New pace, same key
Slow a difficult passage or speed up speech while keeping the original pitch.
Audio Speed and Pitch Changer Online
Slow down or speed up audio without changing its key, or raise and lower the pitch without affecting playback speed. Adjust both independently, preview the result and export online.
Speed 0.25×–4× · Pitch −12 to +12 semitones · Processed in your browser
Change speed and pitch independently
Choose a new playback pace without changing the musical key, move the complete clip into another key without changing its duration, or adjust both together.
Selected clippractice-track.wav
01:20Speed
0.5×0.75×1×1.25×1.5×
Slower playback, original musical key.
Pitch
−120+12
Lower key, independently of playback speed.
Original00:0001:00
1×
Adjusted00:0001:20
0.75×
New key, same length
Raise or lower the complete clip in semitones without changing its duration.
Shape both together
Build a slower backing track in a comfortable key or test a different creative feel.
How to change audio speed and pitch online
Start with the whole recording, or trim and split it first when only one section needs a different pace or key.
Choose your audio
Select an MP3, WAV, M4A or another supported audio file from your device. Your audio stays in your browser.
Select the part you want
Use the whole recording, or trim and split it first when only one passage needs a different pace or key.
Set speed, pitch or both
Set Speed from 0.25× to 4× and Pitch from −12 to +12 semitones. Leave either control unchanged when you only want to adjust the other.
Download your audio
Preview your chosen pace and key, then select an output format and export. Download a separate file; your original recording stays unchanged.
Change the track for the way you use it
Choose a familiar task and follow a practical path from the original recording to a useful practice, performance or content file.
Learn a difficult part before returning to full speed
Keep the song in its original key while giving yourself more time to hear every note and movement.
- 1
Split or select the passage you want to study
- 2
Start at 0.75× or 0.5× with Pitch at 0
- 3
Move closer to 1× as the phrase becomes comfortable
Move a backing track into a more comfortable vocal range
Test small pitch changes without forcing the singer to rehearse against an unsuitable key or tempo.
- 1
Leave Speed at 1× and move Pitch by one semitone
- 2
Preview the chorus or highest phrase
- 3
Choose the best key, then set a slower rehearsal pace if needed
Hear fast speech without the chipmunk effect
Reduce the playback speed while preserving natural vocal pitch so individual words are easier to follow.
- 1
Select the sentence or interview section
- 2
Reduce Speed while keeping Pitch at 0
- 3
Replay the passage, then export the slower study copy
Fit narration into an edit without changing the voice
Make a short voiceover slightly faster or slower, then preview it with the rest of your timeline before exporting.
- 1
Trim the narration to the part used in the edit
- 2
Make a small speed adjustment and keep Pitch at 0
- 3
Check timing and clarity before downloading the new file
Speed, tempo, BPM and pitch explained
These terms are related, but they do not describe the same part of a recording. Use the control that matches the result you actually need.
Extreme speed or pitch settings can sound less natural. Make a smaller change first and preview important passages before exporting.
| Control | What changes | What can stay the same |
|---|---|---|
| Speed | Playback rate and duration | Pitch / musical key |
| Pitch | How high or low the audio sounds | Speed and duration |
| BPM | Musical beats per minute | Musical key |
| Semitones | Musical pitch interval | Tempo |
What happens to a one-minute clip?
Below 1× makes the result longer. Above 1× makes it shorter. Pitch can remain unchanged at every example speed.
| Speed | Use | New length |
|---|---|---|
| 0.5× | Half speed | 2:00 |
| 0.75× | Slower practice | 1:20 |
| 1× | Original speed | 1:00 |
| 1.25× | A little faster | 0:48 |
| 1.5× | Faster review | 0:40 |
| 2× | Double speed | 0:30 |
Know the exact tempo you want? Use BPM Changer for an Original BPM → Target BPM workflow. Only need to transpose a song? Use the lightweight Pitch Changer. To detect a recording first, open Key & BPM Finder.
Preview the result, then choose the right file
Your settings are applied to a new export. The original recording on your device is not overwritten.
Preview before export
Listen to the selected clip, its joins and the rest of the timeline before rendering the finished file.
MP3, WAV or FLAC
Choose MP3 for convenient sharing, or WAV and FLAC when you want to avoid another lossy encoding step.
Processed on your device
Speed and pitch processing runs in your browser. No account or desktop software is required.
Audio Speed and Pitch Changer FAQs
Independent controls, timing, semitones, audio quality and private browser processing.
Can I change audio speed without changing pitch?
Yes. AudioMuse uses time-stretching to speed up or slow down audio without shifting its pitch. Leave Pitch at 0 semitones to keep the original key in both the preview and downloaded file.
Can I change pitch without changing audio speed?
Yes. Leave Speed at 1× and adjust Pitch from −12 to +12 semitones. Use Semitone or Whole Tone to choose the adjustment step. This transposes the whole clip without changing its playback duration; it does not correct individual sung notes.
How do I slow down a song to half speed?
Upload the song, set Speed to 0.5× and leave Pitch at 0. Preview the section before exporting. Half speed makes a one-minute clip about two minutes long, so the finished file still needs to stay within the 60-minute project limit.
Can I change only one part of a song?
Yes. Open the file in Audio Editor, split or trim the passage into its own clip, select that clip and apply the new speed or pitch. Preview the joins because changing one clip’s speed also changes its duration on the timeline.
What is the difference between speed, tempo, BPM and pitch?
Speed controls how quickly a recording plays and changes its duration. Tempo describes the musical pace, often measured as BPM. Pitch controls how high or low the recording sounds. AudioMuse lets speed and pitch remain independent. Use BPM Changer when you know the original BPM and want to enter a specific target BPM.
Will changing audio speed or pitch reduce quality?
Time-stretching and pitch-shifting can introduce artifacts, especially near 0.25×, 4× or large semitone changes. Start with a moderate setting and listen before downloading. MP3 export adds lossy encoding; WAV or FLAC avoids that extra lossy step but cannot restore detail missing from the source.
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Which formats and file limits are supported?
Import MP3, WAV, FLAC, OGG, Opus, M4A, M4B, AAC, AIFF, AIF, AIFC, WMA, AMR or MP4 with an audio track. Each input can be up to 300 MB, and the finished timeline must stay within 60 minutes. MP4 input is handled as audio; the export does not preserve video frames.
Is Audio Speed and Pitch Changer free and private?
Yes. Changing speed, previewing and downloading are free, with no sign-up required. Your audio is processed locally in your browser rather than sent to a server for processing.