Audio Speed Changer Online Free — Slow Down or Speed Up MP3
Speed up or slow down audio · Pitch preserve · Pitch shift · Podcast mode · 100% browser
Change the playback speed of any audio file online. Slow down to 0.25x for music practice or transcription, or speed up to 4x for faster podcast listening. Preview in browser, download as WAV.
Audio File Upload Karo
Audio drag karo ya click karo
MP3 · WAV · FLAC · OGG · M4A
Audio Speed Changer Kaise Use Karein
Step-by-Step — Podcast 1.5× Speed
- Upload: MP3 ya WAV upload karo
- Preset: 1.5× preset click karo ya slider adjust karo
- Preserve Pitch ON: Voice natural rehega chipmunk effect nahi aayega
- Preview: Play button se listen karo
- Export: WAV download karo lossless quality mein
Frequently Asked Questions
Does changing speed affect pitch?
By default yes — slowing down lowers pitch and speeding up raises it. Enable the Pitch Preserve toggle to maintain original pitch while changing speed.
What speed range is supported?
0.25x (quarter speed) to 4x (quadruple speed). 1x is the original speed.
Is pitch preservation perfect?
Browser-side pitch preservation uses basic time-stretching. It is good for speech and simple music but may have artifacts on complex audio at extreme speeds.
What is the output format?
WAV format. The output duration changes proportionally — 0.5x speed produces a file twice as long.
Can I change speed without re-encoding?
The BufferSourceNode.playbackRate is used with OfflineAudioContext to render the speed-changed audio to a new buffer, which is then exported as WAV.