Convert 3GP to MP4 Online — No Upload, No Watermark
3GP is the mobile-phone container from the pre-smartphone era — rarely supported today. Converting to MP4 gives you a file that plays on every phone, browser, and editor without re-encoding at playback time.
Drag & drop your video here, or click to browse
Max file size: ~2 GB (memory permitting)
Where 3GP files come from
3GP was the mobile format of the pre-smartphone era, designed to keep video small enough for 3G networks and feature-phone storage. Files come from phones made before roughly 2012, from old MMS messages, and from budget handsets that kept using it much later.
What changes when you convert 3GP to MP4
| Video | H.263 or MPEG-4 Part 2 re-encoded to H.264 |
|---|---|
| Audio | AMR narrowband re-encoded to AAC |
| Resolution | Preserved as recorded, commonly 176x144 or 320x240 |
Worth knowing first
These files are genuinely tiny, often 176x144, because they were made for screens that size. Converting makes them play everywhere but cannot add detail that was never captured, and upscaling only makes the softness larger. Keep the original resolution and let the player scale.
FAQ
Can I make an old 3GP look better?
Not meaningfully. The limit is the recording, which was made at a tiny resolution with a heavily compressed codec on an early phone camera. Converting fixes compatibility. Upscaling enlarges the blur rather than recovering detail.
Why does the audio sound like a phone call?
Because it effectively is. 3GP uses AMR narrowband, the same speech codec as a GSM voice call, which covers roughly 300 Hz to 3.4 kHz. That band is all that was recorded, so the converted AAC preserves the same telephone character.
What about 3G2 files?
3G2 is the CDMA cousin of 3GP, used by Verizon and Sprint handsets of the same era. It behaves the same way and converts identically.
Is this 3GP to MP4 converter really free and without upload?
Yes. The tool runs entirely in your browser using FFmpeg compiled to WebAssembly. Your 3GP file never leaves your device — open the DevTools Network tab to verify zero uploads. No signup and no watermark. The practical size limit is the memory your browser gives this tab, which is generous on a computer and a few hundred megabytes on a phone.