Convert 3G2 to MP4 — Free Online Converter

MP4 (MPEG-4 Part 14) is the universal standard for digital video — supported by every modern device, browser, social media platform, and media player on the planet. Converting 3G2 to MP4 is the single most useful conversion you can perform on old CDMA phone recordings, transforming files from an obsolete container into the format that plays everywhere without exception.

The 3G2 container was designed for a specific cellular ecosystem (CDMA2000) that no longer exists. MP4 is the container that replaced all mobile video formats, backed by the H.264 codec that every device manufactured since 2007 can decode in hardware. This conversion ensures your old phone recordings are preserved in a format that will remain playable for decades to come.

There is no modern device or platform that cannot play MP4. iPhones, Android phones, Windows PCs, Macs, Linux desktops, smart TVs, game consoles, web browsers, social media platforms — all support MP4 natively. Converting 3G2 to MP4 makes your old phone recordings universally accessible without any special software, codec packs, or format explanations.

MP4 also provides a rich metadata framework for organizing your recordings. You can add titles, creation dates, GPS coordinates, descriptions, and even cover images to each file. This transforms anonymous 3G2 blobs into properly cataloged, searchable videos in any media library. For long-term preservation, MP4's ISO standardization ensures format support will continue indefinitely.

FFmpeg re-encodes the 3G2 H.263 or MPEG-4 Part 2 video to H.264 (libx264) at CRF 23 for a good quality-to-size balance, with AAC-LC audio at 128 kbps. The MP4 container is finalized with faststart (moov atom moved to front) for instant web playback. Resolution is preserved from the source to avoid unnecessary upscaling. The encoder uses yuv420p pixel format for universal hardware decoder compatibility. For maximum compatibility, the H.264 profile is set to Main at Level 3.1.