Can I extract audio from MP4 videos without losing quality?

Yes — if your MP4 contains AAC audio and you extract to AAC (.m4a) or MP4 audio, FFmpeg uses stream copy mode, which extracts the audio bitstream without any decoding or re-encoding. The output is bit-for-bit identical to the audio as stored in the original MP4, with no quality loss whatsoever. If you extract to a different format (e.g., MP3), a transcode occurs with minimal quality loss at high bitrates (192+ kbps). For transparent lossless extraction, choose an output format that matches the source audio codec.

What video formats are supported for audio extraction?

The extractor supports all common video containers handled by FFmpeg: MP4 (.mp4, .m4v), WebM (.webm), Matroska (.mkv), QuickTime (.mov), AVI (.avi), and Flash Video (.flv). Audio output formats include MP3, AAC/M4A, OGG Vorbis, WAV (PCM), and FLAC. If your video format is not listed, it is likely still supported — FFmpeg's WASM build includes a comprehensive codec library covering virtually all formats in common use.

How is extracting audio in a browser possible without uploading the file?

The tool uses FFmpeg compiled to WebAssembly (WASM) — a portable binary instruction format that modern browsers can execute at near-native speed. When you select a video file, it is read by the browser's File API into memory and passed to the FFmpeg WASM runtime, which performs all demuxing and transcoding operations locally. No data is sent over the network at any point. The WASM binary is downloaded once from our CDN and cached by your browser for use in future sessions.

OmniToolsKit

Extract Audio from Video

Name: Extract Audio from Video
Rating: 5 (2 reviews)
Author: OmniToolsKit

Extract the audio track from any video file. Supports MP4, WebM, MKV, AVI, and more.

Video to AudioMP3/WAV ExtractBrowser-basedNo Upload

Extract Audio

Upload a video file to extract its audio track.

Drag & drop a video file, or click to select

Supports MP4, WebM, MKV, AVI, MOV, FLV, WMV

Download Extracted Audio

Download your extracted audio file here.

No Audio Files Yet

Upload and extract audio from video files to see them appear here for download.

About this tool

Extract the audio track from video files (MP4, WebM, MKV, MOV) and save it as MP3, AAC, OGG, or WAV — entirely in your browser. Lossless stream copy for matching codecs preserves original audio quality with no re-encoding.

About

Extract Audio From Video Files Online — MP4 to MP3 and More

Extracting audio from video is one of the most common media processing tasks: ripping a podcast recorded as a video file, extracting a soundtrack from a film clip, pulling vocals from a music video, or saving an interview recording from a screencast. Our browser-based audio extractor handles all of these using FFmpeg WebAssembly.

When the source video contains an audio codec that matches the desired output format — for example, extracting AAC audio from an MP4 container to an .m4a or .aac file — FFmpeg performs a lossless stream copy. No re-encoding occurs, the audio is simply demuxed from the video container and written to the audio file. This preserves the exact original bitrate, quality, and codec parameters.

For cases where the audio codec doesn't match the output format (e.g., extracting to MP3 from a video with AAC audio), the tool performs a transcode to your specified output format at a configurable bitrate. Supported video input formats include MP4, WebM, MKV, MOV, AVI, and FLV. Audio output formats include MP3, AAC (.m4a), OGG Vorbis, WAV (PCM), and FLAC.

What makes it unique

Lossless Audio Stream Copy for Zero-Quality-Loss Extraction

When the source video's audio codec matches your chosen output format, the extractor uses FFmpeg's stream copy mode (-c:a copy) — the audio bitstream is extracted frame-by-frame without any decoding or re-encoding. This is the highest quality extraction method possible, producing an output file bit-for-bit identical to the audio as it was stored in the video container. Lossless stream copy is supported for AAC→M4A, Opus→WebM audio, and Vorbis→OGG extraction paths.

Common Use Cases for the Audio Extractor

Podcast and Interview Audio Ripping

Extract MP3 or AAC audio from interview videos, webinar recordings, or YouTube downloads to create podcast episodes without any video editing software.

Soundtrack and Score Extraction

Pull the audio track from film clips, game trailers, or music videos to use the soundtrack as background music or for audio analysis.

Screen Recording to Audio

Convert screen recordings and tutorial videos to audio-only files suitable for podcast-style consumption, reducing file size by over 90% by dropping the video track.

How to Use

1
Select a Video File
Drag and drop or choose a video file (MP4, WebM, MKV, MOV, AVI, or FLV). The file loads into browser memory — it is never uploaded to any server, regardless of file size.
2
Choose Output Audio Format
Select your desired audio output format: MP3, AAC (.m4a), OGG Vorbis, WAV, or FLAC. If the source audio codec matches your output, stream copy mode is used automatically.
3
Extract and Download
Click Extract Audio. FFmpeg WASM demuxes the audio track from the video container (or transcodes if necessary) and produces an audio-only output file for immediate download.

Features

Lossless Stream Copy Mode
When codec formats match, audio is extracted via stream copy — no decoding or re-encoding — preserving the exact original quality, bitrate, and codec parameters.
Wide Video Format Support
Accepts MP4, WebM, MKV, MOV, AVI, and FLV video input. Outputs MP3, AAC, OGG, WAV, or FLAC audio, covering all common podcast and production formats.
Multi-Track Audio Selection
For videos with multiple audio tracks (e.g., director's commentary or dubbed languages), select which audio stream to extract before processing.
No Upload, Total Privacy
FFmpeg WASM processes your video entirely in the browser. Video files of any size are handled locally — no data ever leaves your device.

Frequently Asked Questions

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