Convert MP4 to 3GP Online

Convert MP4 to 3GP: video for Nokia, Motorola, Samsung feature phones and MMS

The 3GP (Third Generation Partnership Project) format was defined by the 3GPP consortium in technical specification 3GPP TS 26.234 Release 4, published in 2001, as the standard video format for third-generation mobile networks (UMTS/WCDMA). Between 2003 and 2012, virtually every camera-equipped phone in the world — from the Nokia 3650 (the first Nokia handset with video recording capability, launched in 2003) to the last S40 platform models like the Nokia Asha 311 (2012) — recorded and played back video exclusively in 3GP format. Motorola, Samsung, LG, Sony Ericsson, Siemens, and all pre-smartphone era manufacturers adopted 3GP as the universal format for mobile video recording without exception. The specification defines two main profiles: the basic profile with H.263 (the ITU-T videoconferencing codec, adopted by 3GPP because it was the only video codec that ARM processors of 2002–2006 could decode in real time) or MPEG-4 Part 2 Simple Profile for the most basic phones, and the extended profile with H.264 Baseline Profile for the more advanced models of the era, such as the Nokia N-Series from 2006. For video sent via MMS (Multimedia Messaging Service, defined by the OMA MMS 1.3 specification), 3GP format at QCIF (176×144) or CIF (352×288) resolution was the only format accepted by most European, Asian, and Latin American mobile carriers between 2004 and 2010. In 2025, Nokia, Samsung, and Tecno feature phones remain active in sub-Saharan Africa, South Asia, and parts of Latin America, representing over 25% of devices in use according to GSMA data. The 3G2 format, defined by 3GPP2 for CDMA networks used in North America by Verizon and Sprint, uses the same codec set and is also supported.

The technical conversion from MP4 to 3GP involves re-encoding the H.264 High Profile video stream (the standard profile in MP4 from modern cameras and smartphones since 2010) to the H.264 Baseline Level 1.3 profile, the maximum supported by basic 3GPP terminals running on ARM hardware from 2003-2010. The Baseline Profile removes advanced encoding tools present in the High Profile: B-frames (bidirectional reference frames that improve compression efficiency but require more complex decoders), CABAC (Context-Adaptive Binary Arithmetic Coding, H.264's most efficient entropy coding mode, requiring approximately 10-15% more decoder complexity), and interlaced field coding. Output resolution is reduced to CIF (352x288 pixels) or QCIF (176x144 pixels) depending on the target device, as ARM processors from 2004-2010 such as the Texas Instruments OMAP1710 (used in Nokia N70 and N80) or Qualcomm MSM6500 (used in early Motorola 3G models) cannot decode resolutions above CIF at Baseline profile in real time without dropped frames. Audio is converted from stereo AAC-LC (standard in MP4 from any modern camera) to mono AAC-LC at 24-32 kbps, sufficient for the speaker quality of feature phones without wasting storage space. Typical video bitrate is 200-400 kbps, producing files of 400-800 KB per minute of content, compatible with the flash storage limits of basic phones (generally 8 to 64 MB of internal memory) and with the MMS size limits historically set by carriers between 300 KB and 600 KB depending on the market and operator. For MP4 and MKV files with video in Main or High profiles that include B-frame references, the profile downgrade to Baseline also involves reorganizing the decode and presentation timestamp order (DTS vs PTS), which FFmpeg.wasm handles automatically during re-encoding without any user intervention required.

Convertir.ai runs the MP4 to 3GP conversion entirely in the browser via FFmpeg.wasm without sending any files to external servers. This tool covers several well-defined use cases in 2025: retrotech enthusiasts and collectors of Nokia S40, Motorola RAZR V3, Samsung SGH-D500, and other iconic pre-smartphone era feature phones who want to transfer and watch modern videos on their classic devices; journalists, photographers, and humanitarian workers operating in areas with limited connectivity where Nokia feature phones remain the only device available to many contacts; enterprise application developers and messaging system engineers who need to generate 3GP content for legacy mobile communications management platforms; and carriers or messaging service providers distributing video content via MMS in markets where feature phones remain in active use. The tool is especially valuable in public health and humanitarian aid contexts across sub-Saharan Africa and South Asia, where organizations such as UNICEF, MSF, and the Red Cross distribute educational video messages via MMS to field workers using feature phones. For all these cases, the tool guarantees that the generated 3GP file fully complies with the technical specifications of 3GPP TS 26.234 Release 7, with the correct H.264 Baseline profile, appropriate CIF or QCIF resolution, and the mono AAC-LC audio required by these devices, without any software installation and with complete privacy guaranteed by local processing. No registration required, no watermarks, and fully offline capable once the page is loaded. The tool also supports 3G2 (.3g2), the sister format defined by 3GPP2 for CDMA networks (used by Verizon and Sprint in the United States), using an identical conversion pipeline since the codec set is the same. Both formats are supported as output.