MP4 to MP3 Converter
Converts MP4 files to MP3 format — universal video playback on any device to universal music playback and sharing across all devices and platforms. All conversion happens locally in your browser with no file size limits.
Runs on FFmpeg
How to Use the MP4 to MP3 Converter
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Extract the audio track from QuickTime MOV files and convert it to MP3 format. All processing runs locally in your browser with FFmpeg WASM — nothing is uploaded.
WebM to MP3 Converter
Extract the audio track from WebM video files and convert it to MP3 format. All processing runs locally in your browser with FFmpeg WASM — nothing is uploaded.
MKV to MP4
Convert MKV video files to MP4 format directly in your browser. 100% free, private — your files never leave your device.
Video to MP3 Converter
Extracts the audio track from uploaded video files (MP4, MOV, AVI, WebM) and encodes it as a high-quality MP3 file. Free to start with no signup.
Video Compressor
Reduces MP4, MOV, and WebM video file sizes with a configurable CRF 20–40 slider (default 28, libx264 fast preset), plus a GIF mode with color-palette control. Videos never leave your device — compression runs locally in your browser with FFmpeg WASM.
Frequently Asked Questions
Why convert MP4 to MP3?
MP4 (MPEG-4 Part 14) uses lossy compressed encoding and is best for universal video playback on any device — phones, smart TVs, web browsers, and social media. MP3 (MPEG-1 Audio Layer 3) uses lossy compressed encoding and excels at universal music playback and sharing across all devices and platforms. Converting between them lets you take advantage of each format's strengths — for example, using a compressed format for sharing and a lossless format for editing. All conversion happens locally in your browser with no file size limits.
What does MP4 to MP3 Converter do?
Extracts the audio track from MP4 video files and saves it as a standalone MP3 file. All processing runs locally in your browser with FFmpeg WASM — nothing is uploaded.
Where does MP3 fit best?
universal music playback and sharing across all devices and platforms.
When using MP4 to MP3 Converter, what MP4 files convert best?
Complete, uncorrupted MP4 files convert cleanly. Partial downloads and truncated files fail or produce broken output — verify the source opens correctly first.
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Last updated October 2026