Converters

MP4 to MP3 Converter

Convert MP4 video to MP3 audio online for free. Extract audio from MP4 files. Fast video to audio converter.

Use MP4 to MP3 Converter to get instant results without uploads or sign-ups. Everything runs securely in your browser for fast, reliable output.

Your results will appear here.

Ready to run.

About this tool

Our MP4 to MP3 Converter Calculator helps you estimate the file size and specifications when converting video files to audio format.

Converting MP4 to MP3 extracts only the audio track, removing video data and significantly reducing file size. Perfect for music videos, lectures, and podcasts.

Audio extraction is fast and maintains the original audio quality (up to the selected bitrate limit).

Usage examples

Music Video Conversion

Extract audio from 5-minute music video

Input: 5-minute MP4 (50 MB) → Output: 9.6 MB MP3 (320 kbps)

Lecture Recording

Convert 1-hour lecture video to audio

Input: 60-minute MP4 (500 MB) → Output: 86 MB MP3 (192 kbps)

How to use

  1. Enter your MP4 video file specifications
  2. Select desired audio quality and bitrate
  3. Choose output format (MP3, M4A, etc.)
  4. View estimated output file size

Benefits

  • Extract audio from video files
  • Significantly reduce file size
  • Listen without video playback
  • Save storage space
  • Multiple audio quality options
  • Fast conversion process
  • Compatible with all media players

FAQs

Will I lose audio quality?

If the original video has high-quality audio and you select 320 kbps MP3, quality loss is minimal. Lower bitrates will reduce quality.

How much smaller is MP3 compared to MP4?

MP3 files are typically 80-95% smaller than the original MP4 video, as they contain only audio data without video.

What audio quality should I choose?

320 kbps for music, 192 kbps for general use, 128 kbps for speech/podcasts. Higher bitrate = better quality but larger file.

Can I convert YouTube videos to MP3?

Technically possible but check terms of service. YouTube's TOS prohibits downloading without permission. Legal alternatives: YouTube Music Premium (offline listening), purchase music from iTunes/Amazon, use royalty-free music sites. For your own uploaded videos, you own rights and can freely convert.

What's the difference between MP3 and M4A?

M4A (AAC codec) offers better quality than MP3 at same bitrate - 128kbps M4A ≈ 160kbps MP3 quality. M4A is Apple's preferred format (iTunes, iPhone). MP3 is more universal (plays on everything). For music: M4A is better. For maximum compatibility: MP3. Most modern devices support both.

How long does conversion take?

Extracting audio is fast - typically 0.1-0.3x realtime. A 5-minute video converts in 60-90 seconds. Factors affecting speed: video file size, your CPU, output bitrate (higher = slower), batch conversion. Much faster than video encoding because only audio processing is needed, no video rendering.

Related tools

View all tools
Audio TrimmerImage to Text Converter (OCR)Roman Numeral Converter

Audio Trimmer

Trim audio files online for free. Cut MP3, WAV, and other audio formats. Easy audio cutter and editor.

Converters

Image to Text Converter (OCR)

Extract text from images online with OCR. Free image to text converter. Convert JPG, PNG to editable text instantly.

Converters

Roman Numeral Converter

Convert Arabic numbers (1, 5, 10) to Roman Numerals (I, V, X) and vice versa instantly. Supports standard notation up to 3,999.

Converters