Convert AVI to WEBM
Convert AVI files to WEBM in seconds. Free, no upload, no watermark. Trim, compress or edit before you convert.
or drag & drop videos, audio or images here, or paste with Ctrl+V
MP4 · MOV · MKV · AVI · WebM · WMV · FLV · GIF · MP3 · WAV · M4A · and 40+ more
- Files never leave your device
- No sign-up, no watermark
- Free forever
How to convert AVI to WEBM
- Add your AVI fileClick “Choose files” or drag & drop your AVI file onto the page.
- Check the outputWEBM is pre-selected. Optionally trim, crop, compress or tweak quality in the tabs.
- Convert & downloadClick “Convert & download”. Your WEBM file is created on your device and saved instantly.
AVI vs WEBM
Short answer: WebM is an open, royalty-free format designed for the web. It uses VP8 or VP9 video with Opus or Vorbis audio and is natively supported by Chrome, Firefox, Edge and modern Safari.
What is AVI?
AVI is a classic Microsoft video container. It is still used by older software, DVD players and some cameras.
What is WEBM?
WebM is an open, royalty-free format designed for the web. It uses VP8 or VP9 video with Opus or Vorbis audio and is natively supported by Chrome, Firefox, Edge and modern Safari.
Quality
If the video and audio codecs inside your AVI file are already compatible with WEBM, we copy them without re-encoding: it's instant and lossless. Otherwise we re-encode with a high-quality setting (adjustable with the Quality slider).
| AVI | WEBM | |
|---|---|---|
| Full name | Audio Video Interleave | WebM (Matroska-based) |
| Type | video | video |
| Best for | Legacy software, older media players and Windows apps | Websites, HTML5 video and open-source projects |
| MIME type | video/x-msvideo | video/webm |
Last updated 2026-11-13
AVI to WEBM: FAQ
Is this AVI to WEBM converter free?
Yes. Converting AVI to WEBM is completely free with no watermark, no sign-up and no file limits beyond what your device can handle. Optional Pro features like 4K export and AI subtitles are available if you need them, and a single 4K export can be unlocked without a subscription.
Are my AVI files uploaded to a server?
No, never. The conversion runs entirely in your web browser using FFmpeg compiled to WebAssembly. Your AVI file never leaves your computer or phone, and we never store it, which makes it private and fast.
Will I lose quality converting AVI to WEBM?
If the video and audio codecs inside your AVI file are already compatible with WEBM, we copy them without re-encoding: it's instant and lossless. Otherwise we re-encode with a high-quality setting (adjustable with the Quality slider).
How do I convert AVI to WEBM on iPhone or Android?
Open this page in Safari or Chrome on your phone, tap “Choose files”, pick your AVI file and tap “Convert & download”. No app install needed.
Can I convert multiple AVI files to WEBM at once?
Yes. Select several files and click “Convert all”. You can download them one by one or as a ZIP. Free users can batch-convert up to 5 files at a time; Pro removes the limit.
Can I edit the AVI before converting?
Yes: trim, cut, crop, rotate, resize, change speed, adjust colour, add text, music or subtitles, and more, all before you export to WEBM.