How is conversion quality ensured?

You can customize both bitrate and sample rate. The tool supports up to 320 kbps for high-quality output. Lossless mode is recommended to preserve original audio quality.

What is the audio quality of the converted MP3 file?

Audio quality depends on the selected bitrate. 128 kbps is standard quality, 320 kbps provides the highest MP3 quality, and lossless mode preserves the original audio quality.

How do I choose the right bitrate?

128 kbps is suitable for everyday use, 192 kbps is ideal for high-quality needs, and 320 kbps offers near CD-quality audio with larger file sizes. 192 kbps is recommended for the best balance.

Should I choose 44,100 Hz or 48,000 Hz?

44,100 Hz is the CD standard and offers the best compatibility. 48,000 Hz is commonly used in professional audio and video production. For most users, 44,100 Hz is recommended.

What should I do if MP4 to MP3 conversion fails?

Please check: (1) whether the file is corrupted, (2) whether the file exceeds the 500 MB limit, (3) whether your browser supports WebAssembly, and (4) your browser console for detailed error messages.

Can I use the MP4 to MP3 tool on mobile devices?

Yes, as long as you use a modern browser such as Chrome or Safari. Due to mobile memory limitations, we recommend converting smaller video files (under 100 MB).

Can I close the browser during conversion?

No. Since the conversion runs in your browser, closing the page or browser will interrupt the process. Please keep the page open until conversion is complete.

Free MP4 to MP3 Converter – Fast & Secure Audio Extraction

Q: Is MP4 to MP3 conversion free?

Yes. This tool provides completely free online MP4 to MP3 conversion with no registration or software download required.

Q: How long does MP4 to MP3 conversion take?

Conversion speed depends on video size and your device performance. It usually takes from a few seconds to a few minutes. A 100 MB video typically takes about 1–3 minutes.

Core Features

Browser-based Conversion

Uses FFmpeg.wasm technology, processes directly in browser without uploading to server, fast conversion speed

Audio Track Extraction

Extract audio tracks from MP4 videos and convert to MP3, perfectly preserving original audio quality

Custom Audio Parameters

Support 128k-320k bitrate and 44.1kHz/48kHz sample rate to meet different audio quality requirements

Privacy Protection

All processing done locally in browser, files not uploaded to any server, protecting your privacy

How to Use

Upload Video File

Click upload button or drag MP4 file directly to the designated area

Supports drag-and-drop upload, convenient operation
Recommended file size under 500MB

Select Audio Parameters

Choose audio bitrate and sample rate as needed, recommend using 192kbps high quality output

128kbps: Standard quality, smaller file size
192kbps: High quality, recommended choice
320kbps: Maximum quality, larger file size

Start Conversion

Click convert button, system will process locally in browser without uploading to server

Real-time conversion progress percentage
Debug console shows detailed logs
Conversion process completed in browser

Save MP3 File

After conversion completion, click save button to download MP3 audio file

Automatic notification after conversion
One-click download MP3 audio file
Directly save to local device

Who Is This For?

Music Extraction

Extract audio from MV, music videos, save as MP3 for mobile playback or music library

Podcast Production

Convert video lectures, interview recordings to MP3 audio, convenient for podcast content creation

Mobile Music Listening

Extract video audio to MP3, save mobile storage space, listen to music anytime anywhere

Car Music

Convert to MP3 format compatible with car audio systems, enjoy high quality music experience

Course Learning

Extract teaching video audio, convenient for learning during commute, exercise, improve learning efficiency

Privacy Protection Conversion

Local conversion processing, files not uploaded to server, protecting privacy while choosing appropriate audio parameters

Frequently Asked Questions

Is MP4 to MP3 conversion free?

How is conversion quality guaranteed?

How long does MP4 to MP3 conversion take?

Which video formats are supported for conversion to MP3?

What is the audio quality of converted MP3 files?

What is the maximum MP4 file size supported for conversion?

Does MP4 to MP3 retain video audio tracks?

Where are converted MP3 files saved?

How to choose appropriate bitrate?

Choose 44100Hz or 48000Hz sample rate?

What to do if MP4 to MP3 conversion fails?

Can I use MP4 to MP3 tool on mobile?

Can batch MP4 to MP3 conversion be implemented?

Can I close browser during conversion?

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