FormatOwlHow to Convert 3GP Video to MP4
Older phone recordings often use a 3GP container. FormatOwl reads the video and creates a new H.264 MP4 file; renaming the extension alone does not convert it.
Open the 3GP to MP4 converterConvert the file
Open the 3GP to MP4 converter and select a .3gp video. The page accepts up to 1 GiB per file. An unreadable video track or damaged file will be rejected.
Leave MP4 and H.264 selected for the broadest playback compatibility. Start processing, then compare the preview with your original before downloading.
A measured test file
In a local processor test on September 23, 2026, a synthetic one-second 176 × 144 video with H.263 video and AAC audio occupied 72,755 bytes as 3GP. The H.264 MP4 output occupied 35,872 bytes and retained the one-second duration and 176 × 144 dimensions.
That size change belongs only to this generated test clip. A different recording may become larger, and conversion cannot restore lost detail.
Check the MP4
Play the beginning and end, listen for audio, and check orientation and important details. Keep the source 3GP file until the MP4 works in the app where you need it.