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ConvertAnyVideo

3GP to MKV Converter

Convert 3GP videos to MKV in seconds. Change resolution, quality and frame rate if you like — all in your browser.

or drop files here

Up to 1 GB per file · Files never leave your device

  • 100% free
  • No sign-up
  • No upload — private
  • No watermark

How to convert 3GP to MKV

  1. Add your 3GP files

    Click “Choose Files” or drag and drop your 3GP videos onto this page.

  2. MKV is selected

    The output is already set to MKV. Open Advanced settings if you want to change the quality, resolution or length.

  3. Convert and download

    Click Convert. Your MKV file is ready in moments — nothing is uploaded.

About the formats

3GP

3GPP Multimedia

3GP is a lightweight video format designed for mobile phones. Its small file size makes it useful for older phones and slow connections.

MKV

Matroska Video

MKV (Matroska) is a flexible open container that can hold several audio tracks, subtitles and chapters in one file. It is popular for movies and series.

Frequently asked questions

How do I convert 3GP to MKV?

Click “Choose Files” and select your 3GP file (or drag it onto the page). MKV is already selected as the output, so just click Convert and download your MKV file when it’s ready.

Will I lose quality converting 3GP to MKV?

When the video inside your 3GP file is compatible with MKV, it is copied without re-encoding, so there is no quality loss at all. Otherwise it is re-encoded at high quality. You can pick the quality yourself in Advanced settings.

Is it safe to convert 3GP files here?

Yes. Conversion runs inside your own web browser, so your files are never uploaded to our servers or anyone else’s. Nobody can see them, and nothing is stored after you close the tab.

Is the 3GP to MKV converter free?

Yes, it’s completely free. There’s no sign-up, no watermark and no limit on how many files you convert. Each file can be up to 1 GB.

Can I convert several 3GP files at once?

Yes. Add as many 3GP files as you like and convert them in one go, then download them one by one or together as a ZIP file.

Convert 3GP to other formats

Convert other formats to MKV