AVI to 3GP Converter

Converting AVI to 3GP: What This Tutorial Covers

AVI is Microsoft's Audio Video Interleave, a RIFF-based container from the Video for Windows era that usually holds Xvid, DivX, MPEG-4 or MJPEG video with MP3 or PCM audio. 3GP is the 3GPP mobile container, built on the same ISO base media file format (ISO/IEC 14496-12) as MP4 but profiled for phone-era codecs and bitrates. This page re-encodes one into the other, and it is written for the narrow group who genuinely need .3gp — a feature phone, an MMS gateway, an embedded player or a test harness. If you only want a smaller, modern file, convert AVI to MP4 instead; that is the right answer for almost everyone.

How to Convert AVI to 3GP

1. Upload Your AVI File: Drag your .avi onto the page or click "Add Files". Several clips can be queued at once and they all run with the same settings.
2. Pick the Video Codec: Video Codec opens on H.264, which holds detail best at 3GP's low bitrates and is understood by most handsets from roughly 2009 onward. Switch to H.263 or MPEG-4 only when the target device predates H.264 support.
3. Set the Audio Codec and Resolution: The Audio Codec list offers AAC, AMR Narrow Band and AMR Wide Band. Under Video resolution, use Width x Height to enter an exact frame size, or Preset Resolutions for a quick step down; Trim takes a start time and duration if you only need part of the clip.
4. Convert and Download: Click Convert and save the .3gp. No sign-up, no watermark. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours.

Walk-through: Matching the Codec to the Device

3GP is a low-bandwidth format, so the codec pair matters far more than any quality slider. Pick to match the receiving hardware, not to maximise fidelity.

Both AMR variants are speech codecs with a fixed sample rate and a single channel, so the converter resamples and downmixes to suit. That is fine for voice and destructive for music — if the soundtrack matters at all, choose AAC.

H.263 Accepts Only Five Picture Sizes

This is the single most common reason an AVI-to-3GP job fails, and it is a property of the H.263 standard rather than of any one tool. The encoder implements the standard picture formats and rejects everything else outright.

In our testing, the H.263 encoder accepted exactly those five sizes and refused everything in between — 320 × 240 and even 192 × 144 fail with an encoder error rather than being rounded to something close. So if you choose H.263, set Video resolution to Width x Height and type one of the values above. The Preset Resolutions list is height-based, so "144p" gives you 192 × 144 or 256 × 144 depending on your source's aspect ratio, neither of which H.263 will take. If you need an arbitrary size such as 320 × 240, use MPEG-4 or H.264 instead — both accept any even dimensions.

Common Errors and How to Fix Them

• "The conversion failed with an encoder error" — Almost always H.263 with a non-standard frame size. Set Width x Height to 176 × 144 (or another value from the table), or switch the Video Codec to MPEG-4.
• "The 3GP looks blocky and soft next to my AVI" — Expected. 3GP targets phone-era bitrates and frame sizes, and re-encoding an already-compressed AVI adds a second generation of lossy compression. Keep the resolution no smaller than the device needs and leave Video Codec on H.264 to limit the damage.
• "The audio sounds like a phone call" — You selected AMR Narrow Band, which is a fixed 8 kHz mono speech codec. Choose AAC if the soundtrack contains music or anything you want to sound natural.
• "My phone or MMS gateway rejects the file" — The codec or the frame size is too modern. Try H.263 at 176 × 144 with AMR Narrow Band, which is the widest-compatibility legacy combination.
• "The file is still too big for MMS" — Trim the clip with the Time Range controls, drop the resolution, and use Specific file size under File Compression to cap the output. Gateway limits are typically a few hundred kilobytes.

When This Doesn't Work

If the AVI is DRM-protected, truncated or otherwise damaged, the encoder cannot read it and the job fails — check that the file plays end to end in VLC first. And if you reached for 3GP only because you wanted a smaller video that still plays on current phones and computers, it is the wrong target: its codec profile and resolution ceiling belong to the 3G era. AVI to MP4 gives you a modern, well-compressed, broadly compatible file instead. If you are going the other way and trying to modernise old phone footage, 3GP to MP4 is the page you want. And if the device you are feeding is a CDMA-era handset, it may want .3g2 rather than .3gp — AVI to 3G2 writes the 3GPP2 variant.

Frequently Asked Questions

Why would anyone convert AVI to 3GP today?

Only because something on the receiving end requires it: an older feature phone, an MMS gateway, an embedded player, or a test harness that ingests .3gp by specification. For general use MP4 is smaller at equal quality and plays on essentially every current device, so 3GP is a compatibility target rather than a quality or convenience one.

What is the difference between 3GP and 3G2?

Both are built on the ISO base media file format, the same foundation as MP4, but .3gp is the 3GPP container designed around GSM and UMTS networks while .3g2 is the 3GPP2 container for CDMA2000 devices — the older Verizon and Sprint handsets in the United States, for example. They differ in which codecs and brand identifiers are permitted. This page writes .3gp; if a device specifically asks for the CDMA variant, use the 3G2 converter instead.

Which video codec should I choose if I do not know the target device?

H.264, which is what the control opens on. It gives the best picture at the low bitrates 3GP implies and is decoded by the widest range of handsets made since roughly 2009. Fall back to H.263 only when you know the device is older than that, and remember it will then force you onto one of the five standard picture sizes.

Will the 3GP look worse than the original AVI?

Usually yes, and that is the format doing its job. 3GP exists to make video small enough for a mobile network, so it works at low bitrates and small frame sizes; re-encoding into it discards detail to hit that budget. You can limit the loss by not shrinking further than the target device needs and by leaving the Video Codec on H.264, but a 3GP will not match a full-resolution AVI.

Can I keep the original AVI soundtrack as-is?

No. The server re-encodes the audio into whichever codec you select, because AVI's typical MP3 or PCM track is not a 3GP audio format. That means one more generation of lossy encoding for an MP3 source. Choosing AAC keeps the added loss small; choosing either AMR variant deliberately trades fidelity for a very small file, since AMR is a mono speech codec.

What frame size should I use for an old phone?

Match the handset's screen where you can, and use 176 × 144 when you cannot find out. That size is QCIF, the standard 3GPP picture format, and it is accepted by H.263, MPEG-4 and H.264 alike. Going larger risks a file the phone will not open; going smaller than the screen throws away quality for no benefit.

How do I get the file under an MMS size limit?

Combine three controls rather than relying on one. Trim the clip to the shortest useful section using the Time Range start time and duration, drop the frame size under Video resolution, and then set Specific file size under File Compression to the cap you need. Because the file-size target works against duration and resolution you have already reduced, doing it in that order gives a far better-looking result than compressing a long clip alone.

How are my files handled after conversion?

Your AVI is uploaded over an encrypted connection, re-encoded on our servers, and both the upload and the finished .3gp are deleted automatically after a few hours. There is no sign-up, no watermark, and files are never shared or made public.