OpenAnyFile
Works
Viewing, inspecting and verifying. You get a full player with scrubbing, volume and fullscreen — provided your browser has a codec for the stream inside. File details, exact byte size and the detected signature are always shown.
How to open a .avi file
The short version: AVI is an Audio Video Interleave from Microsoft. The longer version — including the quirk that trips most people up — is below, along with a viewer that runs entirely on your own device.
What is a .avi file?
Audio Video Interleave is a video format developed by Microsoft, first appearing in 1992. It is normally produced by Legacy camcorders, old rips.
A RIFF container from the Video for Windows era. It has no native support for modern B-frames or variable frame rate, causing the classic AVI audio-drift problem.
| Full name | Audio Video Interleave |
|---|---|
| File category | Video |
| MIME type | video/x-msvideo |
| Magic bytes (file signature) | 52 49 46 46 .. 41 56 49 20 |
| Developer | Microsoft |
| Introduced | 1992 |
| Usually created by | Legacy camcorders, old rips |
| OpenAnyFile engine | HTML5 video player |
| Opens without upload | Yes — parsed locally in your browser |
Open a .avi file in your browser
OpenAnyFile routes .avi to its HTML5 video player, which plays a full player with scrubbing, volume and fullscreen — provided your browser has a codec for the stream inside.
- Open the OpenAnyFile opener in this browser — nothing to download or sign up for.
- Drag your .avi file onto the drop zone, click to browse for it, or paste it with Ctrl+V.
- The extension is detected and the file is handed to the HTML5 video player.
- Your AVI opens on its own viewer page: a full player with scrubbing, volume and fullscreen — provided your browser has a codec for the stream inside.
- Use fullscreen for a closer look, or download the file back out unchanged. Free, and free in the sense that there is no paid tier waiting behind step three.
What you can and cannot do with it here
Does not work
Editing and re-saving. OpenAnyFile is a reader, not an editor — for changes you still need special software or an equivalent.
Why your {ext} file is never uploaded
Most online viewers work by sending your file to their server, processing it there, and leaving a copy behind on infrastructure you do not control. OpenAnyFile does not. Your .avi file is read through the browser's local File API and decoded by JavaScript and WebAssembly running on your own machine. There is no upload step and no server-side copy — open your browser's network tab while you do it and watch: the file never appears.
Frequently asked questions about AVI files
Can I open a .avi file without installing special software?
Yes. OpenAnyFile's HTML5 video player runs in your browser, so you can read a AVI file with nothing installed. You get a full player with scrubbing, volume and fullscreen — provided your browser has a codec for the stream inside. For full editing you still need the original application — this is a viewer, not an editor.
How can I check a file really is a AVI file?
Look at the first bytes rather than the extension. A genuine AVI begins with 52 49 46 46 .. 41 56 49 20. Opening the file in OpenAnyFile shows that signature in the file-details panel, so a file renamed to .avi by mistake is easy to spot.
Is it safe to open a AVI file online?
With OpenAnyFile, yes, because nothing is uploaded. The file is read locally through your browser's File API and never leaves your device, so there is no server copy to leak, log or retain. That matters most for the kind of file people are least willing to hand to a random converter site.
What is a .avi file, exactly?
Audio Video Interleave — a video/x-msvideo format created by Microsoft since 1992. A RIFF container from the Video for Windows era. It has no native support for modern B-frames or variable frame rate, causing the classic AVI audio-drift problem.
Does the same viewer handle formats related to AVI?
Yes — the same engine also opens .mp4, .mkv, .mov, so you can compare related files without switching tools.
Related formats
These open with the same engine, so if you have one of these sitting next to your .avi file, it will open too: