How to convert 3GP to AVI
- Click Choose files or drop your 3GP video into the box above.
- Keep the default quality, or choose a target size, resolution or frame rate.
- Click Convert and download the AVI when it is ready.
3GP vs AVI
| 3GP | AVI | |
|---|---|---|
| Usual codecs | H.263, MPEG-4 or H.264 video with AMR or AAC audio | Usually DivX/Xvid (MPEG-4 Part 2) or MJPEG video with MP3 audio |
| Plays on | Old feature phones and VLC; poorly supported by modern apps | Windows and VLC; poorly supported on phones, Macs and websites |
| Best for | Videos from old mobile phones | Old camcorders, DVD players and legacy Windows software |
| Introduced | early 2000s by the 3rd Generation Partnership Project (3GPP) | 1992 by Microsoft |
About 3GP and AVI
What is 3GP?
3GP is the format older mobile phones recorded video in, designed for small screens and slow networks. Many modern apps and editors cannot open it. Converting 3GP to MP4 makes those old phone videos easy to watch, share and back up.
- Very small files
- Low quality by today’s standards
- Limited support in modern apps
What is AVI?
AVI is one of the oldest video formats still around. Files from older cameras, DVD rips and legacy software are often AVI with DivX/Xvid video. It lacks modern features and produces large files, and phones and websites rarely accept it — but some DVD players, car screens and old editing tools still want AVI.
- Plays on older Windows PCs and DVD players
- Simple, widely recognized
- Large files
- Poor support on phones, Macs and the web
Why GlideConvert?
- Private by design. Your files are converted on your own device by your browser — they are never uploaded to a server. That keeps them private, avoids upload waits and means there is no queue.
- Fast. Images convert in a fraction of a second; video uses your device’s hardware encoder and is often simply repackaged without re-encoding.
- Free. No sign-up, no watermark. 10 images, 5 audio files or one video at a time — Pro lifts the limits and removes ads.
Frequently asked questions
Will converting 3GP to AVI lose quality?
Often not at all. If the 3GP file already contains video and audio that AVI supports (H.264 video and AAC audio are the most common), they are copied as-is: no quality loss, and even a large file converts in seconds. Otherwise the video is re-encoded at high quality — choose a quality level or a target file size in the options.
How long does converting 3GP to AVI take?
Usually much less than the length of the video: modern browsers encode video with your device’s hardware. 3GP needs a universal decoder (FFmpeg compiled to WebAssembly, a one-time ~32 MB download) which is slower — expect roughly real-time speed for HD video.
Which codec does the AVI file use?
MPEG-4 Part 2 video (compatible with DivX/Xvid players) with MP3 audio — the combination most DVD players, car screens and older software expect.
Is there a file size limit?
On the free plan each video or audio file can be up to 500 MB and each image up to 100 MB. With Pro the limit is 4 GB per file. Because everything happens on your device, the practical limit for very large files is your device’s memory.
Are my files uploaded to a server?
No. GlideConvert runs entirely in your browser: images are processed with the browser’s built-in codecs and WebAssembly, video and audio with hardware-accelerated WebCodecs (or a WebAssembly build of FFmpeg for older formats). Nothing is sent anywhere — you can even disconnect from the internet once the page has loaded.
Does it work on iPhone, Android, Mac and Windows?
Yes. It works in any up-to-date browser — Chrome, Edge, Safari, Firefox or Samsung Internet — on phones, tablets and computers, with nothing to install. Long or 4K videos convert faster on a computer than on a phone.