Free Audio Speed Changer Online
Speed up or slow down any audio file from 0.25× to 4×. Uses OfflineAudioContext playback rate — changing speed also changes pitch (natural behaviour). Download as WAV.
Drop audio here or browse
MP3, WAV, OGG, AAC, FLAC
Speed Multiplier
1.0×
0.25× (slow)1× (normal)4× (fast)
Processing…
Rendering at new speed.
✓ Speed applied!
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About Audio Speed Changer
Changes audio playback speed by rendering the audio buffer through an OfflineAudioContext with a modified playbackRate value. At speeds other than 1×, pitch also changes proportionally (e.g., 2× speed = 1 octave higher pitch). This is the natural behaviour of tape-speed changes. The output duration changes inversely to the speed multiplier.
Common uses: Speed up podcasts or lectures (1.5–2×), create chipmunk effects (2–4×), slow down music to learn by ear (0.5–0.75×).