3GP
3GP video
3GP is a slimmed-down relative of MP4 designed for 3G-era mobile phones, with low resolutions and small files. Old phone videos and MMS clips are usually 3GP.
Opens in Most phones and VLC; desktop players vary
3GP converter3GP to MKV converter, without the upload.
Turn 3GP videos into MKV. It is converted in your browser, so the file never leaves your device.
Drop 3GP files here
or choose from your computer paste with Ctrl V
from Photos or Files
Ready · other file types work too0 bytes uploaded, ever
Convert to
- On your device · nothing is uploaded
- No account, no email
- Batch and ZIP download
- Free
How to convert 3GP to MKV
Add your 3GP videos
Drop 3GP files onto the box above, or click it to choose them. ToAny reads the file's contents to detect the type, so a wrong extension does not matter.
MKV is already chosen
Press Convert. Open Options first if you want to change the defaults. The work happens in this tab and can take a while for large files.
Download
Save the MKV, or download everything as one ZIP if you converted several files.
Why ToAny
Private by construction
The 3GP to MKV converter is part of this page and runs inside your browser. Your videos are never sent to ToAny or to anyone else.
No upload, no queue
Nothing has to travel to a server and back, so work starts the moment you press Convert. How long it takes depends on your device and the size of the file.
Free, without an account
No sign-up, no email address and no watermark. Add several files and download them together as a ZIP.
3GP to MKV: what to expect
3GP video is low resolution and does not open in many desktop apps. MKV can carry several audio and subtitle tracks in one file. 3GP is at home in video from older mobile phones; MKV is the usual choice for films with several audio and subtitle tracks.
The defaults suit most files. Under Options you can lower the resolution, trade quality against file size, remove the sound and trim the start and end. This is demanding work for a browser: a long or high-resolution file can take several minutes, and your device does all of it, so keep the tab open.
The conversion uses your browser's own video and audio codecs (WebCodecs), with hardware acceleration where the device has it; the file is read from disk as it goes and can be up to 2 GB. Where the browser lacks a codec, the page falls back to the compatibility engine. A video over 500 MB cannot be kept at full quality in browser memory; choosing a lower resolution or quality under Options lets it fit.
3GP vs MKV
MKV
Matroska video
MKV is an open container that can hold practically any video and audio format plus multiple subtitle tracks. That flexibility is why it is popular for films, and why Apple devices and browsers refuse it.
Opens in VLC, Plex and many TVs; not iPhones, QuickTime or most browsers
MKV converter| 3GP3GP video | MKVMatroska video | |
|---|---|---|
| Stands for | 3GPP multimedia file | Matroska |
| Type | Video container | Video container |
| Compression | Lossy | Depends on what is inside |
| Usually contains | H.263 or H.264 video with AMR or AAC audio | Almost anything: H.264, HEVC, AV1, several audio and subtitle tracks |
| Introduced | The early 2000s, by the 3rd Generation Partnership Project | 2002, by the Matroska project |
| Opens in | Most phones and VLC; desktop players vary | VLC, Plex and many TVs; not iPhones, QuickTime or most browsers |
| Best for | Video from older mobile phones | Films with several audio and subtitle tracks |
| File extension | .3gp, .3g2 | .mkv |
Questions
Are my videos uploaded anywhere?
No. The 3GP to MKV conversion runs inside your browser, on your own phone or computer. The file is not sent to ToAny or to anyone else.
Does converting 3GP to MKV reduce quality?
It depends on what is inside the 3GP. When its video and audio are already in a form MKV can hold, they can be carried over without being compressed again. Otherwise they are re-encoded, which costs a little quality. Under Options you can favour quality or a smaller file.
Can I convert several 3GP files at once?
Yes. Add as many as you like, convert them together and download each result or all of them as one ZIP.
How do I convert 3GP to MKV on Windows, Mac, iPhone or Android?
The steps are the same everywhere because ToAny runs in the web browser: open this page in a current version of Chrome, Edge, Safari or Firefox, add the 3GP file, press Convert and save the MKV. There is nothing to install.
Is there a file size limit?
Yes. Files up to 2 GB are accepted, and a video over 500 MB needs a lower resolution or quality chosen under Options so the result fits in memory. Beyond that the limit is your device's memory, since nothing is uploaded; a computer copes with large files better than a phone.