Audio Speed Changer — Slow Down or Speed Up Any Audio
Change audio playback speed online for free. From 0.25x to 4x — no pitch shifting, no quality loss. Runs entirely in your browser.
Drop your audio here
or click to browse — MP3, WAV, OGG, AAC, FLAC and more
Browser-Native Audio Speed Control
FFmpeg tempo filter with preset speeds and custom control — no software required.
0.25x to 4x Speed Range
From quarter speed for detailed listening to 4x for rapid review. Choose a preset or enter a custom speed.
No Pitch Shift
FFmpeg's atempo filter changes the tempo without altering the pitch. Slow down audio without chipmunk or deep effects.
100% Private — No Upload
FFmpeg runs as WebAssembly in your browser. Your audio file never leaves your device.
All Major Formats
Speed-change MP3, WAV, OGG, AAC, FLAC, and more. Output stays in the same format as your input.
Instant Preview
Listen to the original before processing. Compare before and after in your browser directly.
Custom Speed Input
Not satisfied with presets? Enter any speed from 0.1x to 4x for full control over tempo.
Who Uses Audio Speed Changer
Students, language learners, podcast listeners, and music producers who need flexible audio speed control.
Students & Language Learners
Slow down lectures, podcasts, and language lessons to catch every word and improve comprehension.
- Slow down fast speakers
- Review recorded lectures at 0.75x
- Study language pronunciation
Podcast & Audiobook Listeners
Speed up long-form audio content to save time without missing any detail.
- Listen at 1.5x or 2x speed
- Review audio notes faster
- Power through long audiobooks
Musicians & Producers
Slow down solos to transcribe notes, or speed up samples to match the tempo of your track.
- Slow down guitar solos to transcribe
- Adjust sample tempo for DAW import
- Analyze timing at reduced speed
How to Change Audio Speed in 3 Steps
Upload your audio file by dragging & dropping or clicking to browse your files.
Choose a speed preset (0.5x, 0.75x, 1.5x, 2x, etc.) or enter a custom speed value.
Click Change Speed and download your processed audio file — same format, adjusted tempo.
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Frequently Asked Questions
Common questions about changing audio speed online.
Does changing the speed affect the pitch?
No. The tool uses FFmpeg's atempo filter which changes the tempo without shifting the pitch. A voice slowed to 0.75x still sounds natural — not unnaturally deep.
What speed range is supported?
You can change speed from 0.25x (quarter speed) to 4x (four times faster). For speeds outside the 0.5–2.0 range, the tool chains multiple atempo filters automatically.
Is my audio uploaded to a server?
Never. FFmpeg runs as WebAssembly directly in your browser. Your audio file never leaves your device — no upload, no server processing.
What audio formats are supported?
MP3, WAV, OGG, AAC, FLAC, and most other common audio formats. The output is saved in the same format as the original file.