MP4 to MP3 Converter – Free Online

Video & Audio Converter

Total Estimated Output Size: 0.00 KB

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How to Convert MP4 to MP3 Online

Upload your MP4 file

Drag and drop your .mp4 file onto the page or click to browse. You can select several MP4 files at once to batch-convert them.

MP3 is preselected

The output format is already set to MP3, so you can convert immediately. If you need to, adjust the audio codec, bitrate or sample rate in the settings panel first.

Convert and download

Click Convert. The MP3 file is processed on your own device; nothing is uploaded to a server. When it finishes, click Download to save it (or Download all to get a batch as a ZIP).

Why Convert MP4 to MP3?

MP4 videos often contain music, lectures, interviews or podcasts you only need to listen to. Converting MP4 to MP3 drops the video stream entirely, leaving a small audio file you can play on any phone, car stereo or music app without wasting storage or battery on pixels you never watch.

MediaConverter.io decodes the MP4's AAC audio and re-encodes it to MP3 directly in your browser using WebAssembly. Your video never leaves your computer, and you can adjust the MP3 bitrate before converting to trade file size against quality.

Private by design: your MP4 file is converted on your own device and never uploaded.
MP3 preselected: the output format is already chosen, so it is a one-click conversion.
Batch friendly: convert several MP4 files in one go and download them as a ZIP.
No limits, no watermark: free for files of any size, with nothing stamped on the output.

MP4 vs MP3

MP4 (MPEG-4 Part 14): MP4 is the most widely supported video container in the world. It usually carries H.264 or H.265 video with AAC audio, plays on every phone, browser, TV and editing app, and is the safest choice for sharing. It is best for sharing, social media, web playback and mobile devices.

MP3 (MPEG-1 Audio Layer III): MP3 is the universal lossy audio format. It plays on every device made in the last twenty-five years and offers small files with good quality at 192 to 320 kbps. It is best for music players, podcasts, phones and sharing.

In short: keep MP4 when the priority is sharing, social media, web playback and mobile devices, and switch to MP3 when the file is headed for music players, podcasts, phones and sharing. Need a different target? The full Video Converter supports every format listed below.

MP4 to MP3 FAQ

Does converting MP4 to MP3 reduce audio quality?

Slightly, because both AAC (inside MP4) and MP3 are lossy codecs, so the audio is decoded and re-encoded. At 192 kbps or higher the difference is inaudible to almost everyone. Leave the bitrate slider at 100% to keep the original bitrate.

Can I convert only part of an MP4 to MP3?

Convert the whole file here, then use our free Video Cut-Trim tool to keep just the section you want. Alternatively trim the MP4 first and convert the trimmed clip.

Can I convert several MP4 files to MP3 at once?

Yes. Drop multiple MP4 files onto the upload area and they will be converted one after another and offered as a single ZIP download.

Is this MP4 to MP3 converter free?

Yes. Converting MP4 to MP3 on MediaConverter.io is completely free, with no watermark, no sign-up and no daily conversion limit.

Are my MP4 files uploaded to a server?

No. The converter runs inside your browser using WebAssembly and WebCodecs, so your .mp4 file is read and converted on your own device. Nothing is uploaded, which keeps private recordings private and means there is no waiting in an upload queue.

Is there a file size limit for MP4 to MP3?

No fixed limit. Because processing happens locally, the practical limit is your computer's memory and patience; multi-gigabyte MP4 files convert fine on a desktop browser. Very large files take longer on phones.

Which browsers support the MP4 to MP3 converter?

Current versions of Chrome, Edge, Firefox and Safari on desktop all work. Chrome and Edge are fastest because they expose hardware-accelerated WebCodecs decoders.