{"id":1512,"date":"2026-09-02T15:13:00","date_gmt":"2026-09-02T19:13:00","guid":{"rendered":"https:\/\/www.xconvert.com\/blog\/?p=1512"},"modified":"2026-08-31T17:09:54","modified_gmt":"2026-08-31T21:09:54","slug":"convert-mov-mp4-to-webm","status":"publish","type":"post","link":"https:\/\/www.xconvert.com\/blog\/convert-mov-mp4-to-webm","title":{"rendered":"How to Convert MOV or MP4 to WebM for Smaller Web Video"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Your phone, camera, or screen recorder hands you a <code>.mov<\/code> or <code>.mp4<\/code> \u2014 almost always H.264 or HEVC inside. That\u2019s fine for sharing, but the moment you self-host that clip on a web page \u2014 a hero-section loop, a hover preview, a product demo in a <code>&lt;video&gt;<\/code> tag \u2014 you\u2019re shipping more megabytes than you need to, in a codec that carries patent licensing. WebM is the format Google designed for exactly this job. This guide covers why WebM wins for web embeds, the Safari caveat to handle, the settings that matter, and when to keep MP4. We verified the browser-support state on caniuse, the size claims against Google\u2019s own VP9 documentation, and every setting against the live converter.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Quick answer:<\/strong> For video embedded on your own site \u2014 self-hosted <code>&lt;video&gt;<\/code>, hero loops, hover previews \u2014 convert MOV or MP4 to <strong>WebM with the VP9 codec<\/strong> (the default output on xconvert). WebM\u2019s codecs are <strong>royalty-free<\/strong>, and VP9 output is <strong>typically smaller than an H.264 original at comparable web quality<\/strong> \u2014 Google\u2019s VP9 documentation cites bit-rate reductions of as much as 50%. Every modern browser plays WebM, but <strong>full Safari support only arrived in Safari 16 (macOS) and iOS 17.4<\/strong>, so keep an MP4 <code>&lt;source&gt;<\/code> fallback. Keep MP4 as the primary format for email, offline sharing, and unknown or older devices.<\/p><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Jump to a section<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"#why-webm\">Why WebM is the web-embed format<\/a><\/li><li><a href=\"#browser-support\">Browser support and the Safari caveat<\/a><\/li><li><a href=\"#settings\">Settings that matter (codec, quality, size)<\/a><\/li><li><a href=\"#keep-mp4\">When to keep MP4 instead<\/a><\/li><li><a href=\"#tool\">Convert MOV or MP4 to WebM on xconvert<\/a><\/li><li><a href=\"#faq\">FAQ<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"why-webm\">Why WebM is the web-embed format<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The WebM Project describes the format in one line: \u201cWebM is an open, royalty-free, media file format designed for the web.\u201d Technically it\u2019s a Matroska-based container that pairs <strong>VP8 or VP9 video with Vorbis or Opus audio<\/strong> \u2014 those four codecs are what compliant WebM implementations are required to support, per MDN \u2014 and the newer <strong>AV1<\/strong> codec can be packaged in WebM as well.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Three properties make it the default choice for video you host yourself:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Royalty-free codecs.<\/strong> MDN\u2019s codec guide describes VP9 as \u201copen and free of royalties and any other licensing requirements,\u201d while H.264 (AVC) and H.265 (HEVC) \u2014 what MOV and MP4 files from cameras and phones almost always contain \u2014 are \u201cproprietary with numerous patents,\u201d with commercial use subject to patent-pool licensing. For a commercial site or app, the open codec removes a whole category of licensing questions.<\/li><li><strong>Smaller files at web quality.<\/strong> Google\u2019s VP9 overview states that VP9 \u201ccan reduce video bit rates by as much as 50% compared with other known codecs\u201d \u2014 it\u2019s the codec YouTube uses for exactly this reason. Treat 50% as the favourable end, not a guarantee \u2014 the saving depends on content, source codec, and quality target \u2014 but at typical web-quality settings a VP9 WebM comes out meaningfully smaller than the H.264 original, and that saving is paid back on every single page view.<\/li><li><strong>Built for the <code>&lt;video&gt;<\/code> tag.<\/strong> WebM exists because the web needed an open format for HTML5 video. Every modern browser ships a decoder (details below), and <code>type=&quot;video\/webm&quot;<\/code> in a <code>&lt;source&gt;<\/code> element is universally understood.