Free MP4 to MP3 Converter Online

Extract MP3 audio from MP4 videos online with MP3 selected by default. Free, fast, no signup, and files up to 1GB supported.

Or drop files here. Max file size 1GB.

Choose a file before converting.

Input format

MP4

The MPEG-4 Part 14 format, better known as MP4, is a multimedia container used to store digital audio and video. It can store other kinds of data, like still images and subtitles.

Output format

MP3

MP3 is a format standard for digital audio that uses lossy compression developed by the Fraunhofer Society. Its official name is MPEG-1 Audio Layer III or MPEG-2 Audio Layer III.

How to convert MP4 to MP3 online

Use this MP4 to MP3 converter when you need the soundtrack, voice, music, lecture, podcast, or screen-recording audio from an MP4 video file.

MP3 is widely supported on phones, browsers, car stereos, media players, editing tools, and podcast workflows, making it a practical output when video playback is not needed.

The converter runs in your browser workflow: upload the video, choose audio settings when needed, and download the finished MP3 without creating an account.

  1. 1 Upload the MP4 video you want to convert.
  2. 2 Confirm that MP3 is selected as the output format.
  3. 3 Open audio settings if you want to change bitrate, quality, sample rate, or volume.
  4. 4 Click Convert to extract MP3 audio from the MP4 file.
  5. 5 Download the MP3 file when conversion is complete.

For speech, 128 kbps usually keeps the MP3 small and clear. For music, choose 192 kbps or higher when quality matters.

If your source is a different video format, use the audio extractor, try MOV to MP3, or open the video converter; if you already have audio, use the MP3 converter hub for WAV, FLAC, M4A, OGG, AAC, and OPUS inputs.

Why use Convertr for MP4 to MP3?

The page gives users the practical details they need before uploading a video: limits, quality controls, privacy, and playback compatibility.

Extract only the audio you need

Turn MP4 videos into standalone MP3 files for music, podcasts, lectures, interviews, screen recordings, voice notes, and offline listening.

Files up to 1GB

Upload full MP4 videos within the 1GB limit, including long recordings and high-resolution videos. The MP3 output is based on your chosen audio settings, not an artificial downgrade.

No signup or software install

Convert directly in the browser and download the MP3 when processing is complete. There is no account gate, no desktop app, and no watermark.

Adjust MP3 quality

Choose bitrate, quality, sample rate, or volume before converting when you need smaller speech files or cleaner music output.

Works on desktop and mobile

Use the same MP4 to MP3 workflow from a computer, phone, or tablet with a modern browser.

Automatic file deletion

Uploaded and converted files are used for the conversion flow and automatically deleted afterward.

MP4 to MP3 FAQ

How do I convert MP4 to MP3 online?

Upload your MP4 video, keep MP3 selected as the output format, adjust audio settings if needed, then click Convert. When processing finishes, download the extracted MP3 audio file.

Is this MP4 to MP3 converter free?

Yes. Convertr lets you convert MP4 to MP3 online for free with no account, no software install, and no watermark added to the MP3 file.

Can I extract audio from MP4 without losing the video file?

Yes. The converter creates a separate MP3 audio file from the uploaded MP4. Your original video is not changed, and the output download contains only the audio track.

What MP3 bitrate should I choose for MP4 audio?

Use 96 to 128 kbps for voice, lectures, and podcasts. Use 192 kbps for everyday music, or 256 to 320 kbps when you want cleaner MP3 audio for offline listening.

Can I convert large MP4 videos to MP3?

Yes. Upload MP4 files up to 1GB and extract the audio as MP3. The conversion starts after upload on a compatible worker, so long videos can still be processed within the upload limit.

Does converting MP4 to MP3 reduce audio quality?

MP3 is a compressed audio format, so the result can be smaller than the original track. Choose a higher bitrate before converting when music quality matters more than file size.

Can I convert MP4 to MP3 on my phone?

Yes. The MP4 to MP3 converter works in modern mobile browsers, so you can upload a video from your phone and download the MP3 without installing an app.

Are uploaded MP4 files secure?

Files are processed for the conversion workflow and automatically deleted after conversion. Use the tool for personal videos, recordings, lectures, and screen captures you need as MP3 audio.

Related MP3 and video audio converters

Need audio from another video format or an MP3 from an audio file? These nearby converters help users continue without going back to the homepage.

MP3 Converter Extract Audio From Video MOV to MP3 MP4 to WAV WAV to MP3 M4A to MP3 FLAC to MP3 OGG to MP3 Audio Converter

What happens when MP4 becomes MP3

Source format

MP4 is a widely supported media container, commonly carrying H.264 or H.265 video and AAC audio.

Target format

MP3 is a widely supported lossy audio format.

What changes

The audio stream is decoded from the MP4 container and encoded as MP3 audio.

The video track, frames, subtitles, chapters, and visual metadata are not included in the audio output.

What is preserved
Audio duration and channel layout are preserved when the source stream and target codec support them.
What may be lost
All visual content is intentionally discarded.
Codec and quality implications
MP3 uses lossy compression. A higher quality or bitrate can reduce new artifacts, but it cannot restore detail already missing from the MP4 source.
Realistic limitations
A MP4 file with no decodable audio stream cannot produce MP3 audio. Corrupt, encrypted, or unsupported codecs can also fail.

Conversion steps

  1. Upload a MP4 file no larger than 1 GB.
  2. Confirm that MP3 is selected as the target.
  3. Start the conversion. A healthy compatible worker begins processing immediately.
  4. Download the MP3 file and check the result before deleting your source.

Troubleshooting

The MP4 file is rejected or will not open.
Confirm that the file is not empty, password-protected, or corrupt and that its real format matches the extension.
The MP3 file is larger than expected.
Choose a more efficient codec or lower quality setting when available. Lossless and uncompressed targets are often larger by design.
The result has no sound or will not play.
Try a broadly supported target codec and verify that the source contains a decodable audio stream.

Privacy and file retention

Uploads and converted files are processed automatically and irreversibly deleted within 24 hours. You can delete them sooner with the delete control. Convertr does not read, mine, sell, or manually review file contents.

Read the privacy policy

Useful alternatives

MP4 to AAC Use this when AAC better matches the app, codec, or editing workflow you need. MP4 to AIFF Use this when AIFF better matches the app, codec, or editing workflow you need.