Convert 3GP to MKV
Convert 3GP files to MKV locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
Upload FilesPlatform Statistics
How to convert 3GP to MKV
- Drop your .3gp files above, or click Upload Files. You can add many files at once.
- MKV is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. FFmpeg runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .mkv files as soon as each one finishes.
What to know about 3GP to MKV conversion
- The video is re-encoded to H.264 video and AAC audio so it plays wherever MKV is supported, and odd frame sizes are adjusted automatically.
- You can change the resolution, frame rate, playback speed and quality (CRF) before converting.
3GP vs MKV
| Feature | 3GP (3GPP Multimedia) | MKV (Matroska Video) |
|---|---|---|
| Codecs used by PureConverter | H.264 (baseline) video and AAC audio | H.264 video and AAC audio |
| Best for | old mobile phones and very low-bandwidth sharing | movies with several audio and subtitle tracks |
| Opens in | VLC, mpv and most media players and most phones | VLC, mpv and most media players, Plex and most smart TVs |
3GP (3GPP Multimedia): A lightweight video container designed for mobile phones and low-bandwidth networks.
MKV (Matroska Video): A flexible, open-standard video container format that can hold unlimited video, audio, picture, or subtitle tracks.
Conversion options
- Resolution: original, 1080p, 720p, 480p or 360p
- Frame rate and playback speed (0.5× to 2×)
- Quality presets or a custom CRF value, and lossless mode
- Audio bitrate, sample rate and channels
Frequently asked questions
Is it safe to convert 3GP to MKV here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several 3GP files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Need the opposite? Convert MKV to 3GP.
Convert 3GP to other formats
- 3GP to MP4
- 3GP to MP3
- 3GP to WEBP
- 3GP to GIF
- 3GP to WAV
- 3GP to MOV
- 3GP to M4A
- 3GP to FLAC
- 3GP to WEBM
- 3GP to AAC
- 3GP to OGG
- 3GP to OPUS
Convert other formats to MKV
- MP4 to MKV
- MOV to MKV
- WEBM to MKV
- AVI to MKV
- WMV to MKV
- FLV to MKV
- M4V to MKV
- MPEG to MKV
- TS to MKV
- OGV to MKV
See every 3GP converter and MKV converter, or browse the full converter directory.