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This article is the conversion how-to; if you\u2019re still deciding <em>whether<\/em> WebM or MP4 is the right distribution format for your case, the full head-to-head is in <a href=\"https:\/\/www.xconvert.com\/blog\/mp4-vs-webm-web-video\">MP4 vs WebM for web video<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"browser-support\">Browser support and the Safari caveat<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Per caniuse, WebM sits at roughly <strong>96% global browser support<\/strong> (mid-2026). The support history matters, though, because Safari was very late to the party:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Browser<\/th><th>WebM support (per caniuse)<\/th><\/tr><\/thead><tbody><tr><td>Chrome<\/td><td>Full since version 25<\/td><\/tr><tr><td>Firefox<\/td><td>Full since version 28<\/td><\/tr><tr><td>Edge (Chromium)<\/td><td>Full since version 79<\/td><\/tr><tr><td>Opera<\/td><td>Full since version 16<\/td><\/tr><tr><td>Safari (macOS)<\/td><td><strong>Full since Safari 16.0<\/strong>; 14.1\u201315.6 supported it only on macOS 11.3 Big Sur or later; earlier versions partial at best<\/td><\/tr><tr><td>Safari (iOS)<\/td><td><strong>Full since iOS 17.4<\/strong>; earlier versions partial (largely limited to VP8\/VP9 in WebRTC)<\/td><\/tr><tr><td>Chrome \/ Firefox \/ Samsung Internet on Android<\/td><td>Supported<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">So the honest summary is: <strong>every current browser plays WebM, but visitors on older Safari \u2014 a Mac that can\u2019t update past an old macOS, an iPhone stuck below iOS 17.4 \u2014 may not.<\/strong> The web platform has a clean answer, and it\u2019s the pattern MDN documents for the <code>&lt;video&gt;<\/code> element: \u201cyou can provide multiple sources inside nested <code>&lt;source&gt;<\/code> elements, and the browser will then use the first one it understands.\u201d<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;video controls preload=&quot;metadata&quot; width=&quot;640&quot;&gt;\n  &lt;source src=&quot;demo.webm&quot; type=&quot;video\/webm&quot; \/&gt;\n  &lt;source src=&quot;demo.mp4&quot; type=&quot;video\/mp4&quot; \/&gt;\n  Your browser doesn't play embedded video \u2014\n  &lt;a href=&quot;demo.mp4&quot; download&gt;download the MP4&lt;\/a&gt; instead.\n&lt;\/video&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">List the WebM first so capable browsers (the ~96%) take the small file, and the MP4 second as the catch-all. You already have the MP4 or MOV source, so the fallback costs you nothing but storage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For hero-section background loops there\u2019s one more platform rule: browsers block autoplaying video with audible sound. MDN\u2019s autoplay guide notes that autoplay blocking \u201cis not applied to <code>&lt;video&gt;<\/code> elements when the source media does not have an audio track, or if the audio track is muted,\u201d and that the <code>playsinline<\/code> attribute \u201cis required for autoplay in Safari.\u201d The standard hero-loop markup is therefore:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;video autoplay muted loop playsinline&gt;\n  &lt;source src=&quot;hero.webm&quot; type=&quot;video\/webm&quot; \/&gt;\n  &lt;source src=&quot;hero.mp4&quot; type=&quot;video\/mp4&quot; \/&gt;\n&lt;\/video&gt;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"settings\">Settings that matter (codec, quality, size)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Three decisions determine how small and how compatible your WebM comes out. (These map directly onto the controls on the converter page \u2014 see the <a href=\"#tool\">steps below<\/a>.)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>1. Codec: VP9 is the sweet spot.<\/strong> On xconvert, WebM output defaults to <strong>VP9<\/strong>, and that\u2019s the right call for almost everyone: modern-browser support and the efficiency gains above. <strong>AV1<\/strong> produces even smaller files, but encoding is slower and hardware decoding only exists on recent devices \u2014 pick it when your audience skews modern and every kilobyte counts. <strong>VP8<\/strong> is the legacy option for very old devices; it produces larger files than VP9, so only choose it if you know you need it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2. Quality: use a preset, a CRF, or a target size.<\/strong> The converter\u2019s default (<strong>Quality Preset<\/strong> \u2192 \u201cVery High (Recommended)\u201d) is tuned for near-source quality. If you want explicit control, <strong>Constant Quality<\/strong> mode uses a CRF scale where lower numbers mean higher quality \u2014 Google\u2019s VP9 encoding guide recommends <strong>CRF 31 for 1080p, 32 for 720p, 33\u201334 for 480p, and 36 for 360p<\/strong> as good web-quality targets. And if the file must land under a hard budget, <strong>Specific file size<\/strong> lets the encoder work backwards from an exact output size in MB.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>3. Resolution and trim: the quiet giants.<\/strong> Re-encoding 4K camera footage into a 4K hero loop wastes everyone\u2019s bandwidth \u2014 1080p is plenty for a full-width background, and hover previews are often fine at 480\u2013720p. Halving dimensions roughly quarters the pixels the encoder has to spend bits on. Likewise, a hero loop only needs the few seconds that actually loop: trim to that range as part of the conversion instead of shipping the whole clip.