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First run downloads FFmpeg (~25 MB) once in this browser. Need a smaller MP4? Try /compress-video.

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3GP to MP4 converter online free

Convert 3GP to MP4 online free in your browser. Transfer old 3GP phone videos to MP4 with adjustable quality — no server upload required.

What is a 3GP to MP4 converter?

A 3GP to MP4 converter changes older 3GP phone videos into the widely supported MP4 format (usually H.264 + AAC). This tool runs locally in your browser with FFmpeg WebAssembly, so your files are not uploaded to a server.

3GP to MP4 converter features

Browser-based conversion from 3GP to MPEG-4 MP4.

  • Convert 3GP to MP4 online

    Upload a .3gp file and download a compatible MP4 in your browser.

  • Transfer 3GP to MP4

    Move old mobile recordings into a format that plays on modern devices.

  • Adjustable quality

    Tune H.264 CRF to balance visual quality and file size.

  • No server upload

    FFmpeg WebAssembly processes video on your device for better privacy.

  • Web-ready MP4

    Output uses H.264, AAC, and faststart for broad playback compatibility.

How to convert 3GP to MP4 online

Convert a 3GP file to MPEG-4 MP4 in three steps.

  1. Upload 3GP file

    Drop or select your .3gp video (up to 200 MB).

  2. Set quality (CRF)

    Keep the default CRF 23 for balanced quality, or lower CRF for sharper output.

  3. Convert and download

    Click Convert to MP4, then download the result.

Great for

Common 3GP to MP4 conversion scenarios.

  • Old phone videos

    Open legacy 3GP clips from older phones on modern players and apps.

  • Sharing and uploads

    Convert 3GP to MP4 before posting to platforms that prefer MPEG-4.

  • Editing workflows

    Standardize 3GP footage to MP4 for editors and NLE tools.

  • Archive migration

    Transfer 3GP libraries into a more future-proof MP4 container.

Frequently Asked Questions

Quick answers about this tool—open a question to read more.