Convert 3GP to MKV
3GP is great for old keypad / feature phones and tiny file sizes, but MKV is the better choice for movies with multiple audio tracks and subtitles. Convert 3GP to MKV in seconds, right in your browser.
- No upload — 100% private
- Fast, lossless when possible
- Free & unlimited
- Works on iPhone & Android
Keep this tab open — the conversion runs on your device, nothing is uploaded.
Add more files above to keep converting.
How to convert 3GP to MKV
- 1
Tap Choose files and select one or more 3GP files (or drag them in).
- 2
Check that MKV is selected. Use Advanced options for resolution, size or trimming.
- 3
Press Convert. Everything happens on your device — no upload, no waiting in a queue.
- 4
Your MKV downloads automatically. Converting several files? Grab them all as a ZIP.
3GP vs MKV
Both formats are lossy, so the video is re-encoded once. Pick High quality to keep it as close to the original as possible, or Small for the smallest file.
| 3GP | MKV | |
|---|---|---|
| Full name | 3GPP Mobile Video | Matroska Video |
| Type | Video | Video |
| Compression | Lossy | Lossy |
| Developed by | 3GPP | Matroska.org |
| Introduced | 2003 | 2002 |
| Plays on iPhone | ◐ Partly / with an app | ✕ No |
| Plays on Android | ✓ Yes | ◐ Partly / with an app |
| Plays on Windows | ◐ Partly / with an app | ✓ Yes |
| Plays on Mac | ◐ Partly / with an app | ◐ Partly / with an app |
About 3GP and MKV
3GP: 3GP was designed for mobile phones in the 2000s. It keeps files tiny, which makes it perfect for old keypad phones, feature phones and very slow connections.
MKV: MKV is a flexible open container that can hold unlimited video, audio and subtitle tracks. It is popular for movies and anime but isn't supported by iPhone or most TVs out of the box.
Frequently asked questions
How do I convert 3GP to MKV on my phone?
Will converting 3GP to MKV reduce quality?
Is this 3GP to MKV converter free?
Are my files uploaded to a server?
Rate this tool
Be the first to rate it.
Thanks for rating! ❤️