X Sample Rate Converter

Sample rate is the number of audio samples captured per second. 44,100 Hz (CD standard) and 48,000 Hz (video standard) are the most common. When your audio file does not match your project's sample rate - for example a 44.1 kHz music track in a 48 kHz video project - the audio will play back at the wrong speed or pitch unless it is resampled. Sample rate conversion recomputes the waveform at the new rate without changing pitch or duration.

The online tool uses FFmpeg's SWR resampler on our server - good quality and convenient for occasional use. The Windows desktop app uses the soxr (SoX resampler) library at Very High Quality (VHQ) mode, which uses a much steeper anti-aliasing filter and produces audibly superior results, especially when downsampling from high sample rates. For professional or archival use, the desktop app is recommended.

No. Upsampling - converting from a lower sample rate to a higher one - does not add any audio information that was not in the original recording. A 44.1 kHz file upsampled to 96 kHz is still a 44.1 kHz recording in terms of frequency content. Upsampling is useful for matching project requirements or for giving your DAW or digital-to-analog converter more headroom when processing, but it does not increase perceived quality.

No. Your file is uploaded over HTTPS, resampled with FFmpeg, and the output is streamed directly back to your browser. Both the input and output files are deleted from the server immediately after the download completes. Any orphaned temp files from dropped connections are automatically removed after 4 hours.

16-bit PCM is the standard for final delivery - CD quality, compatible everywhere, and produces files half the size of 24-bit. 24-bit PCM is recommended for studio work, mixing, and mastering since it provides more headroom and reduces quantization noise during processing. 32-bit float is ideal if you plan to do further processing in a DAW, as it cannot clip regardless of gain changes. For straightforward resampling to deliver a file for video or streaming, 16-bit is almost always the right choice.