Change audio speed and pitch
Speed up or slow down an audio file to a new tempo; the pitch changes with it, like playing a record faster or slower.
- Runs in your browser
- No upload
- Check before download
Files and content stay on this device. Aggregate action counts are sent only with your separate consent. MP3/Opus re-encoding loses original tags and may increase size. WAV is PCM. 32 MB/file, 120 seconds total, mono/stereo; 5 files for ordered concatenation. Speed changes pitch.
Change audio speed and pitch
- Prepare the input
Choose supported audio and a speed between 0.5× and 2×. This is deliberate resampling, so speed and pitch change together. Choose WAV to inspect the PCM directly, or a supported lossy output if you want to try for a smaller file.
- Try the worked example
At 2×, two seconds of source audio become one second of PCM output, and a 440 Hz test tone moves toward 880 Hz. At 0.5× the duration doubles and the pitch drops. Check that the resulting duration still fits within the 120-second limit.
- Check and save
Listen to the current saved output and compare its duration and pitch. This is not time stretching that preserves speech. Changing the speed invalidates the previous result. Keep the source so you can try another setting.
Questions
Can I speed up a voice without changing its pitch?
Not with this job. Speed and pitch are deliberately linked. Use a different workflow that preserves pitch, and only where its own documented profile supports what you need.
Why does slowing down cause a limit error?
A valid source can become too long after resampling. At 0.5×, the duration doubles, and the transformed PCM must still fit within the stated limits on audio time and memory.
Is every output exactly the requested duration?
The length of PCM audio is determined by the number of samples and the speed factor. MP3 and Opus can add codec delay or padding, so check the decoded content, and use WAV for the clearest comparison of sample counts.