MP3 to MP4
Convert MP3 to MP4 online for free — turn music, podcasts and recordings into a video with a still cover image, ready to upload to YouTube, Instagram, Facebook or LinkedIn. Choose 16:9, square or vertical, and fit the image with a blurred background. Runs privately in your browser.
100% private — everything is processed on your device, never uploaded. Conversion happens on your device; nothing is uploaded.
Everything is processed by your browser’s built-in encoders (WebCodecs) with the open-source Mediabunny library — your files are never uploaded. Works best in recent Chrome, Edge and Safari.
How to convert MP3 to MP4
- Drop your MP3 (or other audio file) in the box.
- Add a cover image, or use a plain background colour.
- Choose the video size and image fit.
- Click Create MP4 and download it.
What you can use it for
- Upload songs and podcasts to YouTube
- Share audio on Instagram, Facebook and LinkedIn as video
- Post voice notes and recordings where only video is accepted
- Archive albums with their cover art
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See all free image tools →Frequently asked questions
How do I put an MP3 on YouTube?
YouTube only accepts video files. Convert your MP3 here with a cover image, then upload the MP4.
Does the audio quality change?
The audio is encoded to AAC at 192 kbps, which sounds great for music and speech.
Why is the file small?
A still image needs very little video data, so almost the whole file is your audio.
Is my video uploaded?
No. The video is read and encoded by your own browser using its built-in video encoders, so it never leaves your device — even large or private videos stay private.