How much smaller will my AVI get as WebM?

Typically 40-60% smaller at matching quality — a 700 MB Xvid-era movie file often lands around 300-350 MB as VP9. The gain comes purely from two decades of codec progress; nothing about the source's actual detail changes.

Why can't the converter just copy the video into the WebM?

Because nothing in an AVI sits on WebM's short approved codec list — DivX, Xvid, and MP3 are all prohibited there. A full transcode is therefore mandatory rather than a stream copy, which is also why the conversion takes real time.

Which browsers play the converted file?

Chrome, Firefox, and Edge have played WebM natively for over a decade, and Safari added support in its Big Sur-era releases. Very old iOS devices remain the gap, so bandwidth-critical sites usually keep an MP4 fallback alongside.

AVI to WEBM Converter – Free & Online

Convert AVI to WEBM

Turn AVI files into WEBM in seconds — free, secure, and no signup required.

Free tier: 5 conversions/day, files up to 50 MB, ad-supported. Need more? See Pro plans →

256-bit SSL encryptionYour files are protected end-to-end

Lightning-fast conversionsProcess files in seconds, not minutes

All major video formatsMP4, AVI, MOV, MKV & more

No registration requiredStart instantly — 5 free conversions a day

Files auto-deleted in 1 hourGDPR-friendly: we never keep your files

Turning AVI files into WebM re-encodes aging DivX or Xvid footage as royalty-free VP9 video that HTML5 browsers stream natively. The size drop is usually dramatic, since VP9 needs a fraction of the bitrate the 2000s-era codecs inside AVI files did.

Convert AVI to WEBM – Free Online AVI to WEBM Converter

Why convert AVI to WEBM?

Publish digitized camcorder or DivX-era footage on a website using the plain HTML5 video tag, no plugins involved.
Cut hosting and bandwidth costs — VP9 commonly matches Xvid quality at less than half the bitrate.
Keep an all-open pipeline for Wikimedia uploads and other platforms that favor royalty-free codecs.

Tip: WebM only allows VP8, VP9, or AV1 with Opus or Vorbis audio, so every AVI goes through a complete re-encode — budget more conversion time than a simple rewrap would take.

How to convert AVI to WEBM

Upload your AVI file using the area above.
WEBM is preselected as the target format.
Click Start and wait for the conversion to finish.
Download your converted WEBM file.

Convert AVI to WEBM

Convert AVI to WEBM – Free Online AVI to WEBM Converter

Why convert AVI to WEBM?

How to convert AVI to WEBM

AVI to WEBM — Frequently Asked Questions