Processed on your device

MP4 to MP3 Converter

Yes. You can convert MP4 videos to MP3 audio files in your browser without uploading your files. Using client-side Web Audio decoding and pure JavaScript LAME encoding, conversion runs securely on your device.

Browse files or drag & drop

Files never leave your browser. Zero cloud uploads.

Supports MP4, M4V, MOV, or WebM video (up to 1 GB)

Your files are processed in your browser and are not uploaded by our code. You can confirm this in your browser's Network tab. Third-party ad scripts load on the page, outside the tool area, and are not given your files.

How does it work locally?

Drop Your MP4 File

Select an MP4 video from your computer or phone. The file is held strictly in local browser memory.

Configure MP3 Bitrate

Select your preferred audio quality: 128 kbps for compact files, or 192, 256, and 320 kbps for high fidelity.

Encode & Download MP3

Our standalone client-side encoder converts the audio track into an MP3 file ready for instant download.

Tips for Best Results

For music recordings, choose 192 kbps or 320 kbps for clean acoustic highs.
For lectures, interviews, and audiobooks, 128 kbps provides smaller file sizes with excellent vocal clarity.
Both mono and stereo tracks are supported and preserved accurately.
Verify zero uploads by checking the Developer Tools Network tab during conversion.

Format Comparison

Bitrate Setting	File Size per Minute	Acoustic Fidelity	Recommended For
128 kbps	~0.9 MB	Good (Standard voice)	Podcasts, speeches, audiobooks
192 kbps	~1.4 MB	Very High (Transparent)	Everyday music, balanced quality
256 kbps	~1.9 MB	Near Master	High-fidelity acoustic tracks
320 kbps	~2.4 MB	Maximum MP3 Limit	Studio masters and audiophile playback

Limits and Technical Specifications

Maximum MP4 file size: 1 GB.
Direct stream copy is not applicable for MP3 output; audio is decoded and re-encoded using LAME.
Files containing DRM encryption or password protections cannot be processed.