Convert MP3 to MP4
Select Files
Audio, Video and Image supported. Drag or click
Need to convert MP3 to MP4? Our free tool processes everything locally in your browser. No installation, no sign-up, no limits.
How It Works
Add MP3 Files
Use the upload button or simply drop your MP3 files into the page. No size limits during the upload step.
Start the Conversion
Click convert and WeLoveConvert turns each MP3 file into MP4 right in your browser tab.
Grab Your MP4 Files
When processing finishes, every output file is ready for download — single file or zipped batch.
About These Formats
Convert MP3 to MP4 when a platform only accepts video files: uploading a podcast episode or interview to YouTube, posting a song or voice memo where audio attachments are not allowed, or preparing audio for video editors that refuse plain MP3. The result is a standard MP4 with an AAC audio track that every phone, browser and social network plays natively. Technically the MP3 stream is decoded and re-encoded as AAC inside an MP4 container. Expect file size in the same range as the source. Because this is a lossy-to-lossy step, keep the source bitrate healthy: 192 kbps or higher MP3s convert with no audible difference for spoken content and most music. WeLoveConvert does the decode and the AAC encode entirely in your browser through WebAssembly FFmpeg — the audio never leaves your device. Tip: if your target platform also accepts M4A, that is the same AAC audio without the video container, at a slightly smaller size.
Frequently Asked Questions
How do I convert MP3 to MP4?expand_more
Upload your files, confirm the conversion settings, and download your converted files. All processing happens in your browser — no server upload required.
Is this MP3 to MP4 converter free?expand_more
Yes, completely free with no hidden fees. No sign-up required, no usage limits. All conversion happens in your browser.
Is it safe to convert MP3 to MP4 online?expand_more
Your files never leave your device. All conversion happens locally in your browser using WebAssembly technology. We have zero access to your files.
Will I lose quality converting MP3 to MP4?expand_more
Quality depends on the target format and your settings. Lossless formats like PNG preserve original quality. For lossy formats like JPG, you can adjust the quality slider.
Can I convert multiple MP3 files at once?expand_more
Yes, you can convert multiple files at once. Simply drag all your files into the upload area or click to select them.
Common Issues
- infoThe MP4 has no picture — players show a black screen or static artwork, which is expected for audio-only video
- infoSome platforms require an actual video stream; if the upload is rejected, add a static image in a video editor first
- infoLossy-to-lossy transcode: very low bitrate MP3s (64 kbps voice notes) can sound slightly duller after AAC re-encode
- infoID3 tags like cover art may not carry over into the MP4 metadata atoms