CONVERT AVI → 3GP (AVI to 3GP)
Fast, secure AVI to 3GP conversion. No registration required.
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HOW TO CONVERT AVI → 3GP
Upload the AVI
Drop your AVI 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 3GP
Fetch the converted 3GP as soon as it is ready. Both files auto-delete within two hours.
AVI is a container format from 1992 that wraps video and audio streams in a chunked RIFF structure, with no maximum file size in its later OpenDML extension but no native streaming support and no fixed codec — an AVI file can contain DivX, Xvid, H.264, MJPEG, or dozens of other video codecs paired with PCM, MP3, or AC3 audio. 3GP (3GPP file format) is a constrained subset of the MPEG-4 Part 12 container, standardized by the 3rd Generation Partnership Project specifically for mobile networks with limited bandwidth. It mandates H.263 or MPEG-4 Part 2 (or optionally H.264 Baseline) for video, and AMR-NB or AAC-LC for audio, with resolutions historically capped at QCIF (176x144) or CIF (352x288) for standard 3GP and up to 640x480 for the 3G2 sibling. Converting AVI to 3GP is a process of transcoding whatever codec lives inside the AVI wrapper into one of those mobile-mandated codecs and repackaging into the MPEG-4-derived container — the output file is typically 80 to 95 percent smaller than the source, at a significant cost to visual fidelity.
Why convert AVI to 3GP
The primary driver is legacy mobile compatibility. Older Android devices, feature phones, and some embedded media players in cars or budget set-top boxes from the 2010s will not play AVI at all, especially when the internal codec is Xvid or DivX. 3GP was the universal denominator for MMS video attachments and ringtone-length clips on GSM and CDMA networks, and devices from Nokia, Sony Ericsson, and early Samsung Galaxy lines expose 3GP natively in their gallery apps without any third-party player. A secondary use case is reducing file size for upload to platforms with strict size limits: a two-minute QCIF 3GP at 64 kbps video and AMR audio sits well under 1 MB, compared to tens of megabytes for the same clip in an AVI-wrapped H.264 stream.
AVI vs 3GP — Technical specifications
Side-by-side comparison of the technical details.
AVI
- MIME type
- video/x-msvideo
- Extension
- .avi
- Container
- RIFF
- Max file size
- 2 GB (original); 4 GB (OpenDML extension)
- Codec support
- Any codec via FourCC identifiers
- MIME Type
- video/x-msvideo
- Category
- Video Files
- Full Name
- AVI Video
- Conversion Engine
- FFMPEG
3GP
- Extension
- .3gp
- Container
- MPEG-4 Part 14 subset
- MIME Type
- video/3gpp
- Category
- Video Files
- Full Name
- 3GPP Video
- Conversion Engine
- FFMPEG
- MIME types
- video/3gpp, video/3gpp2
- Extensions
- .3gp, .3g2
- Video codecs
- H.263, MPEG-4 SP, H.264
- Audio codecs
- AMR-NB, AMR-WB, AAC
| Specification | AVI | 3GP |
|---|---|---|
| MIME type | video/x-msvideo | — |
| Extension | .avi | .3gp |
| Container | RIFF | MPEG-4 Part 14 subset |
| Max file size | 2 GB (original); 4 GB (OpenDML extension) | — |
| Codec support | Any codec via FourCC identifiers | — |
| MIME Type | video/x-msvideo | video/3gpp |
| Category | Video Files | Video Files |
| Full Name | AVI Video | 3GPP Video |
| Conversion Engine | FFMPEG | FFMPEG |
| MIME types | — | video/3gpp, video/3gpp2 |
| Extensions | — | .3gp, .3g2 |
| Video codecs | — | H.263, MPEG-4 SP, H.264 |
| Audio codecs | — | AMR-NB, AMR-WB, AAC |
AVI vs 3GP — Strengths and limitations
What each format does best, and where it falls short.
AVI Strengths
- Simple, well-documented format — trivial for any video library to parse.
- Universal Windows playback since Video for Windows in 1992.
- Low encoding overhead — interleaved structure is fast to write.
- Works with any codec technically, including modern ones.
Limitations
- Aging container — no native support for chapters, subtitles, or multi-audio selection.
- File-size limits (2 GB original, 4 GB with OpenDML) break for HD content.
- Variable-framerate video causes sync drift.
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.
Quality & Compatibility
AVI carries no alpha channel in any common codec, so transparency is not a concern here. The critical quality loss is in the video bitrate: H.263 at typical 3GP bitrates (32–128 kbps) is a lossy DCT codec with 8x8 block quantization, and block artifacts are visible at anything above moderate motion. MPEG-4 Part 2 (the codec inside most 3GP files) offers slightly better compression efficiency than H.263 at the same bitrate but still falls far short of H.264's efficiency. Audio fidelity drops sharply if AMR-NB is selected: it encodes narrowband speech at 4.75–12.2 kbps and cuts frequency response above roughly 3.4 kHz, making music sound telephone-quality. AAC-LC at 48–96 kbps preserves more audio range. Frame rate is typically capped at 15 fps for QCIF targets, down from the 24–30 fps common in AVI sources. Metadata embedded in AVI RIFF chunks (INAM, IART, ICMT tags) does not transfer to 3GP, which uses MPEG-4 udta atoms with a different schema — custom metadata is lost.
Tips for Best Results
- Keep the source AVI resolution at or below 352x288 before converting; scaling a 1080p AVI down to QCIF causes the encoder to discard so much spatial detail that the output looks smeared — crop or scale to CIF first if the source is widescreen HD.
- Choose AAC-LC over AMR-NB for the audio codec if the clip contains music or mixed sound; AMR-NB is engineered solely for voice and will make background audio unintelligible at typical 3GP bitrates.
- If the target device is any Android 4.0 or later phone rather than a feature phone, request H.264 Baseline Profile inside the 3GP container instead of H.263 — both fit in .3gp but H.264 delivers visibly better quality at the same file size while remaining playable on MediaPlayer-based apps.
Frequently Asked Questions
Only when it has to. If the codecs inside AVI (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".
AVI Video
Source formatAVI is a legacy Microsoft multimedia container that stores audio and video data. While largely superseded by modern formats, it remains widely recognized and is produced by many older devices and screen recorders.
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.
Going the other way? Convert 3GP back to AVI with the same engine.
Common Use Cases
Share across platforms
Send 3GP files to anyone without worrying about whether they have the right software for AVI.
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 AVI 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.
AVI vs 3GP — Typical file sizes
Approximate file sizes for common scenarios.
- 10-min video (XviD / MP3) 100-200 MB
- 45-min TV episode (DivX) 350-700 MB
- 2-hour movie (DVD rip) 700 MB - 1.4 GB
- 1-min MMS video (176×144) 300-800 KB
- 5-min phone clip (320×240) 5-15 MB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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