Upload an audio file, then adjust the playback speed (50% to 200%). Pitch remains unchanged.

Click or drag & drop an audio file here

How to Change Audio Speed Online – Free Tempo Changer Guide

Learn how to speed up or slow down audio online without pitch distortion. Adjust playback rate from 50% to 200% while preserving original pitch. Ideal for musicians practicing solos, podcasters editing interviews, and audiobook listeners. Free, no signup.

How Does Tempo Shifting Work?

Tempo shifting changes the playback rate while preserving pitch using time‑stretching algorithms. Our tool uses FFmpeg's atempo filter, which modifies the audio speed without affecting the frequency content. The result is a natural‑sounding speed change, perfect for learning music, creating slow‑motion audio, or compressing long recordings.

Step‑by‑Step to Change Audio Speed

Upload your audio file (MP3, WAV, FLAC, etc.).
Use the slider or percentage input to set speed (50% = half speed, 200% = double).
Click 'Change Speed' – processing starts automatically.
Preview the adjusted audio using the MP3 version.
Download the speed‑changed file in the original format.

Frequently Asked Questions

1. Does speeding up audio affect pitch?

No, our tool uses time‑stretching that keeps the original pitch. It sounds like the audio is played faster or slower but voices and instruments remain at the same pitch.

2. Can I slow down a song to learn guitar or piano?

Absolutely. Slowing down to 50% or 75% makes complex passages easier to follow without changing the key.

3. What's the maximum speed range?

We support 50% to 200% (0.5x to 2.0x). For extreme speeds, you may notice artifacts. Use 100% for original.

4. Is my audio uploaded to a server?

No. All processing happens locally in your browser using FFmpeg.wasm. Your files stay private.

5. Why is the output file size different?

Changing speed changes duration. Slowing down (e.g., 50%) results in a longer file and slightly larger size; speeding up reduces size.

Adjust Audio Speed for Any Need

Whether you're a musician practicing solos, a podcaster editing interviews, or just want to listen to audiobooks faster, our free tempo shifter gives you full control. No signup, no watermarks, completely private.