Convert 3GA to MP4 — Free Online Converter

MP4 (MPEG-4 Part 14) is the universal multimedia container format — the de facto standard for video and audio on the internet, mobile devices, and virtually every media platform. Converting 3GA recordings from old Samsung, Nokia, and LG phones to MP4 creates files that play on literally every modern device and platform without exception. From iPhones to Android phones, Windows PCs to Linux desktops, web browsers to smart TVs, MP4 is the one format that works everywhere.

The conversion transcodes the AMR audio from the 3GA container into AAC-LC and wraps it in the MP4 container. The output is an audio-only MP4 file (functionally similar to M4A but with the .mp4 extension) that media players handle as a standard audio file. The MP4 extension has the advantage of being recognized by systems that might not associate .m4a with audio playback, making it even more universal than M4A for cross-platform compatibility.

MP4 is the single most compatible media format in existence. Every smartphone, computer, tablet, smart TV, game console, and web browser made in the last 15 years plays MP4 files natively. When you convert old 3GA recordings to MP4, you eliminate every possible compatibility barrier. There is no device or platform that will refuse to play an MP4 file with AAC audio — it is the universal common denominator for digital media.

The .mp4 extension also has stronger file type associations than .m4a on many systems. Windows file explorers, email clients, messaging apps, and web servers all recognize .mp4 and apply appropriate MIME types automatically. For users who want the absolute safest format choice for sharing old phone recordings across different platforms and recipients, MP4 is the most reliable option available.

FFmpeg decodes the AMR-NB (8 kHz) or AMR-WB (16 kHz) audio from the 3GA container and re-encodes it as AAC-LC (192 kbps, 44.1 kHz) in the MP4 container (MPEG-4 Part 14). The output uses the 'isom' brand in the ftyp box for maximum compatibility across players. The moov atom is placed at the beginning of the file (faststart) for instant playback and progressive download without buffering. No video track is included — the file is audio-only MP4.