Convert MP3 to MP4 online, free
Audio vers vidéo fond noir — processed on our secure servers in France. Files deleted after conversion, no sign-up.
Drop your MP3 file here
or click to choose a file — conversion to MP4
MP3 vs MP4 — technical comparison
Frequently asked questions
How to convert MP3 to MP4?+
Drop your MP3 file in the zone above, or click to select it. The MP4 conversion starts automatically on our secure servers — no software to install.
Is converting MP3 to MP4 secure?+
Yes. ConvertLab processes your files on secure servers located in France, over an encrypted connection. They are never shared with any third party and are deleted immediately after the conversion.
Is there quality loss when converting MP3 to MP4?+
Quality depends on the conversion settings. ConvertLab lets you adjust quality before starting.
What is the maximum file size?+
Since the conversion runs on our servers, the limit no longer depends on your device. Files up to 100 MB are accepted. With NoLimit, up to 1 GB per file (250 MB for video).