Add your AVI file
Drop one or more .avi files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
AVI to WEBM
Converting .avi video to .webm means re-encoding the picture and sound into a different container and codec family, and this page does it entirely in your browser. Free, private, and validated — the file never leaves your browser.
Private for supported formats — processed in your browser
Runs on your deviceConvert supported files
Drop AVI files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting AVI video to WebM video
Converting .avi video to .webm means re-encoding the picture and sound into a different container and codec family, and this page does it entirely in your browser. An .avi file is Microsoft's Audio Video Interleave container, one of the oldest video wrappers still in circulation. It stores video and audio in alternating chunks inside a RIFF structure, and the extension remains common on older camcorder captures and DivX-era rips.
A .webm file is an open, royalty-free video container built specifically for the web. It restricts itself to free codecs, VP8, VP9, or AV1 for video with Vorbis or Opus for audio, so any browser can play a .webm without patent licensing concerns. For this route the practical draw is free of patent royalties end to end and vP9 and AV1 deliver excellent compression efficiency — balanced against older iPhones and legacy Safari versions cannot play it, which is worth knowing before you commit a large batch.
Why convert AVI to WEBM?
The practical trigger for this conversion is usually a mismatch: with .avi, no streaming support of any kind. Switching to .webm buys you free of patent royalties end to end, which is why it is the better fit for serving HTML5 video without codec license fees. Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
AVI vs WEBM at a glance
| Aspect | AVI video (.avi) | WebM video (.webm) |
|---|---|---|
| Format type | Container — quality depends on the codecs and settings inside | Container — quality depends on the codecs and settings inside |
| How it stores data | interleaves audio and video chunks inside a RIFF file, with the codec identified by a four-character FourCC code | structured as a deliberately restricted subset of Matroska's EBML layout |
| Strongest at | playing back footage digitized from DV and Hi8 tapes | serving HTML5 video without codec license fees |
| Weak spot | no streaming support of any kind | older iPhones and legacy Safari versions cannot play it |
| Metadata | rIFF INFO chunks store basic fields such as title, artist, and encoding software, but nothing comparable to ID3 or MP4 atoms exists | only a minimal set of Matroska tags such as title and language is defined for WebM; the spec deliberately omits attachments and rich tagging |
Pick WEBM as the output
Select .webm in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if WEBM is selectable, the route is real and validated.
Convert on your device
Press Convert. The conversion runs on an FFmpeg engine compiled to WebAssembly, executing entirely inside your browser tab.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid WEBM file. Outputs keep the original filename with the .webm extension.
AVI to WEBM questions, answered
Will converting AVI to WEBM lose quality?
Both sides are re-encoded, so expect a small generation loss controlled by the quality setting: avi is container-oriented and webm is container-oriented. For visually or audibly transparent results keep quality high; for smaller files lower it and compare.
Is it private to convert AVI files here?
Yes — the .avi file is processed inside your browser tab and never uploaded. The conversion runs on an FFmpeg engine compiled to WebAssembly, executing entirely inside your browser tab. Close the tab and the file is gone from memory.
Where will the WEBM file work?
Chrome, Firefox, and Edge have played WebM for over a decade, and Safari added playback in 2021 starting with version 14.1 on macOS, with iOS following in iOS 15. Beyond browsers the picture thins out quickly, since many televisions, set-top boxes, and editors still expect MP4.
Will the WEBM file be bigger or smaller than my AVI?
It depends on the content: structured as a deliberately restricted subset of Matroska's EBML layout. Convert one representative file first and compare before batch-processing a large set.
What happens to the metadata in my AVI file?
This converter strips container metadata deliberately (the FFmpeg command runs with metadata mapping disabled) so exported files do not leak recording details. In the source, rIFF INFO chunks store basic fields such as title, artist, and encoding software, but nothing comparable to ID3 or MP4 atoms exists; none of it is transmitted anywhere because the file never leaves your browser.
Can I convert WEBM back to AVI?
Yes — the reverse route exists as a separate tool. Bear in mind that round-tripping .avi → .webm → .avi is not a perfect undo when any lossy step is involved; keep your original if fidelity matters.