CONVERT 3GP → OPUS (3GP to OPUS)
Fast, secure 3GP to OPUS conversion. No registration required.
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HOW TO CONVERT 3GP → OPUS
Start the job
Upload your 3GP; the pipeline auto-detects the audio codec and the best extraction strategy.
Demux to OPUS
FFmpeg pulls the audio track out of the 3GP container and writes a clean OPUS.
Save the result
Click download. The video track never leaves our processing container unmodified — we only returned the audio you asked for.
Here is the short version — 3GP is the mobile video container standardised by 3GPP for early smartphones. Hence the need for OPUS. Strip a 3GP down to just its OPUS audio track for playback on devices that cannot (or should not) show video. This is how most audiobook and podcast workflows start — take a 3GP master, emit a OPUS distribution copy, discard the picture track. Context: 3GP is the mobile video container standardised by 3GPP for early smartphones. Opus is the modern low-latency royalty-free codec used in VoIP, streaming, and WebRTC.
Why convert 3GP to OPUS
OPUS is the lingua franca of audio: car stereos, Bluetooth speakers, voice assistants and music apps all expect it. A 3GP cannot be uploaded to most of those ecosystems, but the OPUS you extract today will play anywhere tomorrow.
3GP vs OPUS — 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
- MIME Type
- video/3gpp
- Extension
- .3gp
- Category
- Video Files
- Full Name
- 3GPP Video
- Conversion Engine
- FFMPEG
OPUS
- Extensions
- .opus, .ogg (container)
- MIME Type
- audio/opus
- Extension
- .opus
- Category
- Audio Files
- Full Name
- Opus Audio
- Conversion Engine
- FFMPEG
- MIME type
- audio/opus
- Standard
- RFC 6716 (2012)
- Sample rates
- 8, 12, 16, 24, 48 kHz
- Latency
- 5-60 ms (configurable)
| Specification | 3GP | OPUS |
|---|---|---|
| MIME types | video/3gpp, video/3gpp2 | — |
| Extensions | .3gp, .3g2 | .opus, .ogg (container) |
| Container | MPEG-4 Part 14 subset | — |
| Video codecs | H.263, MPEG-4 SP, H.264 | — |
| Audio codecs | AMR-NB, AMR-WB, AAC | — |
| MIME Type | video/3gpp | audio/opus |
| Extension | .3gp | .opus |
| Category | Video Files | Audio Files |
| Full Name | 3GPP Video | Opus Audio |
| Conversion Engine | FFMPEG | FFMPEG |
| MIME type | — | audio/opus |
| Standard | — | RFC 6716 (2012) |
| Sample rates | — | 8, 12, 16, 24, 48 kHz |
| Latency | — | 5-60 ms (configurable) |
3GP vs OPUS — 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.
OPUS Strengths
- Best-in-class quality across the entire bitrate range.
- Royalty-free and patent-free.
- Ultra-low latency — suitable for live voice and music.
- Handles speech and music equally well — no need to switch codecs.
- Mandatory codec in WebRTC, so supported in every browser by design.
Limitations
- Very low hardware decoder adoption — software-only on most phones.
- Older platforms (legacy Windows apps, old cars) may not play .opus files.
- Container semantics confusing — Opus lives inside Ogg, WebM, or MP4.
Quality & Compatibility
Metadata such as track title, artist and chapter markers survive when the 3GP carries them in a form the OPUS supports. If the source 3GP lacks tagging, the OPUS will be untagged — that is not a conversion bug, it is simply the source data.
Tips for Best Results
- For spoken-word content (podcasts, lectures), 64-96 kbps is indistinguishable from higher rates and saves storage dramatically.
- For music, do not drop the OPUS bitrate below the audio bitrate of the source 3GP, otherwise you introduce a second lossy stage.
- Record your extraction settings once and reuse them — consistent bitrate and sample rate across an archive makes downstream tooling happier.
Frequently Asked Questions
Yes. The free tier accepts files up to 25 MB without registration, email capture or watermarks; paid plans go up to 2 GB. Paid plans raise the size cap, enable batch conversions and provide a REST API for automation, but nothing on the free tier is quality-limited — the output is exactly the same as on any paid plan.
Only if the audio codec inside 3GP is not directly writable into the OPUS container. When codecs match we stream-copy, producing a bit-exact OPUS. When they differ, we re-encode at a high-quality default, so the perceptual loss is tiny for anything other than lossless-to-lossless mismatches.
Uploads run over HTTPS, files are processed in isolated containers, and both the source 3GP and the OPUS output are auto-deleted within two hours. No account is required, file contents are never logged, and KaijuConverter does not use uploads for AI training. The paid plan adds a signable data-processing agreement for regulated workflows.
No. The full 3GP lands in our processing container, we demux the audio locally and then the container is destroyed. The video bytes never leave KaijuConverter infrastructure and auto-delete within two hours along with the original file.
Most files finish in well under a minute. Small images and documents are typically ready in a few seconds; large video or audio files scale roughly with duration. Upload speed from your network is usually the dominant factor, not server time.
Yes. The Advanced options let you set start and end times in HH:MM:SS, so you can extract a single chapter, a specific quote or a clean sample instead of the full duration of the 3GP.
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.
Opus Audio
Target formatOpus is a versatile, open-source audio codec optimized for both speech and music at very low bitrates. It is the standard for WebRTC voice calls and excels at real-time communication.
Common Use Cases
Share across platforms
Send OPUS files to anyone without worrying about whether they have the right software for 3GP.
Embed in documents
Drop OPUS output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
OPUS 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 OPUS — Typical file sizes
Approximate file sizes for common scenarios.
- 1-min MMS video (176×144) 300-800 KB
- 5-min phone clip (320×240) 5-15 MB
- Voice call (24 kbps) 180 KB/min
- Podcast (48 kbps) 21 MB/hour
- Music (128 kbps) ~1 MB/min
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Related comparisons
See these formats side by side to understand which fits your use case best.
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