Change Audio Speed Online, Free, Speed Up or Slow Down
File Tools Online · July 2026 · 5 min read
Slowing a song down to learn a guitar riff note-by-note, or speeding up a two-hour podcast to get through it on a commute, changing audio playback speed serves two very different audiences with the same underlying need: control over tempo without losing audio quality.
Speed Changes Without the Chipmunk Effect
This tool uses FFmpeg's atempo filter, which changes playback speed while keeping pitch natural, so slowing a track down to 0.75x doesn't drop the pitch into a warped, deep voice, and speeding one up to 2x doesn't create the classic "chipmunk" pitch-up that basic speed changes often cause.
Two Audiences, One Tool
Musicians use slowed-down audio to learn parts by ear, practicing a phrase at 0.75x or even slower before working back up to full speed. Podcast and audiobook listeners go the other direction, speeding up narration to 1.25x-2.0x to save time without missing words.
How to Change Audio Speed Online
- Create a free account. No credit card required.
- Go to Tools → Audio Tools → Audio Speed.
- Upload your audio file and choose a speed: 0.75x, 1.25x, 1.5x, or 2.0x.
- Download the speed-adjusted audio file.
- Your original file is deleted from the server within 30 minutes.
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Use Audio Speed Now →Related Reading
Looking to change pitch instead of speed? See changing audio pitch without changing speed (and vice versa).
Frequently Asked Questions
Will changing speed make my voice sound like a chipmunk?
No, the atempo filter preserves natural pitch while changing tempo, avoiding the pitch-shift distortion that basic speed changes cause.
How do I slow a song down to learn an instrument part?
Choose a slower speed setting such as 0.75x, which reduces tempo while keeping the pitch natural enough to follow the original notes.
Can I speed up a podcast or audiobook?
Yes, speeds up to 2.0x are available, a common range for comfortably speeding up spoken-word content.
What audio formats are supported?
MP3 and WAV files are both supported.
Does the output file have a watermark or audible artifact?
No, and the tempo change is applied cleanly without added noise or artifacts.