with the pitch.
Volume from 0% to 200%
You can make a quiet recording louder or a loud one softer. Above 100% the loudest peaks can be clipped in the exported file, which sounds like distortion, so raise it gradually.
Quick presets
Normal, Nightcore and Slowed + Reverb feel set the speed, pitch and Maintain Pitch switch in one click. They are starting points, and you can adjust the sliders afterwards.
Background rendering with progress
Export runs in a Web Worker, so long files do not freeze the page. A percentage on the button shows how far the render has gone. Longer files take more time and memory.
WAV export
The processed audio is saved as a 16-bit PCM WAV file. WAV is uncompressed, so it opens in almost any player or editor, but it is larger than an MP3. Expect roughly 10 MB per minute for stereo audio at 44.1 kHz.
What can you use it for?
Slowing down a passage to learn it
Play a fast guitar solo, drum fill or vocal run at 0.5x to hear each note. The pitch drops with the speed, but the notes stay in the same order.
Finding a comfortable key for singing
Shift a karaoke or backing track down or up a few semitones and sing along to check whether it fits your range.
Listening to speech again at a slower pace
Language learners and people transcribing an interview can slow a recording to catch words they missed.
Reviewing long recordings faster
Speed up a lecture or voice memo to skim through it. Voices will sound higher at faster settings.
Nightcore and slowed edits
Use the presets as a starting point for a sped-up or slowed version of a song and export it as a WAV file.
Simple sound design
Lower the pitch of a voice or sound effect to make it deeper, or raise it to make it thinner, then export the clip for a video or game project.
Tool information
| Tool type | Audio speed and pitch changer (resampling) |
|---|---|
| Input formats | MP3, WAV, AAC, OGG, FLAC, M4A (must be decodable by your browser) |
| Output format | WAV, 16-bit PCM |
| Speed range | 0.25x to 2x, in steps of 0.05 |
| Pitch range | -12 to +12 semitones, in steps of 1 |
| Volume range | 0% to 200%, in steps of 5% |
| Speed and pitch independent | No, they change together |
| Presets | Normal, Nightcore, Slowed + Reverb feel |
| Live preview | Yes, with waveform, play/pause and seek bar |
| Multiple files | No, one file at a time |
| Processing location | Your browser, with a Web Worker for the export |
| Maximum file size | 50 MB |
| Account required | No |
Benefits
- Nothing to install, and no account or sign-up step.
- You hear speed, pitch and volume changes while the audio plays.
- Pitch is set in semitones, which is easy to understand for musicians.
- Export runs in the background with a progress percentage.
- The audio file stays on your device.
Limitations
- Speed and pitch are not independent. Speeding up raises the pitch, slowing down lowers it, and this tool has no time-stretching.
- The Maintain Pitch switch does not keep the pitch fixed when you change speed. It only decides whether the semitone slider is applied.
- When Maintain Pitch is off and you shift the pitch, the exported length follows the speed setting only. Lowering the pitch can cut off the end of the track, and raising it can leave silence at the end.
- The Slowed + Reverb feel preset does not add reverb.
- The maximum file size is 50 MB, and only one file can be processed at a time.
- Extreme speed or pitch settings can sound rough, because the audio is resampled with simple interpolation.
- The export is always WAV, so files are larger than the original MP3 or AAC. Long files need a fair amount of browser memory.
- Volume above 100% can clip loud parts of the exported audio.
Privacy and security
The audio file you choose is read and decoded inside your browser, played through your browser audio engine, and rendered by a background worker on your device. The tool does not upload the file to a server. The download link for the processed audio is created locally in your browser.
Tips
- Start with small changes. A step of 0.05 in speed or 1 semitone is already easy to hear.
- Play the track and move the sliders while listening, then export only once you are happy.
- Check the end of the audio after exporting, especially if you lowered the pitch with Maintain Pitch off.
- Keep volume at or below 100% unless the original is very quiet.
- If your player complains about the downloaded file name, rename the extension to .wav, because the content is WAV audio.
- For very long tracks, cut the section you need first, then change its speed and pitch.
Frequently asked questions
Is this online audio pitch changer free, and do I need an account?
Yes, you can use it without an account or email. The page does not ask you to sign in before you export a file.
Does changing the speed also change the pitch?
Yes. This tool changes audio by resampling, so faster playback sounds higher and slower playback sounds lower, like a tape or record at a different speed. It cannot change speed while keeping the exact original pitch.
Can I shift the key of a song without changing its tempo?
Not with this tool. The pitch slider and the speed slider act on the same playback rate, so a shift of +2 semitones also makes the track about 12% faster. It is fine for a quick check of a different key, but not for keeping the tempo fixed.
What does the Maintain Pitch switch do?
It is on by default. While it is on, only the Speed slider affects the sound and the semitone slider is ignored. Turn it off to apply the pitch setting on top of the speed setting.
Which audio formats can I use, and what do I get back?
You can load MP3, WAV, AAC, OGG, FLAC and M4A files, as long as your browser can decode them. The exported file is always a 16-bit PCM WAV.
Is my audio uploaded to a server?
No. The file is decoded, played and rendered in your browser, and the processed file is created on your device.
How big can the file be?
Up to 50 MB per file. Larger files are rejected with a message. Long files also need more time and memory to render and produce a bigger WAV file.
How much can I change the speed and pitch?
Speed goes from 0.25x to 2x, and pitch goes from -12 to +12 semitones, which is one octave down or up.
Why does the end of my exported file sound cut off or silent?
This can happen when Maintain Pitch is off and you shift the pitch. The exported length follows the speed setting only, so a lowered pitch can cut the end and a raised pitch can leave silence. Check the end of the file after exporting.
Where is the processed file saved?
Your browser saves it to its usual downloads location. The name starts with processed_ followed by the original file name.