Speed1.00×
0.5×
2×
The real renderer uses pitch compensation. Extreme speed changes may produce artifacts.
Browser-local audio tool
Audio Speed Changer
Slow down or speed up audio from 0.5× to 2× while pitch compensation targets the original pitch.
- Processed locally in your browser
- No source upload
- Refresh clears this task
Audio Effects
Speed Changer
Speed1.00×
0.5×
2×
0.5×–2× · pitch compensation
Output
WAV · changed duration
Illustrative workflow preview
Choose a pace. Hear the result.
Result preview
Play resultExample waveform—not user audio. The workspace creates the real WAV.
Pick the pace for the job
Slower results become longer; faster results become shorter. Pitch compensation targets the source pitch rather than intentionally creating a pitch effect.
0.75×
Slow practice
Longer duration
1.00×
Original pace
Unchanged duration
1.25×
Quick review
Shorter duration
1.50×
Fast review
Shorter duration
2.00×
Double speed
Half length duration
An audio speed changer for practice and review
Slow down a song online for practice
Hear a difficult passage at a calmer pace while the renderer targets the original pitch.
Speed up a song online for review
Move through a rights-cleared podcast, interview, or spoken recording in less time.
Test a target duration
Preview how a voiceover or music draft feels at a different length before making the final edit.
How it works
- 1
Open the workspace
Continue to the focused Speed Changer mode and choose a supported audio file from your device.
- 2
Choose a speed
Set a value from 0.5× to 2×. The renderer targets the original pitch with compensation while it changes duration.
- 3
Render and review
Create the local result, compare original and processed playback, and download the real WAV if it fits your use.
Local privacy boundary
- The source is processed locally in your browser.
- Refreshing clears the current source and result.
- Keep the page open while decoding or rendering.
Current output contract
- Speed from 0.5× to 2× in 0.05× steps.
- Pitch compensation targets the original pitch; artifacts are possible.
- Download the completed WAV result.
Frequently asked questions
Can I use this as a song speed changer?
Yes. Choose a song or other supported local audio file, set a speed from 0.5× to 2×, compare the original and changed result, and export the processed audio as WAV.
Can I slow down or speed up a song online?
Yes. Use the dedicated workspace to slow down a song online for practice or speed up a song online for faster review, while pitch compensation targets the original pitch.
Can I slow down audio without intentionally changing its pitch?
Yes. Speed Changer targets the original pitch by applying pitch compensation while changing duration. Extreme speed changes or difficult source material can still produce audible artifacts.
What speed range can I use?
The current workspace supports speeds from 0.5× to 2× in 0.05× steps. A slower setting makes the result longer; a faster setting makes it shorter.
Which audio formats can I use?
The current workspace accepts MP3, WAV, FLAC, M4A, AAC, and OGG files up to 50 MB and exports the processed result as WAV.
Is my audio uploaded?
No. This Speed Changer workflow decodes and renders the selected file locally in your browser. Keep the tab open while it works.
Can I compare the original and changed audio?
Yes. After a successful render, the workspace lets you play the original and processed result separately before downloading the WAV.
Will my task still be there after a refresh?
No. Refreshing clears the current source and result because this browser-local workflow does not store them in cloud history.
Ready to change the pace?
Choose the source inside the local workspace, set the speed, and review the real WAV before you export.
