Audio Extractor from Video

Fast, accurate and free online extractor audio from wideo tool running directly in your browser.

Secure (SSL)

Client-Side Processing

100% Free

Go to tool

Instructions

1

Enter data
Enter content, paste text or load a file from disk.
2

Click the button
The tool will immediately process your data in the browser.
3

Get the result
Copy the finished text or save the file to your device.

                                                function runTool() {

                                                  return "Result ready in 0.1s";

                                                }

Settings

Action

Settings JSON

0 characters

Result

Set the parameters and click \"Process\" to see the result.

Rate this tool:

Related tools

Other tools you may find useful

Audio from Video Extractor – FFmpeg WebAssembly Local

Extracting audio from video has traditionally required installing FFmpeg or uploading the file to a server. The tool uses FFmpeg compiled into WebAssembly (ffmpeg.wasm) - all processing is done locally in the browser. The video file never leaves your device.

audio extractor from video MP4 to MP3 online extract audio from video ffmpeg online without server

Supported input and output formats

Input (video): MP4 (H.264/H.265), WebM (VP8/VP9/AV1), MKV (Matroska), AVI, MOV (QuickTime), FLV. Output (audio): MP3 (MPEG Layer 3, 128/192/320 kbps), WAV (PCM, lossless), AAC (Advanced Audio Coding), OGG (Vorbis), FLAC (lossless compression). You choose the format and bitrate before extraction.

How FFmpeg WebAssembly works

ffmpeg.wasm is a port of FFmpeg (C++) compiled into WebAssembly by Emscripten. Runs in Web Worker (does not block UI). The video file is loaded into the WASM memory filesystem (Emscripten FS). Command: ffmpeg -i input.mp4 -vn -acodec copy output.mp3 (stream copy without recoding if the format is compatible).

Audio quality after extraction

Stream copy (-acodec copy): lossless, no degradation, fast (no decoding/encoding required). Recoding (-acodec libmp3lame -b:a 192k): when the output format is different from the source – minimal quality loss at 192+ kbps. For archiving: WAV (lossless). For distribution: MP3 192kbps or AAC 160kbps.

WebAssembly limitations

File size: depends on available browser RAM (files up to ~2GB are supported, depends on device). Performance: WASM is ~2-3× slower than native FFmpeg. For a 1GB file: ~1-3 min. Chrome and Firefox: Best WASM performance. Safari: Slower but supported.

Frequently asked questions

Is the video file safe - not sent to the server?

Yes – the tool works 100% locally (client-side). The file is loaded into the browser's memory and processed by WASM. No network requests during extraction (you can check in DevTools → Network). Your video stays private.

How to extract audio from YouTube?

YouTube prohibits downloads (ToS). The tool does not support YouTube URLs - only locally uploaded files. If you have your own video previously recorded from YouTube with the author's permission, you can extract the audio from the downloaded file.

Will I maintain stereo and surround quality?

Yes – copy stream retains the original channels (stereo, 5.1, 7.1). Recoding to MP3 supports stereo (2 channels). For surround in MP3: automatic conversion to stereo (downmix). For surround sound: use AAC or FLAC.

How does the extractor deal with long videos (2h+)?

WASM processing: ~1-5 min for a 2h file depending on hardware. In copy stream mode (without recoding) it is much faster. The tool shows a progress bar (% of seconds processed). The browser should not be closed during processing.

What is the difference between MP3 and AAC?

MP3 (MPEG-1 Layer 3): Older standard (1993), widely supported everywhere. AAC (Advanced Audio Coding): newer (1997), better quality at the same bitrate (128 kbps AAC ≈ 160 kbps MP3), default on iPhone/iPad/iTunes. For online streaming: AAC. For compatibility: MP3.

Related tools: Audio format converter, PDF text extractor and online video compressor.