Change Audio Speed
Speed up podcasts or slow down music tracks without altering the pitch. Processed securely entirely inside your browser for ultimate privacy.
Choose an Audio file
Or drag and drop your file here
Processed securely on your device. No files are uploaded to our servers.
audio.mp3
0 MB • Orig. Duration: 00:00
Adjust slider to preview speed live.
If the engine fails to load, verify your site has an SSL certificate (HTTPS) and Cross-Origin headers are enabled in your .htaccess file.
Loading Audio Engine
Fetching local processing core...Changing Tempo...
Processing locally...How to Change Audio Speed Online
Speed up long podcast episodes or slow down fast music tracks to learn lyrics. Easily change tempo in three simple steps.
Upload Your Audio
Select your MP3, WAV, or M4A file. Our tool loads it securely and locally right inside your browser window without remote uploads.
Adjust the Speed
Use the slider to set the playback speed anywhere from 0.5x (half speed) to 2.0x (double speed). Press play to preview it live.
Process and Download
Click to change speed. Our engine applies an advanced time-stretch filter, keeping the pitch identical, and provides an MP3 to download.
Benefits of Our Speed Changer
No "Chipmunk" Voices
Most basic tools speed up both the tempo and the pitch, causing voices to sound squeaky. Our advanced 'atempo' filter changes the speed while preserving the original pitch.
100% Private (No Uploads)
Traditional tools force you to upload personal recordings to their servers. We use WebAssembly to modify your file directly inside your browser. Your data never leaves your device.
Live Preview
Don't guess how fast it will sound. As you drag the slider, hit the play button on our built-in audio visualizer to hear a live preview of your new speed settings instantly.
High Quality Export
When the speed is adjusted, the file must be re-encoded. Our engine ensures the newly paced track is exported as a crisp, standard 192k MP3 file.
Frequently Asked Questions
No. Unlike standard fast-forwarding, our engine utilizes "time-stretching" technology. This separates the tempo from the pitch, meaning voices will speak faster but retain their natural, deep tone.
Yes, it is entirely private. Toolszu uses modern WebAssembly technology to process your audio file entirely within your browser's memory. The file is never uploaded to our servers.
If you speed up the audio (e.g., to 1.5x), the total duration shrinks, which generally results in a smaller file size. If you slow it down (e.g., to 0.5x), the duration increases, resulting in a larger file size.
You can upload a video file (like an MP4), and our engine will extract the audio track from it, change the speed, and provide you with an MP3 audio file. It will not return a video file.
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