Informazioni sui file WEBM

WEBM (WebM Video · Formato video)

Rilasciato 2010 Di Google

WebM Video (.webm) è un formato di file standard supportato da KaijuConverter per l’archiviazione, la condivisione e la conversione multipiattaforma.

Famiglia

Video Files

Estensione

.webm

Tipo MIME

video/webm

Utilizzabile come

Input Output

La storia

COME WEBM
È NATO.

2010

2013

2018

2021

WebM was born out of a Google acquisition. In February 2010 Google bought On2 Technologies for $124 million, then open-sourced their VP8 video codec and paired it with Vorbis audio inside a stripped-down Matroska container. The result, announced at Google I/O 2010, was WebM — a royalty-free video format explicitly designed to compete with H.264 on the open web.

Firefox, Opera, and Chrome supported WebM from day one; Microsoft Edge followed later; Safari in 2021. VP8 was eventually superseded by VP9 (2013), and VP9 by AV1 (2018), but they all shipped inside WebM containers. YouTube uses WebM for VP9 and AV1 streams to billions of viewers. Today it is the default HTML5 <video> format for any web publisher who wants royalty-free playback.

CURIOSITÀ E
ANEDDOTI.

WebM is literally a restricted subset of MKV — only VP8/VP9/AV1 video + Vorbis/Opus audio are allowed.

YouTube re-encodes every video into WebM at multiple resolutions automatically.

Google released the entire codec source under BSD license the day it launched — extremely rare for a video codec.

WebRTC video calls in browsers default to VP8 inside WebM because of the patent-free guarantee.

The Chromium, Firefox, and Opera codebases all ship libvpx for encoding VP9 — it is one of the most widely deployed video codec libraries ever.

PUNTI DI FORZA E
LIMITAZIONI.

Punti di forza

Patent-free and royalty-free — no licensing worries for encoders.
First-class HTML5 <video> support across browsers.
AV1 inside WebM offers best-in-class compression (30-50% smaller than H.264).
Low overhead — the container strips everything MKV does not need.
Powered by battle-tested libvpx and dav1d reference decoders.

Limitazioni

Limited codec palette — cannot carry H.264 or HEVC streams.
Encoding AV1 or VP9 at quality is slow.
Hardware decoders for AV1 are still catching up on older devices.
Professional video tools (Final Cut, Premiere) do not export WebM natively.

Dimensioni e pesi tipici

Short web clip (1080p VP9, 1 min)

15-30 MB

YouTube 1080p AV1 (1 min)

12-20 MB

Animated sticker (VP9, transparent)

200-800 KB

Specifiche tecniche

MIME type: video/webm
Extension: .webm
Container: Matroska subset
Video codecs: VP8, VP9, AV1
Audio codecs: Vorbis, Opus

CONVERTI DA
WEBM

webm jpg webm png webm webp webm gif webm bmp webm mp4 webm mov webm mkv webm avi webm flv webm wmv webm 3gp webm mp3 webm wav webm flac webm aac webm m4a webm ogg webm opus webm wma webm ogv webm m4v webm ts webm dv webm m2v webm mjpeg webm nut webm y4m

CONVERTI IN
WEBM

mp4 webm avi webm mov webm mkv webm flv webm wmv webm mpeg webm 3gp webm ogv webm vob webm m4v webm ts webm m2ts webm mts webm mpg webm asf webm dv webm f4v webm h264 webm h265 webm m2v webm mjpeg webm mxf webm rm webm rmvb webm divx webm nut webm y4m webm swf webm gif webm

Casi d'uso comuni

HTML5 video, web streaming, browser-native video playback.