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Drop one 3GP or two hundred. Batch conversion is not a paid feature here.
Convert 3GP to MP4
Video recovered from an old phone, an SD card or an MMS archive is a .3gp file that nothing current will play.
Runs on your deviceFreeNo sign-upBatch supported
Where the streams already fit the target container this is a lossless remux, which is close to instant. Otherwise it re-encodes, which in a browser is slow — keep it under a few hundred MB and send long videos to the cloud engine.
Waiting for files/Engine: on-device/Network requests made: 0
What actually changes
3GP and MP4 are not the same picture in two wrappers.
The container is an early cut-down MP4 variant, so the H.263 or MPEG-4 video and AMR audio inside are re-encoded to H.264 and AAC in a standard MP4.
Worth knowing first
3GP was built for 2000s mobile networks, so the source is often 176 by 144 with 8 kHz AMR speech audio. The conversion makes it playable, and nothing can make it look or sound like modern footage. Do not upscale it.
Questions
3GP to MP4, answered
Can the quality be improved?
No. The detail was never captured. Any upscaling just enlarges the blur.
Why does the audio sound like a phone call?
AMR is a narrowband speech codec designed for exactly that. The frequency range above about 4 kHz was never recorded.
How to convert 3GP to MP4
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Choose your settings
MPEG-4 Video is lossy, so the quality control decides the trade between size and fidelity.
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Download
Instant, because the file never went anywhere. Nothing expires, since nothing was stored.