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H264 → 3GP
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Fast, secure H264 to 3GP conversion. No registration required.
H264 is a video container, so playback depends on the codec inside as well as the wrapper itself. Reaching a 3GP from there is one hop. A H264 to 3GP conversion rescues a clip that refuses to play somewhere important — a phone, a smart TV, a web uploader. KaijuConverter uses FFmpeg under the hood, the same engine video professionals rely on, and prioritises stream-copy over re-encode so the output stays faithful to the source. In practice H264 is a video container, so playback depends on the codec inside as well as the wrapper itself. On the other end, 3GP is the mobile video container standardised by 3GPP for early smartphones.
H.264 Raw Stream
Source formatH.264 raw stream is an elementary bitstream containing only the video data encoded with the H.264/AVC codec without any container. It is commonly used as an intermediate format in video processing pipelines and for hardware encoder output.
3GPP Video
Target 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.
Why convert H264 to 3GP
The usual reason to convert from H264 into 3GP is the same reason anyone transcodes video: the original container is not accepted where you are trying to send the file. Swapping to 3GP flips that rejection into a clean upload without altering the footage itself.
HOW TO CONVERT
H264 → 3GP
Provide the H264 clip
Upload through the browser; transfers are encrypted end-to-end and files are quarantined per session.
Convert to 3GP
The conversion keeps resolution, frame rate and bit depth identical to the source unless you explicitly override them.
Save to your device
Click download to pull the 3GP to local storage; share the short-lived URL with collaborators if needed.
Common Use Cases
Share across platforms
Send 3GP files to anyone without worrying about whether they have the right software for H264.
Embed in documents
Drop 3GP output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
3GP often produces smaller files than H264 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.
H264 vs 3GP — Strengths and limitations
What each format does best, and where it falls short.
H264 Strengths
- Universal hardware decode on every device since ~2010.
- 40-50% smaller than MPEG-2 at equal quality.
- Mature ecosystem with dozens of encoders (x264 is the open-source gold standard).
- Every browser, phone, TV, and car infotainment supports H.264.
- Supports everything from 144p vertical phone video to 8K HDR masters.
Limitations
- Patent-encumbered — encoding royalties apply for commercial use.
- 30-50% larger than H.265/AV1 at equivalent quality.
- Raw .h264 bytestreams have no timecode — containers (MP4/MKV) add that.
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.
H264 vs 3GP — Technical specifications
Side-by-side comparison of the technical details.
H264
- MIME type
- video/h264
- Extensions
- .h264, .264, .avc (raw bytestream)
- Standard
- ITU-T Rec. H.264 / ISO/IEC 14496-10 (AVC)
- Typical containers
- MP4, MKV, MOV, TS, FLV
- Profiles
- Baseline, Main, High, High 10, High 4:2:2, High 4:4:4
3GP
- Extensions
- .3gp, .3g2
- MIME types
- video/3gpp, video/3gpp2
- Container
- MPEG-4 Part 14 subset
- Video codecs
- H.263, MPEG-4 SP, H.264
- Audio codecs
- AMR-NB, AMR-WB, AAC
| Specification | H264 | 3GP |
|---|---|---|
| MIME type | video/h264 | — |
| Extensions | .h264, .264, .avc (raw bytestream) | .3gp, .3g2 |
| Standard | ITU-T Rec. H.264 / ISO/IEC 14496-10 (AVC) | — |
| Typical containers | MP4, MKV, MOV, TS, FLV | — |
| Profiles | Baseline, Main, High, High 10, High 4:2:2, High 4:4:4 | — |
| MIME types | — | video/3gpp, video/3gpp2 |
| Container | — | MPEG-4 Part 14 subset |
| Video codecs | — | H.263, MPEG-4 SP, H.264 |
| Audio codecs | — | AMR-NB, AMR-WB, AAC |
H264 vs 3GP — Typical file sizes
Approximate file sizes for common scenarios.
H264
- 1080p 30fps @ 5 Mbps (1 min) ~37 MB
- 4K 60fps @ 35 Mbps (1 min) ~260 MB
- HD streaming (1 hour, 6 Mbps) ~2.7 GB
3GP
- 1-min MMS video (176×144) 300-800 KB
- 5-min phone clip (320×240) 5-15 MB
Quality & Compatibility
The conversion does not upscale or sharpen the video. A 1080p H264 produces a 1080p 3GP; a 4K source stays 4K unless you select a lower output resolution explicitly. Picking higher bitrates does not improve perceived quality beyond the source ceiling.
Tips for Best Results
- If your H264 has variable frame rate, force a constant frame rate in 3GP to avoid stuttering on some players and streaming platforms.
- For screen recordings at high resolution, quality 22 CRF H.264 keeps text perfectly readable at a fraction of the source size.
- Check the audio track after transcoding — some H264 containers carry unusual audio codecs that downgrade subtly when remapped to 3GP.
Frequently Asked Questions
Only when it has to. If the codecs inside H264 (usually H.264 or H.265 for video, AAC for audio) are accepted by 3GP, 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".
Related comparisons
See these formats side by side to understand which fits your use case best.
Related Guides
H.264/AVC Video Codec: Complete Technical Guide
Complete technical guide to H.264/AVC video codec: motion compensation, intra prediction, profiles (Baseline/Main/High), levels, CRF quality, x264 encoder settings, and container formats.
Read guide3GP Files: Mobile Video Format History, Codecs, and Conversion
Complete guide to 3GP mobile video files — technical specs (H.263, AMR, H.264), FFmpeg conversion to MP4/MP4, player compatibility, 3G2 differences, and feature phone era history.
Read guideMobile Video Formats: 3GP, MP4, and HEVC Explained
Understand mobile video formats from legacy 3GP to modern HEVC/H.265. What format does your phone record in? How to convert old 3GP files to MP4.
Read guideSecure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 60 minutes. We never read, share, or store your data.