AK
appkiro.comUpload Audio
Add your audio file
Adjust Speed
Choose speed and preview
Download
Download your processed audio
Drag & drop your audio file here
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Supports: MP3, WAV, M4A, AAC, OGG, FLAC, OPUS, WMA
Max file size: 200MB
Change audio speed without affecting pitch.(Pitch will remain the same)
Choose format and download your processed audio.
Your files are secure and will be deleted automatically after processing.
Pitch preserved
WSOLA stretching keeps voices natural
Fade and normalize
Smooth ramps and consistent loudness
Browser-only
Files never leave your device
Multiple formats
MP3, WAV, M4A, OGG, FLAC export
Wide input support
MP3, WAV, M4A, AAC, OGG, FLAC, Opus
Private
No upload, no signup, no watermark
Change Audio Speed lets you slow down or speed up MP3, WAV, M4A, AAC, OGG, FLAC, and Opus files without affecting their pitch. The result renders in your browser using a WSOLA time-stretching algorithm and is encoded back into the format you choose.
Use the slider for precise control or the quick buttons for common speeds (0.25× / 0.5× / 0.75× / 1× / 1.25× / 1.5× / 2×). Presets cover the most useful settings at one click. The 0.5× – 2× range produces the cleanest output.
Add a Fade In or Fade Out to soften abrupt starts and stops. Switch Quality to balance fidelity against processing time. Enable Normalize Audio to push the loudest peak close to full scale without clipping.
Files stay in your browser. Maximum file size is 200 MB. For related utilities try the Audio Trimmer, Audio Effects, or Audio Normalizer.
What does Change Audio Speed do?
It stretches or compresses the timeline of an audio clip while preserving the original pitch. Slow it down to study or transcribe, speed it up to consume audio faster — voices stay natural rather than turning into chipmunks or grumbles.
Who needs a speed changer?
Language learners practising listening, podcasters dropping ads, students reviewing lectures, musicians slowing solos to learn licks, and anyone who consumes long-form audio.
When should I lower the quality?
Use High for music. Use Medium for spoken word — almost as good and noticeably faster. Use Low only when working with very long files where speed of processing matters more than fidelity.
Where does the audio go?
Nowhere. Decoding, time-stretching, and re-encoding all happen inside your browser. The file never leaves your device.
Why does the output sound slightly different?
Time-stretching is an approximation — at extreme speeds (below 0.5x or above 2x) you may hear faint phase artefacts. Stay between 0.5x and 2x for the most transparent result.
How do fade in / fade out work?
Fade In ramps the volume up from silence at the start, Fade Out ramps it down at the end. Set both to 0 to keep the original volume envelope.