MP3
Useful for speech, music, podcasts, and recordings. Actual decoding depends on the codec inside the file and your browser support.
Browser-based processing
Audio Speed Changer
Speed up or slow down speech and music from 0.25× to 4× while preserving the original pitch.
No uploadMediaBunny WorkerMP3 output
01
Private by default
Your file stays in this browser
02
Pitch preservation
Keep voices and music natural
03
Preview first
Compare the source and result
Step 1
Add your audio
Drop one audio file here, or browse your device.
Files are processed in this browser on this device and are never uploaded.
Audio speed guide
Supported audio formats
Change the speed of common compressed, lossless, and recording formats. The default MP3 output is easy to play, share, and use in learning workflows.
WAV
Useful for speech, music, podcasts, and recordings. Actual decoding depends on the codec inside the file and your browser support.
M4A
Useful for speech, music, podcasts, and recordings. Actual decoding depends on the codec inside the file and your browser support.
AAC
Useful for speech, music, podcasts, and recordings. Actual decoding depends on the codec inside the file and your browser support.
FLAC
Useful for speech, music, podcasts, and recordings. Actual decoding depends on the codec inside the file and your browser support.
OGG / Opus
Useful for speech, music, podcasts, and recordings. Actual decoding depends on the codec inside the file and your browser support.
How to change audio speed online
No installation or account is required. Choose a file, set the multiplier, preview the result, and download when it sounds right.
- 01
Add an audio file
Drop in an MP3, WAV, M4A, AAC, FLAC, OGG, or Opus file, or browse your device.
- 02
Choose a speed
Use a preset such as 0.5×, 0.75×, 1×, 1.5×, or 2×, or set any value from 0.25× to 4× with the slider.
- 03
Keep or change the pitch
For speech and music, keep pitch preservation enabled so faster audio does not sound sharp and slower audio does not sound too low.
- 04
Process, preview, and download
The browser processes the file in a local Worker. Preview the result, then download the MP3 when it is ready.
Common audio speed changer use cases
Changing speed is useful for learning, editing, content production, and organizing personal recordings—not just for making audio faster.
Speed up courses and podcasts
Listen at 1.25× or 1.5× to review lessons faster while keeping the speaker’s voice natural.
Create slow practice material
Slow down language lessons, pronunciation examples, or instrument exercises for careful repetition.
Review meetings and interviews
Scan a long recording at a faster speed, then export a version that is easier to share or archive.
Create a timing variation
Adjust music, voice-over, or cue audio to fit a video edit, short clip, or social post.
Your audio stays on your device
The File API and MediaBunny Web Worker read, retime, and encode the audio in your browser. Source files are not uploaded to MediaKit servers; removing a file or closing the page releases local object URLs and Worker resources.
FAQ
Audio speed changer FAQ
Are my audio files uploaded?
No. Speed processing runs locally in your browser, and the selected file is only passed to a Worker on this device.
Which input formats are supported?
MP3, WAV, M4A, AAC, FLAC, OGG, and Opus are supported in common browser environments. Decoding still depends on the codec inside the file.
How do I keep the voice from changing pitch?
Turn on Keep original pitch. The time-stretch path changes duration while keeping speech and music closer to their original key.
What speed range is available?
The current range is 0.25× to 4×. Try 0.5× for practice and dictation, or 1.25× to 2× for lessons and podcasts.
Why can large files take longer?
The browser must decode, retime, and re-encode the audio. Larger files and devices with less memory need more time, so keep the tab open.
Why is the default output MP3?
MP3 plays on most phones, computers, cars, and sharing platforms. Keep the original WAV or FLAC when you need lossless editing later.
Keep working with audio
Related tools and tutorials
Trim audio
Remove unwanted sections before changing the speed.
Open toolConvert audio format
Export the result as WAV, FLAC, M4A, AAC, OGG, or Opus.
Open toolCompress audio
Reduce the file size before sharing or uploading.
Open toolExtract audio from video
Take speech, music, or interviews out of a video first.
Open tool