CONVERT
3GP → MP4
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Convert mobile 3GP recordings to standard MP4 format.
3GP was built for third-generation mobile networks — the clue is in the name. The format emerged from the 3GPP consortium around 2002 to solve a specific problem: shipping video over narrow-band cellular connections where bandwidth was measured in tens of kilobits per second. To hit those targets, 3GP pairs H.263 or MPEG-4 Part 2 video with AMR-NB or AAC audio inside an MPEG-4 Part 12 container. The codec choices were deliberate and aggressive: AMR-NB operates at 4.75–12.2 kbps and is optimized for voice, not music or ambient sound. H.263 tops out well below HD. The result is a container that is technically an ISO Base Media File Format derivative — meaning it shares DNA with MP4 — but imposes strict codec and resolution constraints that most modern software either refuses outright or silently mishandles. A 3GP file shot on a Nokia or early-generation Android in 2007–2012 will not play in most 2024 video editors, media servers, or social platforms. Converting to MP4 replaces the constrained codec envelope with H.264 or H.265 video and AAC or MP3 audio inside a fully standard MPEG-4 Part 14 container, which is accepted natively on every major OS, browser, and platform without plugins or workarounds.
3GPP Video
Source format3GP is a multimedia container designed for 3G mobile phones. It stores video and audio at low bitrates optimized for limited bandwidth. Many early mobile phone recordings use this format.
MP4 Video
Target formatMP4 is the most universally supported video container format. It typically uses H.264 or H.265 video codecs with AAC audio, providing an excellent balance of quality and file size across all devices and platforms.
Why convert 3GP to MP4
Most video editors, streaming platforms, and social networks reject 3GP outright or accept it inconsistently. Windows Media Player on Windows 10 and 11 often fails to render 3GP, and iMovie, DaVinci Resolve, and Premiere Pro treat it as an unknown format without additional codec packs. YouTube and Instagram accept MP4 as a primary ingest format and have historically dropped or re-encoded 3GP with poor results. Beyond compatibility, 3GP files encoded with H.263 lack the entropy coding efficiency of H.264, so the same visual quality at modern resolutions costs more bitrate in 3GP than in MP4-H.264. If the original was recorded at a low bitrate — 64–256 kbps is typical for 3GP clips from feature phones — the conversion cannot recover lost detail, but it does unlock the file for editing, archival, and distribution workflows that the original container simply cannot enter.
HOW TO CONVERT
3GP → MP4
Upload the 3GP
Drop your 3GP onto the uploader. Files up to 25 MB run on the free tier without registration; paid plans go up to 2 GB.
Stream-copy or re-encode
FFmpeg probes the codecs; if compatible, it stream-copies (no quality loss). Otherwise it transcodes at matching bitrate.
Download the MP4
Fetch the converted MP4 as soon as it is ready. Both files auto-delete within two hours.
Common Use Cases
Share across platforms
Send MP4 files to anyone without worrying about whether they have the right software for 3GP.
Embed in documents
Drop MP4 output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
MP4 often produces smaller files than 3GP for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
3GP vs MP4 — Strengths and limitations
What each format does best, and where it falls short.
3GP Strengths
- Extremely low bitrate and file size — great for 2G/3G networks.
- Universal playback in feature phones and early smartphones.
- Based on MP4 — easy to convert and handle with modern tools.
- Mandatory codec in every 3G device since 2001.
Limitations
- Tiny resolutions — rarely above 320×240 in practice.
- H.263 video is far behind H.264 in compression efficiency.
- Metadata support is minimal.
MP4 Strengths
- Universal playback — every browser, phone, TV, game console, and editing suite reads MP4.
- Supports modern codecs (H.264, H.265, AV1) with no container changes.
- Progressive streaming works with the "moov atom" at the start of the file.
- Carries subtitles, chapters, multiple audio tracks, and embedded metadata.
- ISO-standardized (ISO/IEC 14496-14) and patent-licensable via MPEG LA.
Limitations
- Codec licensing (H.264, H.265) carries royalty costs for commercial use.
- Streaming requires the moov atom at the start — a misplaced atom breaks web playback.
- Not ideal for lossless or professional editing workflows (use ProRes or DNxHD instead).
3GP vs MP4 — Technical specifications
Side-by-side comparison of the technical details.
