Does this upload my video?

No - extraction runs in your browser only.

Which video formats are supported?

Files that your browser can decode, commonly MP4 with AAC audio.

Can I convert to MP3?

This tool exports WAV; MP3 export requires additional encoding which can be added client-side but is not included by default.

Is quality preserved?

The audio track is preserved as decoded by your browser; exported WAV keeps the PCM audio data.

Yes - entirely client-side and free to use.

Extract Audio from Video Online - Get MP3 from MP4 Instantly

Extract audio from video files directly in your browser. Convert MP4 video to WAV without uploading your file to any server. Processing is done locally using the browser's decoding capabilities.

If you want to edit the extracted output right away, use audio cutter for quick trims.
Use Trim MP3 Online for additional waveform editing.
For level balancing after extraction, apply adjust audio loudness.

Upload Audio

Drop audio file here or click to upload

MP3, WAV, M4A, AAC, FLAC, OGG

Max file size: 200MB Files processed locally in your browser

How it works

The browser reads the file as an ArrayBuffer and attempts to decode the audio track via the Web Audio API's decodeAudioData. For common containers like MP4 with AAC audio, modern browsers can decode the audio track directly. Once decoded into an AudioBuffer, it is exported as WAV and offered for download - all in memory in the browser.

Choose your fileSelect the video file that contains the audio you want to extract.
Decode the audio trackThe browser reads and decodes the embedded audio locally in memory.
Download the WAVExport the decoded audio as a WAV file and save it to your device.

FAQ

Will my file be uploaded?

No - the file stays in your browser.

Can I get MP3 directly?

This tool provides WAV output; MP3 encoding can be added client-side using a JS encoder if desired.

What if decodeAudioData fails?

Your browser may not support the audio codec inside the video; try exporting from your video editor to a supported container or use a different browser.

Are there size limits?

Browser memory sets practical limits; smaller files are more reliable.

Is the audio quality preserved?

Yes - audio is exported as decoded PCM in WAV format.

Internal Links

Extract Audio from MP4 Video Online

This free online tool lets you extract audio from MP4 video files directly in your browser. You can also use our MP3 trimmer tool to cut and edit the extracted audio after conversion. No uploads, no server processing, and no account required.

Supported Video Formats

Most modern browsers support audio extraction from MP4 (H.264 + AAC). Support depends on your browser's built-in media decoder.

How It Works

Select your video file (MP4 recommended).
The browser decodes the audio track locally.
The extracted audio is converted to WAV format.
Download your audio file instantly.

Privacy First

Unlike many online converters, FreeAudioTrim processes everything locally using the Web Audio API. Your files are never uploaded to any server.

Guides for Extraction and Cleanup

Extract audio from video guide for codec, container, and troubleshooting tips.
How to edit audio online for the next cleanup steps after extraction.
How to trim MP3 online when the extracted track needs a quick structural edit.