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you\u2019ve already got a WebM and it\u2019s still too heavy for the page, that\u2019s a compression job rather than a conversion job \u2014 see <a href=\"https:\/\/www.xconvert.com\/blog\/webm-compression-self-hosted-video\">WebM compression for self-hosted video<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"keep-mp4\">When to keep MP4 instead<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">WebM is a <em>distribution format for the web you control<\/em>. Outside that context, MP4 (H.264) is still the safer default:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Email and messaging.<\/strong> A <code>.webm<\/code> attachment opens in whatever player the recipient happens to have \u2014 or doesn\u2019t. An H.264 MP4 opens in the default player on effectively every modern OS and phone.<\/li><li><strong>Offline sharing and unknown devices.<\/strong> USB sticks, smart TVs, in-car players, a client whose setup you know nothing about: MP4 is the format least likely to bounce.<\/li><li><strong>Editing workflows.<\/strong> Editors ingest camera-native MOV\/MP4 happily; WebM support in editing software is patchier. Convert for delivery, not before the edit.<\/li><li><strong>Old-Safari-heavy audiences without a fallback.<\/strong> If you can\u2019t (or won\u2019t) ship the two-<code>&lt;source&gt;<\/code> pattern above \u2014 say, a platform that only accepts one file \u2014 MP4 reaches the stragglers.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The rule of thumb mirrors the codec world\u2019s \u201cship H.264, store H.265\u201d: <strong>embed WebM on your own pages, hand MP4 to everything else.<\/strong> The deeper trade-offs live in <a href=\"https:\/\/www.xconvert.com\/blog\/mp4-vs-webm-web-video\">MP4 vs WebM for web video<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"tool\">Convert MOV or MP4 to WebM on xconvert<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/www.xconvert.com\/convert-mov-to-webm\">xconvert MOV to WebM converter<\/a> handles iPhone recordings, QuickTime exports, and screen captures; for MP4 sources use the <a href=\"https:\/\/www.xconvert.com\/convert-mp4-to-webm\">MP4 to WebM converter<\/a> \u2014 the options are identical:<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>Click <strong>Upload<\/strong> and add your video \u2014 <strong>From my Computer<\/strong>, <strong>From Google Drive<\/strong>, or <strong>From Dropbox<\/strong> \u2014 or just drag and drop it onto the page. Batch uploads work if you\u2019re converting a folder of clips.<\/li><li>Set quality under <strong>File Compression<\/strong>: the default <strong>Quality Preset<\/strong> (\u201cVery High (Recommended)\u201d) gives near-source quality, or switch to <strong>Constant Quality<\/strong> (CRF \u2014 try Google\u2019s recommended 31 for 1080p) or <strong>Specific file size<\/strong> for a hard MB budget.<\/li><li>Optionally downscale under <strong>Video resolution<\/strong> (<strong>Keep original<\/strong>, <strong>Preset Resolutions<\/strong>, <strong>Resolution Percentage<\/strong>, or exact <strong>Width x Height<\/strong>) and cut a loop segment under <strong>Trim<\/strong> \u2192 <strong>Time Range<\/strong>.<\/li><li>To change codec, click <strong>Show All Options<\/strong> in the Advanced Options panel \u2014 the <strong>Video Codec<\/strong> selector appears, defaulting to <strong>VP9<\/strong> for WebM output; switch to AV1 (smallest, modern devices) or VP8 (legacy) if your audience calls for it.<\/li><li>Click <strong>Convert<\/strong>, then download the finished <code>.webm<\/code>.<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Your video is uploaded over an encrypted connection, is processed on our servers and deleted automatically a few hours later \u2014 nothing stays around.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">FAQ<\/h2>\n\n\n\n<h5 class=\"wp-block-heading\">Does converting MOV or MP4 to WebM lose quality?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Slightly, in principle: H.264\/HEVC and VP9 are different codecs, so this is a re-encode, and <strong>a small generational loss is unavoidable<\/strong>. At sensible settings \u2014 the \u201cVery High\u201d preset, or CRF around Google\u2019s recommended values \u2014 the difference is generally not visible in normal playback. Quality only becomes an issue if you push the bitrate or CRF hard to hit a very small size.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Can Safari users play my WebM video?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Current Safari, yes: full WebM support shipped in Safari 16 on macOS and iOS 17.4 on iPhone\/iPad<\/strong> (per caniuse; earlier versions had partial support at best). Visitors on older Safari are exactly why you list an MP4 as the second <code>&lt;source&gt;<\/code> in your <code>&lt;video&gt;<\/code> tag \u2014 the browser picks the first format it understands, so everyone gets <em>something<\/em> that plays.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Is WebM actually smaller than MP4?