Change Tempo (BPM)

Match a track to another tempo by entering the BPM you have and the BPM you want.

or drop it here

MP3, WAV, M4A, FLAC, OGG, Opus, AIFF, WMA, AMR and the sound of most videos. Files stay on your device.

How it works

Choose an audio file.
Enter the current BPM, or detect it, and the new BPM.
Preview the result.
Export and download.

BPM to BPM

Enter the tempo the track has now and the tempo you want, and the tool stretches the audio by the ratio between them. A 120 BPM track set to 128 BPM plays 6.7% faster, and the pitch and key stay the same. The new length is shown before you export.

If you do not know the current tempo, press Detect BPM. The detector listens for onsets and finds the most regular beat; it reports a confidence and offers the half and double time readings, because a steady pulse can be counted in more than one way.

Accuracy of BPM detection

Detection works well on music with a steady, clear beat. It is less reliable for rubato playing, ambient music, speech and tracks whose tempo changes. If the result looks wrong, tap the beat in the Tap Tempo tool or use the half or double time suggestion, and type the value.

The stretch assumes a constant tempo. A track with a tempo change will keep its internal proportions, and the whole file is scaled by one ratio.

Quality

Changes of up to about 10% are nearly transparent on most material. Large changes (beyond 0.5x to 2x) can smear transients. The ratio is limited to 0.25x to 4x.

Questions

Does changing the BPM change the key?

No. The pitch is kept. If you want the pitch to follow the speed, use the Change Audio Speed tool with "Speed (pitch changes)".

How do I match two tracks for a mix?

Detect or enter the BPM of each, then change one to the other. Small changes of a few percent sound the most natural.

The detected BPM is half or double what I expect. What now?

That is common. Use the half or double time button next to the result, or type the value.

Can it detect BPM without changing the file?

Yes, the BPM Detector tool shows the tempo and beat positions without processing the audio.