Audio Speed Changer
Change audio playback speed without changing pitch, then download.
Drop an audio file or click to upload
MP3, WAV, OGG, FLAC, AAC · max 100 MB · max 10 min
This tool changes an audio file's playback speed using an atempo filter, which adjusts speed while keeping the pitch natural (rather than the chipmunk/slow-motion pitch shift you'd get from simply speeding up or slowing down raw audio) - useful for speeding up a long recording to review quickly, or slowing down music/speech to study details.
Frequently asked questions
The atempo filter is specifically designed to change speed while preserving natural pitch, avoiding the chipmunk/slow-motion pitch-shift effect you'd get from naive speed changes.
Typically a range covering both slower (for careful listening/study) and faster (for quick review) playback, though extreme speed changes can start to introduce some audible artifacts regardless of the pitch-preserving technique.
The atempo approach keeps pitch very close to natural at moderate speed changes; extreme speed adjustments may introduce subtle artifacts even with pitch correction applied.