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">It\u2019s the codecs, not the containers, that set the size \u2014 and camera MOV\/MP4 files are almost always H.264 or HEVC. Compared with H.264, <strong>Google\u2019s VP9 documentation cites bit-rate reductions of as much as 50% at comparable quality<\/strong>; real-world savings vary with content and settings, but at web-quality targets the WebM typically comes out meaningfully smaller. Converting between containers with the same codec inside wouldn\u2019t change the size much \u2014 the win comes from re-encoding into VP9 or AV1.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Should I pick VP9, AV1, or VP8 for the WebM?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>VP9 \u2014 the default \u2014 is right for almost everything<\/strong>: the best balance of efficiency and modern-browser support. Choose <strong>AV1<\/strong> for the smallest possible files when your audience is on recent devices, and accept the slower encode. Choose <strong>VP8<\/strong> only for deliberately legacy-friendly output; its files are larger than VP9\u2019s.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">How do I make a WebM hero video autoplay?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Use <code>&lt;video autoplay muted loop playsinline&gt;<\/code>. Browsers block autoplay with audible sound; per MDN, autoplay blocking doesn\u2019t apply <strong>when the video has no audio track or is muted<\/strong>, and Safari additionally <strong>requires the <code>playsinline<\/code> attribute<\/strong> for inline autoplay. Without <code>muted<\/code>, your hero loop simply won\u2019t start on most browsers.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">What happens to the audio track?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">WebM doesn\u2019t carry AAC (the usual MOV\/MP4 audio); its audio codecs are <strong>Opus and Vorbis<\/strong>, so the audio is re-encoded during conversion, not dropped \u2014 on xconvert the WebM default is Opus. For muted hero loops and hover previews this is academic, since the track is never heard.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Does WebM support transparent (alpha) video?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">The format does \u2014 VP9 supports an alpha channel, and it plays in Chrome, Edge, Firefox, and Opera. The catch, straight from MDN\u2019s codec guide: <strong>\u201cSafari does not support alpha transparency\u201d<\/strong> in VP9. Sites that need transparent video everywhere typically ship an HEVC-with-alpha MP4 as the Safari-side fallback. If transparency matters to your embed, test in Safari before shipping.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sources<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Last verified 2026-07-16.<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.webmproject.org\/about\/\">The WebM Project \u2014 About<\/a> \u2014 \u201cWebM is an open, royalty-free, media file format designed for the web\u201d; VP8\/VP9 video with Vorbis\/Opus audio.<\/li><li><a href=\"https:\/\/developers.google.com\/media\/vp9\">Google Developers \u2014 VP9 Overview<\/a> \u2014 \u201cVP9 can reduce video bit rates by as much as 50% compared with other known codecs\u201d; VP9\u2019s use by YouTube.<\/li><li><a href=\"https:\/\/developers.google.com\/media\/vp9\/settings\/vod\">Google Developers \u2014 VP9 VOD encoding settings<\/a> \u2014 recommended CRF values per resolution (31 @ 1080p, 32 @ 720p, 33\u201334 @ 480p, 36 @ 360p).<\/li><li><a href=\"https:\/\/caniuse.com\/webm\">caniuse \u2014 WebM video format<\/a> \u2014 support matrix: Chrome 25+, Firefox 28+, Edge 79+, Opera 16+, Safari 16.0+ (14.1\u201315.6 gated on macOS 11.3+), iOS Safari 17.4+; ~96% global support.<\/li><li><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/HTML\/Reference\/Elements\/video\">MDN \u2014 The <code>&lt;video&gt;<\/code> element<\/a> \u2014 multiple <code>&lt;source&gt;<\/code> fallback: \u201cthe browser will then use the first one it understands.\u201d<\/li><li><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Media\/Guides\/Formats\/Containers\">MDN \u2014 Media container formats<\/a> \u2014 WebM is Matroska-based; required codecs VP8\/VP9 + Vorbis\/Opus; AV1 supported in WebM.<\/li><li><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Media\/Guides\/Formats\/Video_codecs\">MDN \u2014 Web video codec guide<\/a> \u2014 VP9 \u201copen and free of royalties\u201d; H.264\/HEVC proprietary licensing; Safari\u2019s lack of VP9 alpha transparency.<\/li><li><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Media\/Guides\/Autoplay\">MDN \u2014 Autoplay guide for media<\/a> \u2014 muted media exempt from autoplay blocking; <code>playsinline<\/code> required for autoplay in Safari.<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Convert MOV or MP4 to WebM (VP9) for faster pages: smaller files, royalty-free codecs, the Safari caveat, and the settings that keep quality intact.<\/p>\n","protected":false},"author":4,"featured_media":1511,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,14],"tags":[],"class_list":["post-1512","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-to-guides","category-tools"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Convert MOV or MP4 to WebM for Smaller Web 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