Change Sample Rate

Resample a file to the rate your project, device or platform needs.

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.
Pick the new sample rate from the presets, or type one.
Click Resample.
Download the resampled file.

What changing the rate does

The sample rate is how many times per second the sound is measured. Resampling recalculates the audio at a new rate and keeps the duration and pitch the same. Common targets are 44.1 kHz (CD and most music), 48 kHz (video and most production), 96 kHz (high-resolution), 16 kHz or 8 kHz (speech and telephony), and 22.05 or 11.025 kHz (older and small files).

Choose a preset or type any rate from 4,000 to 384,000 Hz.

Quality

The resampler uses a windowed-sinc filter. When the rate goes down it first removes everything above half the new rate, so those frequencies do not fold back as aliasing; they are lost, which matters from about 16 kHz downwards. When the rate goes up, no detail is added: the audio keeps its original bandwidth at a higher rate. Converting down and then up again does not restore what was removed.

Going between 44.1 and 48 kHz is the most common job and is not audible to most listeners.

Format limits

Some formats only allow certain rates: MP3 up to 48 kHz, WMA up to 48 kHz, AMR only 8 kHz, Opus only 48 kHz. The page shows a note when the chosen format needs a different rate. WAV, AIFF and FLAC accept all the presets.

Questions

Does a higher sample rate sound better?

Not by itself. Converting a 44.1 kHz file to 96 kHz does not add detail. The rate only matters for what the file was recorded or mastered at.

How do I convert 44.1 kHz to 48 kHz?

Choose 48 kHz in the list and press Resample. The duration and pitch stay the same.

Will resampling lose quality?

Going up in rate loses nothing. Going down removes the frequencies above half the new rate. A lossy format such as MP3 is encoded once more at the new rate.

Why did the output use a different rate from the one I chose?

The output format may not support it. MP3, WMA, AMR and Opus allow only certain rates. The page tells you which one it used.