Do you upload my audio?
No. Speed processing runs locally in your browser.
Free Online Audio Speed Changer
Speed up or slow down any MP3 or audio file — free, instant, right in your browser. Play it back at the new speed live. No upload, no sign-up.
Frequently asked questions
Does changing speed affect pitch?
This tool currently adjusts speed by resampling, so pitch may change. Pitch-preserving tempo is planned.
Will this reduce quality?
Speed changes require decoding and re-encoding. Keep moderate settings for the best quality.
Which browsers are supported?
For best results, use the latest Chrome / Edge with WebCodecs support.
What formats are supported?
Common audio inputs work, and output supports MP3/WAV/AAC.
Is there a limit on file size?
Processing runs locally, so very large files may take longer depending on your device.