MKV to 3GP converter
Convert MKV to 3GP in seconds, free and unlimited. No upload, no sign-up, no watermark: your video never leaves your device.
Last updated
Quick answer: To convert MKV to 3GP, add the MKV file to the iHateFiles MKV to 3GP converter and press Convert. The conversion runs in your browser, so the file is never uploaded, and it is free with no sign-up, watermark or size limit. Re-encodes the picture and sound into a 3GP container.
Should you convert MKV to 3GP?
Do this when something specifically needs 3GP. The picture is re-encoded, so it costs a little quality; if all you need is a file that plays everywhere, MP4 is usually the better target.
The picture is re-encoded
An MKV usually holds almost any codec, often H.264 or H.265 with several audio and subtitle tracks. This writes H.264 Baseline video with AAC sound at 96 kbps into the 3GP. Both sides are compressed with loss, so this is a second generation: leave the quality at its default or higher, because the encoder is working from MKV artefacts rather than the original.
Extra tracks may not survive
An MKV can carry several audio tracks and subtitle tracks. 3GP holds one picture and one sound, so this conversion keeps the main video and the first audio track. If you need the subtitles, save them first with Extract Subtitles.
Where the 3GP will play
3GP plays on old feature phones, VLC, and most modern players.
MKV and 3GP side by side
| MKV | 3GP | |
|---|---|---|
| Inside the file | almost any codec, often H.264 or H.265 with several audio and subtitle tracks | H.264 Baseline video with AAC sound at 96 kbps |
| Compression | Lossy | Lossy |
| Carries sound | Yes | Yes |
| Plays on | VLC, Plex, most smart TVs and Android, but not the iPhone Photos app or QuickTime | old feature phones, VLC, and most modern players |
| Here | Read and write | Read and write |
What usually goes wrong
About the MKV. MKV and WEBM share a signature because WEBM is a restricted Matroska, so tools sometimes report one as the other. What matters is the codecs inside.
About the 3GP. Converting a 3GP does not improve it. The detail was never recorded, and upscaling only makes the file bigger.
How to convert MKV to 3GP
- Add your MKV file. It is read from your disk and stays there.
- Check the settings. The output format is already set to 3GP.
- Press convert and the 3GP file is saved back to your device.
Questions
How do I convert MKV to 3GP?
Open this page, add your MKV file, and press convert. The file is decoded and re-encoded by your own browser and saved back to your device. Nothing is uploaded.
Is this MKV to 3GP converter free?
Yes, completely. There is no account, no sign-in, no watermark and no daily limit, because there is no server doing the work. Your own device does it.
Are my files uploaded anywhere?
No. There is no upload endpoint. The conversion runs inside this browser tab, so your file never leaves your device. You can open your browser's network panel and watch: nothing carrying your file is sent.
Is there a file size limit?
No fixed limit. Because the work happens on your machine there is no server quota. The only ceiling is your own device's memory, which for video means very large files may be slow.
Will converting to 3GP lose quality?
3GP is a lossy format, so some detail is discarded. The quality control on this page decides how much. The default is set high enough that most people cannot see the difference.
Can I convert several MKV files at once?
Yes. Add as many as you like and they are converted one after another, then offered as a single ZIP.