AVI to WebM Converter

How to Convert AVI to WebM Online

1. Upload Your AVI File: Drag and drop or click "Add Files" to select AVI files. Old camcorder recordings, DivX / Xvid downloads, archived TV captures, and Windows-era video files all work. Batch is supported.
2. Pick a Codec and Quality: Default is VP9 (Google's modern web video codec). Choose AV1 for the smallest output on modern devices, or VP8 for legacy compatibility. Set a quality preset (Highest → Lowest), target a percentage of the original size or an exact size in MB, or fine-tune with CRF (VP9: 18 = visually lossless, 30 = default for web, 36 = small).
3. Resize or Trim: Pick a resolution preset (1080p / 720p / 480p / 360p), enter custom width × height, scale by percentage, or trim using start time + duration in HH:MM:SS.sss format. Old AVI recordings often benefit from being downscaled to 480p / 720p for the web.
4. Convert and Download: Click Convert. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared.

Why Convert AVI to WebM?

AVI (Audio Video Interleave) is Microsoft's container from 1992 — used for decades to store DivX / Xvid / MPEG-2 / MJPEG video. It's deeply legacy: most modern web tools, browsers, and editors don't accept AVI directly. WebM is Google's open-source web video format, designed for HTML5 <video> and royalty-free. Common reasons to convert AVI → WebM:

• HTML5 <video> embedding — AVI doesn't play in any browser. WebM plays in Chrome, Firefox, Edge, Opera, and Safari 16+ desktop / 17.4+ iOS via <source type="video/webm"> (partial VP9 decode in Safari 14–15; full support from Safari 16 desktop).
• Modernizing legacy archives — Old TV captures, DivX downloads, and consumer camcorder AVIs from 2000-2010 can be re-encoded to WebM at half the size with better quality.
• Smaller files — Modern VP9 / AV1 codecs are 60-80% more efficient than DivX / Xvid in AVI. A 1 GB AVI typically becomes a 200-400 MB WebM at high-quality settings, visually near-identical to the source for most content.
• Royalty-free codec for commercial use — DivX / Xvid in AVI may have licensing implications. WebM (VP8 / VP9 / AV1) is unambiguously free for commercial streaming, paid platforms, and embedded video.
• Self-hosting on a website — Convert your AVI library to WebM for self-hosted streaming without H.264 / DivX licensing concerns.
• Fixing playback issues — Modern players sometimes fail on old AVIs (codec missing, A/V desync, partial corruption). Re-encoding to WebM normalizes the file and fixes most playback issues.

AVI vs WebM — Format Comparison

Codec Choice for the WebM Output

Frequently Asked Questions

Why won't my AVI play on modern devices?

AVI is a legacy container that depends on the right codec being installed locally — DivX, Xvid, or older MPEG-2. Modern browsers, phones, and most media apps don't ship with these codecs. Even Windows Media Player on current Windows often shows an error. Converting to WebM (or MP4) gives you a file that plays in every browser without codec packs.

Will I lose quality converting AVI to WebM?

There's a small re-encoding loss since DivX / Xvid and VP9 / AV1 are different codecs. At CRF 18-22 the difference is invisible in normal viewing. The default preset produces near-source quality at 60-80% smaller file size — the older the AVI's codec, the bigger the size reduction.

Will Safari users be able to play the WebM?

Safari 14 introduced partial VP9 decode, but full WebM playback arrived in desktop Safari 16 and iOS Safari 17.4. For pre-Safari-16 or pre-iOS-17.4, embed both formats — WebM first, MP4 fallback second. See AVI to MP4 for the fallback file.

Should I pick VP9, AV1, or VP8?

VP9 for almost everything — universal modern browser support, fast server-based conversion. AV1 for archival of large libraries when you want the smallest possible files and don't mind slower encoding. VP8 only for very old Android devices or extreme legacy compatibility — rarely needed.

Can I batch convert old AVI files?

Yes — drop in folders of AVI files. They convert in parallel withon our servers and download individually or as a single ZIP. Useful for modernizing a multi-year archive of camcorder recordings or DivX downloads.

Can I trim or cut while converting?

Yes. Use the trim section to enter a start time and duration. Both accept seconds (12.5) or HH:MM:SS.sss format (00:01:30.500). Trim first to skip dead air, intro graphics, or test patterns at the start of old TV captures.

Will the audio survive?

Yes. AVI's MP3 / AC-3 / PCM audio is decoded and re-encoded to Opus (default for WebM) or Vorbis. Audio quality is preserved — Opus at 96-128 kbps is transparent for music. Multi-channel AC-3 audio is downmixed to stereo Opus by default.

What if my AVI is corrupted or has A/V sync issues?

The conversion process can sometimes fix mild corruption and sync drift by re-encoding cleanly from the start. For severely corrupted AVIs, the converter may fail or produce truncated output. Try a tool like FixAVI or VLC's "Save as" feature first to repair the AVI, then convert the repaired file.