Audio Speed Changer
Change the playback speed and tempo of audio files
Upload Audio File
Drag and drop to start, or use the file picker.
Supports MP3, WAV, OGG, FLAC, AAC, M4A
Privacy & Trust
Client-side conversion
Audio is decoded and re-encoded in the browser before download.
Immediate preview
Listen to the source and the latest exported result in the same session.
Format-aware export
Switch between WAV, MP3, OGG, and WebM without leaving the page.
Export Workspace
Upload an audio file to start an export session.
Format
Suggested Next Steps
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How to Use
Upload Your File
Drag and drop your file or click to browse. Your file stays in your browser.
Adjust Settings
Configure options to get exactly the result you need.
Download Result
Process and download your file instantly — no waiting, no server upload.
Why Use This Tool
100% Free
No hidden costs, no premium tiers — every feature is free.
No Installation
Runs entirely in your browser. No software to download or install.
Private & Secure
Your data never leaves your device. Nothing is uploaded to any server.
Works on Mobile
Fully responsive — use on your phone, tablet, or desktop.
Your Files Stay Private
This tool processes your files entirely in your browser. Nothing is uploaded to any server — your data never leaves your device.
- No server upload — 100% client-side processing
- No data stored — files are discarded when you close the tab
- No account required — use instantly without signing up
How Audio Speed and Pitch Shifting Work
Key Takeaways
- Time-stretching changes speed without altering pitch, unlike simple resampling which affects both.
- Common ranges are 0.5x (half speed) to 2.0x (double speed) for practical listening.
- The Web Audio API's playbackRate property enables real-time speed changes directly in the browser.
Changing audio playback speed is useful for studying, transcription, music practice, and content consumption. Modern time-stretching algorithms can speed up or slow down audio while preserving the original pitch, so voices sound natural even at 1.5x speed. This tool processes your audio files entirely in your browser.
1.5×
Optimal study speed
Common Use Cases
Podcast & Audiobook Speed Listening
Listen at 1.25x–1.5x speed to consume more content in less time without losing comprehension.
Music Transcription
Slow down complex passages to 0.5x or 0.75x to hear and transcribe individual notes and chord voicings.
Language Learning
Slow native speaker audio to catch pronunciation details, then gradually increase speed as listening skills improve.
Dance & Choreography
Slow down music to learn complex choreography step by step, then bring it back to full speed as the routine becomes comfortable.
Speed Adjustment Tips
Start with small increments (1.1x, 1.25x) for spoken content. Jumping to 2x drops comprehension significantly.
For transcription, 0.75x is often the sweet spot — slow enough to hear details but fast enough to maintain context.
Export the adjusted file if you want to transfer it to a device that doesn't support variable playback speed.
Pitch-preserved speed change (time stretching) sounds more natural than simple resampling, especially for speech.
All audio processing is performed entirely in your browser. No audio files are uploaded or transmitted to any server.