Convert 3GP to MP4 Online
Turn 3GP files into MP4 directly in your browser using ConverterUp. There is no upload, no waiting in a queue, and no account required — your files stay on your device while WebAssembly does the work locally. Adjust quality and dimensions where supported, then download the result. The output keeps the visual fidelity you'd expect from a desktop app while running entirely in the browser tab.
Convert 3GP to MP4 nowHow to convert 3GP to MP4
Open the converter
Click the button to open the 3GP to MP4 tool. It loads instantly — no install, no signup.
Drop your 3GP file
Drag your 3GP file into the upload area or click to browse. The file stays in your browser memory only.
Download MP4
The conversion runs locally and finishes in seconds. Click download to save the MP4 file to your device.
3GP vs MP4 at a glance
Key technical differences between the two formats, so you know what to expect before converting.
| Feature | 3GP | MP4 |
|---|---|---|
| Type | Video container | Video container |
| Compression | Lossy | Lossy |
| Audio track | Yes | Yes |
| Common codecs | H.263, H.264, AMR, AAC | H.264, H.265, AV1, AAC |
| Browser support | Partial | All browsers |
| Extensions | .3gp | .mp4 |
| MIME type | video/3gpp | video/mp4 |
| Introduced | 3GPP | 2003 · MPEG (ISO/IEC 14496-14) |
What changes when you convert 3GP to MP4
- 3GP and MP4 are containers. The video and audio streams are re-encoded into codecs that MP4 supports (typically H.264, H.265, AV1), so you get a file that plays reliably rather than a simple rename.
- The audio track is carried over to the MP4 file, re-encoded if needed.
- Compatibility improves: MP4 opens in more browsers, apps and operating systems than 3GP.
About 3GP
3GP is a multimedia container defined by the 3GPP for mobile phones. It stores H.263 or H.264 video with AMR or AAC audio at low bitrates suited to early mobile networks.
- Best for
- Videos recorded on older mobile phones and MMS messages.
- Strengths
- Very small files.
- Limitations
- Low quality, limited modern support and codecs that many apps cannot decode.
About MP4
MP4 (MPEG-4 Part 14) is the most widely supported video container. It typically holds H.264 or H.265 video with AAC audio and plays on virtually every phone, browser, TV and editor.
- Best for
- Sharing videos, uploading to social networks and YouTube, and playback on any device.
- Strengths
- Universal playback, good compression, streaming-friendly.
- Limitations
- Lossy codecs, so repeated re-encoding gradually reduces quality.
Frequently asked questions
Is the 3GP to MP4 conversion really free?
Yes. ConverterUp is fully free, with no signup, no watermarks, and no daily quota for the 3GP to MP4 converter. We support the project through unobtrusive ads.
Are my 3GP files uploaded to a server?
No. Conversion runs in your browser using WebAssembly. The 3GP bytes never leave your device, and we have no upload endpoint at all.
What is the maximum file size?
For 3GP input, the soft cap is 50 MB for images and 500 MB for video. Practical performance depends on your device's RAM.
Will the MP4 file open everywhere?
Yes. MP4 is supported by every modern browser, operating system and most apps, so it is the safe choice for sharing.
Does converting 3GP to MP4 keep the sound?
Yes. The audio track is kept and, if necessary, re-encoded into a codec that MP4 supports.
Related guide
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