Extract Audio from Video

About Audio Extractor

This online audio extractor pulls the soundtrack out of video files directly in your browser, powered by FFmpeg.wasm (WebAssembly). It decodes common containers including MP4, WebM, MOV, MKV, AVI and M4V, then exports MP3, AAC, OGG, or lossless WAV and FLAC. You can extract the full track or trim a precise segment by start and end time. All processing happens locally on your device for complete privacy.

What video formats are supported?

The FFmpeg.wasm engine decodes most common containers, including MP4, WebM, MOV, MKV, AVI and M4V. The tool extracts the audio track and re-encodes it to your chosen output format.

What audio formats can I extract to?

You can extract audio to MP3, AAC, WAV, OGG, and FLAC. MP3 is the most compatible format and works on all devices.

Will extraction affect audio quality?

The tool always re-encodes to the format you select; it does not stream-copy the original audio. For lossy targets (MP3, AAC, OGG) the audio is encoded at your chosen bitrate, so a higher bitrate means better quality and a larger file. For WAV (PCM) and FLAC the output is lossless, so quality is preserved regardless of the bitrate dropdown.

What is the file size limit?

The maximum video file size is 1GB. Files over 500MB may take longer to process and use significant memory. For optimal performance, use videos under 500MB when possible.

What if my video has no audio?

The tool will detect if the video has an audio track. If no audio is found, you'll be notified and extraction will not proceed.

Is my video file safe?

Absolutely! All audio extraction happens directly in your browser using FFmpeg.wasm (WebAssembly). Your video file is never uploaded to any server. Everything stays private on your device.

Can I preview the audio before downloading?

Yes! After extraction, you can preview the audio file before downloading to ensure it's correct.

How long does extraction take?

Extraction time depends on the video length, output format and your device. Re-encoding a typical 5-minute clip usually takes a few seconds to about 30 seconds. Trimming to a short range with the start/end fields is much faster because the engine seeks to the segment instead of decoding the whole file.

Can I extract only part of a video?

Yes. Set a Start Time and End Time in the Trim Range fields (HH:MM:SS, MM:SS, or plain seconds). The tool seeks to the start before decoding and stops at the end, so you get just that segment. This is ideal for grabbing a quote, a music cue or a single line of dialogue, and it keeps the output small.

Which output formats are lossless and which are lossy?

WAV (PCM) and FLAC are lossless: they reproduce the decoded audio exactly. FLAC also compresses, so it is smaller than WAV for the same audio. MP3, AAC and OGG are lossy: they discard some data to shrink the file, controlled by the bitrate you pick.

What about sample rate and mono vs stereo channels?

By default the tool keeps the source sample rate (commonly 44.1 kHz or 48 kHz) and channel layout (usually stereo). Lossless WAV at 44.1 kHz / 16-bit stereo is about 1411 kbps, which is why the kbps dropdown does not apply to WAV or FLAC.

How do bitrate and file size relate?

For lossy formats, file size is roughly bitrate multiplied by duration: about (bitrate in kbps / 8) kilobytes per second. For example 192 kbps for 3 minutes is around 4.3 MB. Higher bitrate means better quality but a bigger file.