3GP to MULAW | Fast & Free & Secure
Convert 3GP to MULAW online in seconds. No signup. Secure processing; files auto-delete in ~2h. Works on mobile & desktop.
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What is 3GP?
3GP is a mobile-oriented multimedia container defined by the 3rd Generation Partnership Project (3GPP) for GSM/UMTS networks. Built on the ISO Base Media File Format (the same family as MP4), a .3gp file packages compressed video, audio, and metadata for efficient storage and transmission. Typical video codecs include H.264/AVC, H.263, or MPEG-4 Part 2; audio commonly uses AAC-LC/HE-AAC or AMR-NB/WB. 3GP also supports 3GPP Timed Text for subtitles. The format was designed for very low bitrates, MMS, and early phone cameras, so files are small but not always high fidelity. Most players—VLC, QuickTime, Android and many converters—open 3GP, though modern workflows usually transcode to MP4 for broader compatibility and streaming. Remember: 3GP is a container, not a codec; actual quality depends on the streams inside.
What is μ-law (MULAW)?
μ-law (often written mulaw or u-law) is a companding algorithm used in telephony and VoIP to encode audio with ITU-T G.711. It maps linear PCM to a logarithmic scale, squeezing a wide dynamic range into 8-bit samples at 8 kHz (64 kbps). Using a compression parameter μ=255, it preserves low-level speech detail while keeping implementation simple and latency negligible. μ-law is standard in North America and Japan; Europe typically uses A-law. You’ll encounter it in .wav files tagged G.711 μ-law or raw headers like .ulaw/.mulaw. It’s excellent for speech over the 300–3400 Hz band, call recording, SIP trunks, and PBX systems, but not ideal for music or wideband audio. Common conversions include μ-law ↔ linear PCM, Opus, or AAC for modern streaming.
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