Sample Rate Converter

A sample rate is the number of times per second that audio is measured (sampled) when converting from analog to digital. It's measured in Hertz (Hz). Higher sample rates capture more detail. 44,100 Hz is the CD standard, 48,000 Hz is the standard for video production, and 96,000 Hz or 192,000 Hz are considered high-resolution audio.

Common reasons to resample include: preparing audio for video (converting 44.1 kHz music to 48 kHz for video editors), matching DAW project settings (ensuring all files in a session use the same rate), reducing file size (downsampling hi-res files for everyday listening), and meeting broadcast standards (radio and TV often require specific sample rates).

Downsampling (e.g. 96 kHz to 44.1 kHz) removes frequencies above the new Nyquist limit, but this is usually inaudible since those frequencies are above human hearing range (~20 kHz). Upsampling (e.g. 44.1 kHz to 96 kHz) does not add new audio information — it interpolates between existing samples. The quality of the resampling algorithm matters; this tool uses the browser's built-in high-quality resampler.

44.1 kHz was chosen as the CD standard and is the most common rate for music. 48 kHz is the standard for video, film, and broadcast. Both can reproduce frequencies up to ~20 kHz (the limit of human hearing). If your audio is for music-only use, 44.1 kHz is fine. If it's for video or broadcast, use 48 kHz.

No. All audio processing happens entirely in your browser using the Web Audio API. Your file is decoded, resampled, and re-encoded locally on your device. Nothing is uploaded to any server. The converted file is downloaded directly to your computer.

Common reasons include: converting 96 kHz studio files to 44.1 kHz for CD burning, matching your DAW's project sample rate, converting 48 kHz video audio to 44.1 kHz for music distribution, or upsampling for compatibility with high-resolution audio players.