3GP
- MIME types
- video/3gpp, video/3gpp2
- Extensions
- .3gp, .3g2
- Container
- MPEG-4 Part 14 subset
- Video codecs
- H.263, MPEG-4 SP, H.264
- Audio codecs
- AMR-NB, AMR-WB, AAC
MP4
- Container
- ISO Base Media File Format (ISO/IEC 14496-12)
- MIME type
- video/mp4
- Common video codecs
- H.264 (AVC), H.265 (HEVC), AV1, VP9
- Common audio codecs
- AAC, MP3, FLAC, Opus
- Max file size
- Practically ~16 TB; 2^63 bytes theoretical
- Streaming
- Supported with faststart (moov atom at front)
| Specification | 3GP | MP4 |
|---|---|---|
| MIME types | video/3gpp, video/3gpp2 | — |
| Extensions | .3gp, .3g2 | — |
| Container | MPEG-4 Part 14 subset | ISO Base Media File Format (ISO/IEC 14496-12) |
| Video codecs | H.263, MPEG-4 SP, H.264 | — |
| Audio codecs | AMR-NB, AMR-WB, AAC | — |
| MIME type | — | video/mp4 |
| Common video codecs | — | H.264 (AVC), H.265 (HEVC), AV1, VP9 |
| Common audio codecs | — | AAC, MP3, FLAC, Opus |
| Max file size | — | Practically ~16 TB; 2^63 bytes theoretical |
| Streaming | — | Supported with faststart (moov atom at front) |
3GP vs MP4 — Typical file sizes
Approximate file sizes for common scenarios.
3GP
- 1-min MMS video (176×144) 300-800 KB
- 5-min phone clip (320×240) 5-15 MB
MP4
- Smartphone video (1080p, 1 min) 60–120 MB
- 4K video (1 min, H.265) 200–400 MB
- Streamed movie (90 min, H.264) 1–4 GB
- Social clip (15s, H.264, 720p) 3–8 MB
Quality & Compatibility
3GP to MP4 is a transcode, not a lossless rewrap, unless the source video track already uses MPEG-4 Part 2 or H.264 and the audio uses AAC, in which case stream-copy is possible and introduces zero generation loss. In the common case where the video is H.263 and the audio is AMR-NB, both streams must be decoded and re-encoded: H.263 becomes H.264 and AMR-NB becomes AAC. This re-encode discards the AMR-NB voice codec characteristics, which is generally an improvement for non-voice content but means voice recordings may sound subtly different in timbre. Bit depth stays at 8-bit per channel; 3GP never carried high bit-depth content. No alpha channel exists in either format at the video level. Embedded metadata such as GPS coordinates and device timestamps stored in 3GP udta or moov atoms may or may not survive depending on the transcoder; GPS data is common in older Android 3GP clips and is often silently dropped.
Tips for Best Results
- If your 3GP file contains only voice or a phone call recording, expect the AMR-NB to AAC transcode to add a slight reverb tail or change the frequency response above 3.4 kHz, since AMR-NB deliberately band-limits to that frequency for voice compression — this is not a bug in the converter, it is the original codec boundary becoming audible after re-encode.
- 3GP files from feature phones often carry GPS location atoms (udta/loci) with latitude and longitude baked in. If privacy matters, verify that your converter strips or lets you suppress these atoms before sharing the resulting MP4 — the coordinate data is not visible in most players but is readable with any metadata tool.
- If the source 3GP was recorded at 176x144 (QCIF) or 352x288 (CIF) — the two resolutions standardized in 3GPP Release 4 — the MP4 output will inherit those non-standard dimensions. Most platforms upscale or letterbox correctly, but if you need clean 720p or 1080p output you must set a target resolution explicitly, accepting that the converter is interpolating content that was never captured at that detail level.
Frequently Asked Questions
Only when it has to. If the codecs inside 3GP (usually H.264 or H.265 for video, AAC for audio) are accepted by MP4, we stream-copy — the bytes are repackaged into the new container with zero re-encoding and no quality loss. When the source uses a codec the target does not support, we transcode at a matching bitrate to keep the visual quality close to the original.
With stream copy, expect the job to finish in seconds to tens of seconds regardless of video length — the work is mostly rewriting the container. Transcoding is slower (roughly real-time: a ten-minute clip takes about ten minutes) because every frame must be decoded and re-encoded. The progress bar shows which mode applies.
Yes. Resolution, frame rate, colour space and bit depth are preserved by default; stream copy is literally bit-identical on these parameters. If you explicitly pick a lower bitrate or a different codec in Advanced, the output is rebuilt to those settings, but the default is always "match the source".
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Read guideSecure & Private Conversion
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