AVI Converter Free & Private
The classic Windows video container. Convert AVI Video files entirely in your browser — no upload, no account.
About AVI Video
AVI (Audio Video Interleave) was introduced by Microsoft in 1992 as part of Video for Windows. Despite its age, AVI remains widely encountered in legacy archives, security cameras, and older editing workflows. It stores video and audio streams in an interleaved format, which made it efficient for early hard drives but lacks modern features like native streaming or variable frame rates.
Technical details
| Container | AVI (.avi) — RIFF-based |
| Video codecs | MPEG-4, DivX, Xvid, Motion JPEG, uncompressed |
| Audio codecs | MP3, PCM, AC-3 |
| Max resolution | No formal limit (typically up to 4K) |
| Streaming | Not designed for streaming |
| Metadata | Limited (basic RIFF INFO tags) |
Best for
Legacy system compatibility, archival of older video, security camera footage
Advantages
- Extremely broad legacy playback support
- Simple interleaved structure — easy to parse
- Can hold uncompressed video for editing
Limitations
- No native subtitle track support
- 2 GB file size limit without OpenDML extensions
- No variable frame rate or modern codec support
- Larger files compared to MP4 at equivalent quality
Convert other formats to AVI
AVI compatibility
Windows (all versions), VLC, most media players; limited mobile/browser support
Why privacy matters for file conversion
Most online converters upload your files to remote servers where they may be scanned, stored, or shared. This tool is different — the conversion runs in your browser via WebAssembly or the WebCodecs API. Your files stay on your device. Always.
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Frequently asked questions
AVI files often use less efficient codecs or even uncompressed video. Converting to MP4 with modern codecs can reduce file size by 50-80% with minimal quality loss.
For new projects, MP4 or MKV are better choices. Convert existing AVI files to preserve them in a modern format with smaller file sizes.
Yes, completely free with no file limits. The conversion engine runs directly in your browser — we have zero server costs for processing, so we can offer it at no charge.
Your file never leaves your device. The conversion engine runs 100% in your browser using WebAssembly or the WebCodecs API. We have no access to your files — no uploads, no logs, no data collection whatsoever.
On desktop browsers (Chrome, Firefox, Edge) files up to 500 MB convert reliably. On Safari (macOS) the practical limit is around 200 MB. On iPhone and iPad, keep files under 50 MB — iOS enforces tight memory limits for browser-based processing.
On your first visit, the browser downloads the conversion engine (24–50 MB depending on which backend is used). This is cached locally, so subsequent conversions load much faster.
Chrome, Edge, and Brave use hardware-accelerated WebCodecs when the format is supported — this is 5–10× faster than software encoding. For unsupported formats the tool falls back to ffmpeg.wasm, where Firefox typically performs best.
Utterly is a privacy-first transcription app for Apple devices. It uses on-device AI to transcribe and translate audio — no cloud, no subscription required to start. This free converter is brought to you by the Utterly team.