MP4 to MP3 Converter - Extract Audio Locally

Free MP4 to MP3 converter that extracts audio locally in your browser with batch queues, bitrate options, and no video uploads.

Click for theater mode

Drop MP4 videos here

Supports MP4 / M4V. Add multiple files; videos are converted without uploads.

Select MP4 videos to begin.

Video files are processed only in this browser and are not sent to a server.

Conversion Queue

0 videos added

Add MP4 files to see progress and download buttons for each result.

How to Use

  1. Click "Select MP4 Files" or drop one or more MP4 / M4V videos into the upload area.
  2. Choose MP3 quality: 128kbps for smaller files, 192kbps for a balanced result, or 320kbps to preserve more detail.
  3. Click "Convert to MP3". Before the first conversion, the browser loads the FFmpeg WebAssembly engine on demand.
  4. When the queue finishes, click "Download MP3" beside each video.
  5. For large videos or mobile browsers, convert in smaller batches to avoid memory limits.

Core Features

  • Extract audio locally: MP4 files are read, converted, and exported in the current browser, which is safer for private clips, lessons, interviews, and meeting recordings.
  • No video uploads: The conversion does not send your video to EasyTools servers, avoiding slow uploads and reducing privacy exposure.
  • Standard MP3 output: A locally loaded ffmpeg.wasm engine encodes the video audio track into an MP3 file that common players can open.
  • Batch queue conversion: Add multiple MP4 / M4V videos and convert them one by one, with a separate download link for each result.
  • 128/192/320kbps options: Pick standard, balanced, or high-bitrate output depending on whether you care more about file size or clarity.
  • No server upload quota: EasyTools does not set a server-side file size limit; practical limits depend on device memory, CPU, and browser behavior.

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Calculation Logic

EasyTools uses @ffmpeg/ffmpeg with on-demand @ffmpeg/core WebAssembly files to run FFmpeg inside browser memory. The converter writes the MP4 into FFmpeg's in-browser virtual file system, extracts the audio track, encodes it with libmp3lame, and creates a downloadable MP3 Blob URL.

Traditional online MP4 to MP3 tools often upload your video before returning a converted file. This tool does not send video files to EasyTools servers and does not depend on a server-side conversion queue. The FFmpeg WebAssembly core is large, so the first conversion loads the engine before work starts; very large videos are still limited by available device memory, CPU, and browser behavior.

FAQ

Is this MP4 to MP3 converter free?

Yes. The tool is free to use, does not add a daily conversion paywall, and does not require desktop software.

Will my private videos be uploaded?

No. Video files are read and converted locally in your current browser, and the MP3 is downloaded through a local Blob URL.

Is there a maximum file size?

EasyTools does not set a server-side upload limit because videos are not uploaded. Practical limits depend on your current device memory, CPU, browser state, and how many files you process at once.

Does converting MP4 to MP3 lose quality?

Some quality loss is expected. MP3 is a lossy audio format; choosing 320kbps can preserve more detail, but conversion cannot turn low-quality source audio into higher-quality audio.

Can I use this on my phone?

Modern mobile browsers can handle small to medium videos. Large videos are better converted on a desktop browser because WebAssembly transcoding uses significant memory.