Convert MP3 to MP4
Drop your MP3 and get MP4 back in seconds. Our AI handles the conversion — no settings, no software, nothing to learn.
Talk to your files
Anything that used to take five menus and three export dialogs is now one sentence in the chat. Watch it work:
Built for how you actually work
One assistant instead of a dozen single-purpose converter sites.
Every format in one place
Images, documents, video, audio and data — 50+ formats handled by one chat, with a dedicated page for every conversion.
Private by design
Your files are used to run your conversion and nothing else. No sharing, no training, and everything auto-deletes within 24 hours.
Seconds, not minutes
Most conversions come back before you'd have found the right export menu.
Speaks your language
The whole product — pages, assistant and answers — works in seven languages.
Nothing to install
Runs entirely in your browser, on any device. No apps, no accounts to start, no updates.
MP3 vs MP4 at a glance
| MP3 | MP4 | |
|---|---|---|
| Type | Audio | Video |
| File extension | .mp3 | .mp4 |
| Compression | Lossy | Depends on codec |
| Support | Opens everywhere | Opens everywhere |
| Best for | Music and audio everywhere | Sharing and publishing video |
What is a MP3 file?
MP3 made digital music mainstream and remains the most compatible audio format in existence. Its lossy compression shrinks audio to roughly a tenth of its original size while keeping quality most listeners can't tell apart from the source.
What is a MP4 file?
MP4 (usually with H.264 video and AAC audio inside) is the universal video format: every phone, browser, TV and editing app plays it. It balances quality and size well, which makes it the safe choice for sharing, embedding and uploading.
Why convert MP3 to MP4?
MP3 is already compressed, so it's mostly converted when an editor, sampler or system demands raw WAV audio. MP4 with H.264 plays on virtually every device and platform, making it the default for sharing and uploading video.
Turning MP3 into MP4, in practice
What you actually get
An MP4 video file containing your audio over a plain black background. The audio is encoded at 192 kbps AAC — effectively indistinguishable from the MP3 source.
That's exactly what platforms that refuse bare audio files want: a valid video with a real video track, ready to upload.
Why people need this
YouTube, Instagram, WhatsApp status and most social platforms accept video, not audio. Converting a podcast episode, a mix, or a recording to MP4 is the standard workaround — upload the video, and listeners hit play like any other clip.
Add a cover image
Want more than a black screen? Attach an image along with your audio and ask to use it as the cover — it becomes a still background for the whole video (album art, a photo, a title card). The image is scaled to fit 1280×720 and centred, so any shape works. Without an image, you get the plain black background, which is all some uploads need.
Limits
Guest uploads run to a generous per-file size — several hours of audio — with 10 conversions a day. A free account raises the file size and daily count further.
MP3 to MP4, answered
Common questions about converting MP3 to MP4.
Drop your MP3 into the chat and ask to convert it to MP4. The assistant runs the conversion and gives you a MP4 to download — usually in a second or two.
Yes. You can convert MP3 to MP4 for free as a guest. Signing in raises your limits and lets you convert more files per day.
No. Everything runs in your browser — there's nothing to download or set up. Just drop your MP3 and go.
Your MP3 is only used to run the conversion you asked for. We don't share it or use it for anything else, and it's automatically deleted from our servers within 24 hours.
YouTube only accepts video. Convert the MP3 to MP4 here (the audio gets a black video track), then upload the MP4 normally and set a custom thumbnail if you want something nicer than black.
The audio is re-encoded to 192 kbps AAC, which is audibly identical to typical MP3 sources. Your original file isn't modified.
Yes — attach an image with your audio and ask to use it as the cover. It becomes a still background for the whole clip (great for album art or a title card). Attach nothing and you get a plain black background.