Convert 3GP to FLAC — Free Online Converter

3GP files from mobile phones store audio as AMR (narrow-band at 8 kHz) or AAC within a 3GPP multimedia container originally designed for GSM networks. FLAC (Free Lossless Audio Codec) is an open-source format that compresses audio to 50-70% of the PCM original with zero quality loss, widely supported across Linux, Android, macOS, and streaming platforms. Converting 3GP to FLAC extracts the audio and losslessly preserves every decoded sample in a compact, future-proof format.

FLAC has become the archival standard for audio preservation because it is open-source, lossless, and supported by virtually every audio player and streaming service. Unlike WAV or AIFF, FLAC compresses the data significantly while remaining bit-perfect. For 3GP voice recordings that you want to preserve indefinitely — family memories, interviews, legal recordings — FLAC offers the best balance of archival fidelity and storage efficiency. It also supports rich metadata tags (Vorbis comments) for organizing your collection.

FFmpeg extracts the audio stream from the 3GP container, decodes AMR or AAC to raw PCM, then encodes the PCM using the FLAC encoder with configurable compression level (0-12, where higher means smaller files but slower encoding). The Vorbis comment metadata system allows tagging with title, artist, date, and custom fields. Output sample rate matches the source unless resampling is specified. FLAC supports sample rates up to 655,350 Hz and bit depths up to 32.