How to use the 3GP to MP4 converter
- Choose your 3GP video or drop it on the box.
- Check the settings. "Same as original" resolution is fastest and lets fast mode copy compatible videos without re-encoding. Lower it to 720p for a smaller file.
- Click "Convert to MP4". A progress meter shows how far along it is.
- Download your MP4.
Why convert 3GP to MP4?
3GP videos from old phones often play without sound on modern devices because of AMR audio. MP4 fixes that and works on every phone and computer.
- 3GP: low quality by design.
- MP4: plays almost everywhere.
- MP4: good quality at small sizes with H.264.
H.264 video is copied as-is when possible; AMR sound is converted to AAC.
3GP vs MP4
| 3GP | MP4 | |
|---|---|---|
| Full name | 3GPP multimedia file | MPEG-4 Part 14 |
| Type | Video | Video |
| Created by | the 3rd Generation Partnership Project (3GPP) (2003) | Moving Picture Experts Group (MPEG) (2001) |
| Compression | Lossy | Lossy |
| Typical codecs | H.263 or H.264 + AMR or AAC | H.264 + AAC |
| Best for | Old phone videos and very low-bandwidth video | Sharing videos online, phone recordings, social media uploads and streaming |
| Plays on | VLC, most Android phones and QuickTime; many modern apps and websites reject it | Windows, macOS, iPhone, Android, smart TVs, game consoles and every modern browser |
Does converting 3GP to MP4 lose quality?
Often none. When the 3GP contains H.264 video, MP4 can hold it as it is, so fast mode copies the streams without re-encoding. Other codecs (including HEVC while "Play everywhere" is ticked) are re-encoded at "Balanced" quality, which looks the same as the original to most people.
How long does it take?
Re-encoding video uses your device's processor. A short clip takes seconds; a 10-minute 1080p video can take several minutes. Choosing 720p makes it 2–3 times faster.
What is a 3GP file?
3GP is a mobile video format designed for 3G phones. It keeps files tiny with low resolutions and narrow audio. Old feature phones and early smartphones recorded video as 3GP.
What is an MP4 file?
MP4 is a container that usually holds H.264 or H.265 video with AAC sound. It is built on Apple's QuickTime file structure and became an ISO standard in 2001. Because almost every phone, browser, TV and editing app can play it, MP4 is the safest choice when you need a video to just work.
Frequently asked questions
How much does the 3GP to MP4 converter cost?
Nothing. It is free with no registration, no watermark and no limit on how many files you convert.
Is my file uploaded to a server?
No. The converter runs inside your browser using WebAssembly, so your file is processed on your own device and never sent to us or anyone else.
Will the MP4 sound and look as good as the 3GP?
Often none. When the 3GP contains H.264 video, MP4 can hold it as it is, so fast mode copies the streams without re-encoding.
Can I convert MP4 back to 3GP?
Yes, use the MP4 to 3GP converter.
An old 3GP from a phone plays without sound. What should I do?
The sound is probably AMR. Convert it to MP4 and the audio becomes AAC.
Does it work on iPhone and Android?
Yes, in Safari, Chrome and other modern mobile browsers. Short files work best on phones; for long or high-resolution videos a computer is faster.