How to use the MP3 to MP4 converter
- Choose your MP3.
- Add a cover image (optional). Without one, a solid background is used.
- Choose the video size: 1280×720 for YouTube, square for Instagram, vertical for Reels and TikTok.
- Click Make video and download the MP4.
Why turn audio into video?
YouTube, Instagram, TikTok and Facebook only accept video. A still image with your audio is the simplest way to share a song, podcast episode or speech there. The converter uses a very low frame rate for still images, so the MP4 is barely bigger than the MP3.
Image tips
- Use a JPG or PNG at least as large as the video size you pick.
- The image is fitted inside the frame with black bars if its shape is different.
- For square posts, a square album cover looks best.
Good to know
The video uses H.264 at 2 frames per second, which is all a still picture needs, with AAC audio at 192 kbps. The result is barely larger than the audio file and plays on every platform. The video ends exactly when the audio ends.
Frequently asked questions
How long can the audio be?
Any length up to the 1 GB file limit. Long podcasts convert quickly because the picture does not change.
Can I use this for copyrighted songs?
Only upload music you have the rights to share. Platforms detect copyrighted music automatically.
How much does the MP3 to MP4 Converter cost?
Nothing. It is free with no registration, no watermark and no limit on how many files you convert.
Is my file uploaded to a server?
No. The converter runs inside your browser using WebAssembly, so your file is processed on your own device and never sent to us or anyone else.
Does it work on iPhone and Android?
Yes, in Safari, Chrome and other modern mobile browsers. Short files work best on phones; for long or high-resolution videos a computer is faster.