Change the tempo of your music or voice recordings. Useful for practicing instruments, transcribing, or creating nightcore/slowed effects.
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Audio Speed Changer
Speed up or slow down audio files without changing pitch (simple resampling). Free online tool. Fast, free, and 100% private. All processing happens locally.
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Select files or drag & drop here
Processed 100% locally in your browser. Your files never touch an external server.
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100% Client-Side Privacy•No File Size Limits•Free Forever
About Audio Speed Changer
FusioFiles 100% Client-Side Privacy Guarantee
Your files and data never leave your browser — processed directly on your device.
Zero Server UploadsExecution occurs entirely in browser memory via WebAssembly and HTML5 Canvas.
HIPAA & GDPR ReadySafe for confidential tax forms, medical records, financial sheets, and legal contracts.
Zero Cloud LatencyInstant results with no upload delays, server queues, or third-party tracking.
Automatic RAM PurgeBuffers and caches are automatically wiped clean the instant you close the tab.
1
Select Sound
Upload the MP3 or WAV file you wish to modify.
2
Adjust Tempo
Use the slider to increase or decrease the playback speed.
3
Export Audio
Download the processed audio file with your changes applied.
Key Features
Wide Range
Adjust speed from 0.5x slo-mo to 2.0x fast-forward.
Format Support
Works with MP3 and WAV files.
Client Side
Process audio securely in your browser.
WAV Export
Download the modified track as a high-quality WAV.
Frequently Asked Questions
Current implementation changes speed by resampling, which may affect pitch slightly depending on the method. We are working on pitch-preserving timestretch.
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