SnapMedia

Free online converter

MP3 to MP4 Converter

Turn an MP3 into an MP4 video with a still image — your cover art or a plain background — so you can upload music or a podcast to YouTube, Instagram or TikTok.

No upload

Converted on your device

No sign-up

Free, no daily limit

No watermark

Your file, untouched

Batch

Several files at once

How to convert MP3 to MP4

  1. Add your MP3 files. Drag them onto the box above or click to choose them. You can add several at once.
  2. Check the target is MP4. It is already selected. Adjust the quality under Options if you want.
  3. Click Convert. The conversion runs in your browser — the file is never uploaded to a server.
  4. Download the MP4. When it finishes, click Download on each file.

When you need this

Publishing a song, a podcast episode or an audiobook chapter on platforms that only accept video.

MP3 vs MP4

MP3

The most widely supported audio format. Lossy compression keeps files small — about 1.4 MB per minute at 192 kbps — while sounding transparent to most listeners.

Best for: music libraries, podcasts, phones, car stereos, anything that just needs to play.

MP4

The universal video format. H.264 video with AAC audio in an MP4 plays on every phone, browser, TV and social network.

Best for: sharing, uploading to YouTube, Instagram or TikTok, and playing anywhere.

Will I lose quality?

The audio is touched as little as possible: if it is already AAC it is copied as-is, otherwise it is encoded to AAC at 192 kbps, which is what YouTube and Instagram recommend. The picture is still, so the video weighs almost the same as the audio.

Related conversions

MP3 to WAVMOV to MP4WEBM to MP4MKV to MP4AVI to MP4All conversions →

Frequently Asked Questions

How do I convert MP3 to MP4?
Drag the MP3 file onto the box above, check the target is MP4 and click Convert. As soon as it finishes a Download button appears. Nothing to install, no account needed.
Is it free to convert MP3 to MP4?
Yes, completely: no sign-up, no daily limit and no watermark. Your own browser does the conversion, so it costs us nothing and there is no reason to charge for it.
Are my files uploaded to a server?
No. The converter runs inside your browser: the file is read and converted on your device and never leaves it. That is why it is safe for private or work recordings.
Will I lose quality?
The audio is touched as little as possible: if it is already AAC it is copied as-is, otherwise it is encoded to AAC at 192 kbps, which is what YouTube and Instagram recommend. The picture is still, so the video weighs almost the same as the audio.
Is there a file size limit?
Up to 1 GB per file. The limit is not a business one but the browser’s: all the work happens in its memory, and above that size some browsers close the tab. On a phone, stay well below it.
Can I convert several files at once?
Yes. Add as many MP3 files as you like and they are converted one after another with a single click. Each one can go to a different format.