Tempo control
Free Online Audio Speed Changer
Change playback tempo for podcasts, practice tracks, transcripts, and sound design. Use pitch-preserving FFmpeg filters for speech and music, or disable pitch lock for creative effects.
Perfect for voice notes, podcast review, and practice material when you need fast, local processing.
Uses FFmpeg tempo filters for reliable speed changes instead of fragile browser hacks.
Try multiple speed presets quickly and keep the final decision entirely on your device.
Drag & drop audio here, or click to upload
Supports MP3, WAV, M4A, FLAC, OGG, AAC, and more
How to change audio speed online
- 1.Upload an audio file and wait for the browser to read its duration and sample rate.
- 2.Choose a speed preset or use the slider for fine control. Leave pitch lock on for natural-sounding speech and music.
- 3.Export the processed file as MP3 or WAV and download it when FFmpeg finishes.
Why use this speed changer?
Ideal for learning and review
Slow down guitar phrases, language lessons, and interviews without moving them into another editor.
Fast review workflows
Speed up long podcasts, standups, or reference tracks when you need to scan the material quickly.
Pitch lock when you need it
Pitch-preserving filters are better for dialogue, while pitch shifting is useful for creative sound design.
Accurate browser-side estimates
The page shows the approximate new duration before you process the final file.
Common use cases
- •Slow down instrument practice material to hear details clearly.
- •Create faster review versions of lectures, webinars, and interviews.
- •Generate stylized chipmunk or slowed effects by turning pitch lock off.
- •Prep alternate tempo versions of narration before final editing.
Tips for better speed edits
- •For dialogue, 0.85x to 1.35x usually keeps the most natural results.
- •Extreme slowdowns can make room tone and mouth noise more obvious, especially on compressed MP3 sources.
- •If you want to continue editing later, export WAV first so you avoid multiple rounds of lossy compression.
Speed changer FAQ
What does preserve pitch do?
It keeps voices and instruments in roughly the same key while changing playback speed. This is the most useful mode for speech and music practice.
How far can I change the speed?
This tool supports values from 0.25x to 4x. Very extreme settings are best for effect work rather than natural listening.
Why does pitch shift mode need the sample rate?
FFmpeg changes pitch and speed together by altering playback rate, which depends on the original sample rate of the decoded file.
Is browser processing good enough for long audio?
Yes for many everyday tasks, but very large files still depend on the RAM and CPU available on your device.