Free Online 3GP to MP4 Converter
Convert 3GP to MP4 on your device. Keep the original picture size or choose a smaller frame, then download the video with its readable soundtrack.
Drop your 3GP video here
or choose a local file or import from a URL
Choose a file to get started
How to convert 3GP to MP4
Select the video file
Choose one .3gp file or drop it into the converter. The extension can be uppercase. For a recording inside a phone backup, first extract the actual media file. The file picker expects the recording itself.
Set the output height
Leave Resolution on Original to keep the size of a small phone video. The numbered options set a maximum height. Check the dimensions in the source player if you are deciding between Original and a smaller copy.
Convert and save
Select Convert 3GP to MP4. When processing finishes, preview the result and use Download file to save it. The original and new sizes appear next to each other, so you can compare them before closing the tab.
Which old phone files can I convert from 3GP to MP4?
What the .3gp extension tells you
A 3GP file is a container. It can contain moving pictures and sound, silent video, or audio alone. Open the file information in a player that can read the original. A video track lists frame dimensions. A voice memo may show an audio codec and duration but no video dimensions. To save that memo as a listening file, select an audio output in the video converter.
How to choose between two copies
When the same recording exists on a memory card and in a message, compare their durations and frame dimensions first. A messaging app can send a shortened or downscaled copy. Use the longer copy if it contains footage missing from the attachment. If their durations match, compare a frame with visible detail. File size by itself cannot identify which copy retained more of the original picture.
A blank source preview
Try the original in a player that reports the tracks it can read. If it shows video and plays through the end, you can still try the 3GP to MP4 export in this tab. The source preview uses the browser’s player and the exporter has a separate decoding path. If the source file has zero bytes, copy it again from the device that holds the recording.
What does a 720p limit do to a 3GP recording?
Both sources below use the same 720p setting. Only the taller recording needs to shrink to fit. The dimensions under each phone show the size of its MP4 frame.
Which details does a 3GP to MP4 export preserve?
Original dimensions and display size
Use the height of the recorded frame to interpret the resolution menu. A 176 × 144 clip already fits below the 480p, 720p and 1080p limits. Selecting any of those values does not add recorded pixels. By contrast, a square-pixel 640 × 480 source limited to 480p keeps its height, while a 1280 × 720 source limited to 480p is scaled down proportionally. The dimensions refer to the output file. The player can still enlarge that picture to fill a window.
The recording’s soundtrack
The MP4 targets H.264 picture and AAC sound when audio is available. A readable silent source can produce a silent video. If you expected sound, play a section with recognizable speech in the standalone source and check whether an audio track is listed. Sound heard only when an editing project is open may be stored in a separate file. This page accepts one source and has no control for mixing in that second recording.
Capture date and location
Keep the phone file when the recording date, location or original encoding matters. The download is a separate file, and the creation date shown by your operating system can be the date of conversion. Check the saved MP4’s media information before relying on it to sort recordings by the day they were filmed.
How to check the picture and sound after conversion
Sideways video or black bars
A sideways picture and black borders require different checks. First open the saved download with the player set to its normal aspect ratio. If the picture is still sideways, use the rotation tool on a copy. If the black area disappears when the window changes shape, it was part of the display. If it appears inside the frame in every player, cropping changes those frame boundaries. The resolution selector scales the frame, including any borders already in the pixels.
If the sound cuts out
Compare the passage in the actual .3gp file and the MP4, with the player unmuted. A silent opening is possible even when later speech is present. Seek into the recording before deciding whether an entire audio track is missing.
3GP to MP4 FAQ and troubleshooting
Does the converter accept .3g2 or .3gpp files?
The 3GP to MP4 file picker accepts the .3gp extension, including uppercase letters. Check the full filename if your file picker hides extensions. Keep the original name of a .3g2 or .3gpp recording and use a converter that explicitly accepts that input.
Why does the MP4 stop before the original recording ends?
Check the duration of the exact .3gp you selected. A message attachment may be shorter than the camera recording. If the copy on the card plays to the end but the transferred file stops early, copy it again and compare the file sizes before another export.
Why can the MP4 be larger than the original?
A 3GP to MP4 export changes the container and can change the encoding bitrate. The phone may have recorded both voice and picture at a very low bitrate. H.264 and AAC can use more bytes for that same running time. If your goal was to open the recording in a different app, check playback first. If you also need a smaller file, compress the working copy to your size limit.
Can I convert 3GP to MP4 without re-encoding?
Compatible streams may be repackaged when their dimensions and codecs already fit the output. An older video codec that needs changing to H.264 must be re-encoded. Original controls the picture dimensions and does not guarantee a byte-for-byte copy of the streams.
Can I import a recording from a shared album?
URL import for 3GP to MP4 conversion needs a direct HTTPS address for the .3gp media and a server that lets your browser read it. If the link opens an album, a sign-in page or a player with a Download button, download the original there and select it from your device.
Can I convert 3GP to MP4 in batches?
Open the batch video converter, add the recordings together and set the common output format to MP4. Each completed file gets its own numbered download. For clips that need different height limits, convert them individually or put each set of clips in a separate batch.