Speed up or slow down audio files with precise control from 0.25x to 4x. Preserve pitch for natural sound or disable it for creative effects. Supports MP3, WAV, FLAC, AAC, OGG, M4A, and WMA. 100% free, no signup, all processing happens in your browser.
Audio Speed Changer
Load the audio engine to start changing audio speed. Processing happens entirely in your browser.
Speed up audio from 1x to 4x for faster listening
Slow down audio from 1x to 0.25x for detailed analysis
Preserve pitch option to maintain natural sound at any speed
Disable pitch preservation for creative chipmunk or slowed effects
Speed slider with 0.25x step increments for precise control
Output to MP3, WAV, FLAC, AAC, OGG, M4A, or WMA formats
Drag and drop file upload for quick access
Audio preview player to listen before downloading
Play original audio for side-by-side comparison
100% client-side processing with FFmpeg - files never leave your device
Speed up podcasts to 1.5x or 2x to get through episodes faster without losing comprehension.
Slow down foreign language audio to 0.5x or 0.75x to catch every word and improve pronunciation.
Slow down complex musical passages to practice along at a comfortable tempo, then gradually speed up.
Slow down interviews and recordings to make manual transcription easier and more accurate.
Speed up audiobooks to finish books faster while still following the narrative.
Adjust track tempos for beatmatching and creative remix work without altering pitch.
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The fastest, most private way to change audio speed online. Your files never leave your device.
Adjust speed from 0.25x to 4x in 0.25x steps. Fine-grained control for any use case.
Keep the original pitch intact when changing speed, or disable it for creative effects.
Audio files never leave your device. All processing happens locally in your browser.
Powered by FFmpeg WebAssembly for near-native speed audio processing right in your browser.
Use on any device with a modern browser. No software installation required.
Export your speed-adjusted audio in MP3, WAV, FLAC, AAC, OGG, M4A, or WMA format.
More free tools for audio and media
Adjusting audio speed is useful across many scenarios. Speed up podcasts and audiobooks to consume content faster. Slow down music passages for practice or transcription work. Language learners benefit from slowed-down speech to catch every syllable. Our free audio speed changer handles all of these needs directly in your browser.
When you change audio speed without pitch preservation, the pitch shifts proportionally - faster audio sounds higher and slower audio sounds lower. Our pitch preservation feature uses the FFmpeg atempo filter to decouple speed from pitch, maintaining natural-sounding voices and instruments at any playback rate.
Unlike online tools that upload your audio to remote servers, our speed changer processes everything locally in your browser using FFmpeg WebAssembly. Your audio never leaves your device, making this tool ideal for sensitive recordings, private conversations, or proprietary audio content.
For speech content like podcasts and audiobooks, speeds between 1.25x and 2x work well with pitch preservation enabled. For music practice, slowing to 0.5x or 0.75x lets you focus on complex passages. Start with moderate speed changes and adjust as needed. Always preview the result before downloading.