AVIF to 3G2 Converter

Convert AVIF to 3G2: What This Tutorial Covers

.3g2 is the 3GPP2 container built for CDMA2000 handsets — the old Verizon and Sprint phones — and it shares the same ISO base media structure (ISO/IEC 14496-12) as .3gp and .mp4. Turning an AVIF still into one produces a silent clip that holds a single picture for a duration you choose; feed it an animated AVIF instead and the motion is carried through. This tutorial covers both paths, the settings that actually decide whether the file plays on the far end, and the cases where you should reach for MP4 instead.

How to Convert AVIF to 3G2

1. Upload Your AVIF File: Drag and drop your .avif onto the page or click "Add Files". Add several at once and use Merge strategy — Merge images (the default) joins them into one clip, Video per image returns a separate .3g2 per file.
2. Set Image Duration: Open Image Duration and choose how long each still is held on screen. The dropdown runs from 1/60 of a second up to 10 seconds per frame, and defaults to 5 seconds per frame.
3. Pick a Background Color and Quality Preset: AVIF can carry an alpha channel and video cannot, so transparent pixels are composited onto the Background Color — White by default, and the same colour fills any letterbox bars. Leave Quality Preset on "Very High (Recommended)" unless you are chasing a size target.
4. Convert and Download: Click Convert and save the .3g2. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours — no sign-up, no watermark.

Walk-through: Duration, Codec, and Frame Size

Three settings decide whether the result is usable, and they interact.

• Image Duration sets the clip length for a still source. Five seconds is the default; a 1/30s or 1/24s selection produces a single-frame clip that most players will show as a flash, which is what you want if the .3g2 is only a container for one picture. Duration is ignored for an animated AVIF, because the source already carries its own frame timing.
• Video Codec is where compatibility lives. The output defaults to H.264, and the container also accepts H.263, MPEG-4 (Part 2) and Xvid. H.263 is the lowest common denominator for genuinely old CDMA handsets; if a device refuses the default file, switch to it before changing anything else.
• Video resolution offers Keep original, Fixed Resolutions, Preset Resolutions, or explicit Width / Height / Width x Height. 3G2 was designed around small phone screens, so a full-resolution AVIF scaled down to something like 320x240 or 426x240 both plays more reliably and lands far under an MMS-sized payload.

For finer control, File Compression also exposes Constant Quality and Constraint Quality alongside the preset — bitrate and file-size targeting modes don't appear for image sources, so when a gateway enforces a hard byte ceiling, work from a short Image Duration, a small resolution, and a lower preset or higher CRF.

What the Converter Does With Each Kind of AVIF Input

3G2 vs 3GP vs MP4

Common Errors and How to Fix Them

• "The video looks frozen" — expected for a still source. One picture becomes one repeated frame held for the Image Duration; it does not animate. Start from an animated AVIF, or from a real video, if you need motion.
• "There is no sound" — also expected. An image file has no audio track, so nothing reaches the encoder and the output is silent. The Audio Codec control has nothing to act on here.
• "The transparent background turned white" — that is the Background Color default doing its job. Video formats cannot store an alpha channel, so pick Black or another colour from the dropdown before converting.
• "The handset rejects the file" — switch Video Codec from H.264 to H.263 and drop to a small Preset Resolution. Early CDMA phones frequently decode only H.263.
• "The picture looks soft" — 3G2 targets tiny screens at low bitrates. Keep Quality Preset on Very High, avoid shrinking the resolution below what the device needs, and accept that a sharp AVIF will not survive intact.
• "The file is too large to send" — shorten the Image Duration, pick a smaller Preset Resolution, or drop the Quality Preset a step or two (file-size targeting modes don't appear for image sources).

When This Doesn't Work

3G2 only makes sense when something on the receiving end specifically demands the CDMA container — a legacy handset, an MMS workflow, or a test harness that refuses anything else. That need is now rare: Verizon set 31 December 2022 as the end of its CDMA service and states that the network was decommissioned as of 3 January 2023, so the carriers that made .3g2 matter in the US are gone. For anything you actually intend to watch or share, use AVIF to MP4. If you need the GSM sibling container rather than the CDMA one, use AVIF to 3GP, and if you only wanted a picture in the first place, AVIF to JPG is the right stop.

Frequently Asked Questions

Does converting AVIF to 3G2 animate my image?

Only if the AVIF itself is animated. A still AVIF becomes a single frame repeated for the Image Duration, so playback looks frozen. AVIF can also store an image sequence, and our converter content-probes each upload for one — when it finds an animation track, every frame is transcoded into the .3g2 at the source's own timing instead.

Why is the 3G2 file silent?

Because neither a still nor an animated AVIF carries an audio track, so there is nothing for the encoder to write. A .3g2 would normally hold CDMA-era speech codecs such as EVRC, QCELP or SMV, but an image source leaves the audio stage with no input, and the result is a video-only file.

What is the difference between .3g2 and .3gp?

Both are ISO base media files, but .3gp is 3GPP's container for GSM/UMTS phones while .3g2 is 3GPP2's for CDMA2000 phones. The video codecs overlap almost entirely; the meaningful split is audio, where 3G2 adds the CDMA speech codecs (EVRC, QCELP, SMV). If your target is a GSM-lineage device, use AVIF to 3GP instead.

Which video codec does the 3G2 output use?

H.264 by default. The Video Codec control also offers H.263, MPEG-4 (Part 2) and Xvid, all of which the 3GPP2 file format accommodates. H.264 gives the cleanest picture at 3G2's low bitrates; H.263 is the safest choice for the oldest handsets.

How long is the clip, and can I change it?

It is exactly the Image Duration you pick, which defaults to 5 seconds per frame. Selecting a fraction such as 1/30s produces a one-frame clip; selecting 10 seconds holds the picture for ten. When you merge several stills into one video, the duration applies to each frame, so five images at 5 seconds each yield a 25-second clip.

What happens to my AVIF's transparency?

It is flattened. Our pipeline composites alpha onto the Background Color before scaling — deliberately before the pixel-format conversion, so the colour reaches the picture itself and not just the letterbox bars. White is the default; change it in the Background Color dropdown if a black or coloured matte suits the image better. If you need the alpha channel intact, keep the file as an image and use AVIF to PNG.

Is 3G2 or MP4 the better target for a still-as-video clip?

MP4, for essentially every modern use. It stores the same H.264 video, is understood by every current phone, browser and editor, and does not carry 3G2's low-bitrate design assumptions. Choose 3G2 only when a specific device or gateway names it. AVIF to MP4 is the direct route.

Are my uploaded files kept or shared?

No. Your AVIF travels over an encrypted connection, is processed on our servers, and is deleted automatically after a few hours along with the .3g2 we produce. There is no sign-up, no watermark, and nothing is shared or made public.