{"id":964,"date":"2026-07-13T15:13:00","date_gmt":"2026-07-13T19:13:00","guid":{"rendered":"https:\/\/www.xconvert.com\/blog\/?p=964"},"modified":"2026-06-27T01:51:06","modified_gmt":"2026-06-27T05:51:06","slug":"convert-avi-to-mp4","status":"publish","type":"post","link":"https:\/\/www.xconvert.com\/blog\/convert-avi-to-mp4","title":{"rendered":"How to Convert AVI to MP4 (and Why AVI Files Are Huge)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">You found an old <code>.avi<\/code> clip \u2014 a camcorder transfer, a screen recording, or a download from years ago \u2014 and two things are true: it\u2019s surprisingly <strong>huge<\/strong>, and it won\u2019t play in a web browser, on your phone, or in most modern apps. Both problems share one cause and one fix. AVI is a 1992 Microsoft container that usually wraps an old, lightly-compressed codec, so the files are big and barely supported. Converting to <strong>MP4 (H.264)<\/strong> re-encodes the video with a modern codec \u2014 typically far smaller <em>and<\/em> playable essentially everywhere. We verified the AVI history, codec facts, and support numbers against Microsoft\u2019s own docs, MDN, and caniuse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Quick answer:<\/strong> <strong>AVI files are large because the format is old (Microsoft, 1992) and usually holds a dated, weakly-compressed codec<\/strong> \u2014 DivX\/Xvid (MPEG-4 ASP), Indeo, Cinepak, Microsoft Video 1, or even uncompressed video. AVI also can\u2019t use modern compression tricks like B-frames and adds per-file overhead. <strong>Convert to MP4 with H.264<\/strong> to get a much smaller file that plays in every browser, on iPhone and Android, and in modern editors. Unlike MOV\u2192MP4 (which can sometimes just re-wrap the same codec), <strong>AVI\u2192MP4 almost always requires a real re-encode<\/strong>, so allow a little processing time.<\/p>\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-big\">Why AVI files are so big<\/a><\/li><li><a href=\"#compatibility\">Why AVI won\u2019t play on the web or your phone<\/a><\/li><li><a href=\"#mp4-fixes\">What MP4 fixes \u2014 and the one trade-off<\/a><\/li><li><a href=\"#reencode\">AVI to MP4 is a re-encode, not a re-wrap<\/a><\/li><li><a href=\"#tool\">Convert AVI to MP4 on xconvert<\/a><\/li><li><a href=\"#faq\">FAQ<\/a><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"why-big\">Why AVI files are so big<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">AVI \u2014 <strong>Audio Video Interleave<\/strong> \u2014 was introduced by <strong>Microsoft in November 1992<\/strong> as part of <em>Video for Windows<\/em>, its answer to Apple\u2019s QuickTime. It\u2019s a <a href=\"https:\/\/learn.microsoft.com\/en-us\/windows\/win32\/directshow\/avi-riff-file-reference\">RIFF<\/a>-based container: a header list, an interleaved stream of video frames and audio samples, and an optional index. That design was fine for 1992 CD-ROM playback, but it\u2019s the reason your files are bloated today.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Three things make AVI files large:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>The codec inside is usually old and weakly compressed.<\/strong> AVI is just a wrapper \u2014 the size depends on the video codec it holds. In practice that\u2019s commonly <strong>MPEG-4 ASP<\/strong> (DivX or Xvid), or even older codecs like <strong>Indeo, Cinepak, run-length encoding, Microsoft Video 1<\/strong>, or <strong>fully uncompressed<\/strong> frames. None compress nearly as efficiently as modern H.264. Uncompressed AVI is the extreme case \u2014 historically, ~30 seconds of uncompressed Super VGA video filled an entire 1992-era CD-ROM (~680 MB).<\/li><li><strong>AVI can\u2019t use the compression tricks modern codecs rely on.<\/strong> Per the reference summary, AVI \u201cwas not intended to contain video using any compression technique that requires access to future video frame data beyond the current frame (B-frame).\u201d B-frames are a major part of how H.264 shrinks files; AVI\u2019s design effectively rules them out.<\/li><li><strong>Container overhead.<\/strong> AVI carries roughly <strong>5 MB of overhead per hour<\/strong> at typical standard-definition rates, and can\u2019t reliably store some variable-bitrate audio. Small on its own, but one more way the format wastes space versus MP4.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The headline: <strong>a large AVI is large because of what\u2019s inside it and how the container works \u2014 not because the video is inherently high quality.<\/strong> Re-encoding to H.264 routinely shrinks these files dramatically at the same visual quality.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"compatibility\">Why AVI won\u2019t play on the web or your phone<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The second AVI problem is support. <strong>No major web browser plays <code>.avi<\/code> natively<\/strong> in an HTML5 <code>&lt;video&gt;<\/code> element. MDN\u2019s container guide doesn\u2019t even document AVI as a web format \u2014 it\u2019s mentioned only as a legacy QuickTime fallback. Microsoft itself has moved on: the AVI\/DirectShow APIs are flagged as a <strong>legacy feature<\/strong>, superseded by newer Media Foundation pipelines.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Phones are no friendlier. iOS has never natively played <code>.avi<\/code>, and Android support is inconsistent and device-dependent. So an AVI typically forces you into a desktop player like VLC \u2014 exactly the friction you don\u2019t want when sharing a clip.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MP4 is the opposite. Here\u2019s the contrast:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Where it needs to play<\/th><th>AVI<\/th><th>MP4 (H.264 \/ AAC)<\/th><\/tr><\/thead><tbody><tr><td>Web browsers (<code>&lt;video&gt;<\/code>)<\/td><td>Not natively supported<\/td><td><strong>Yes \u2014 ~96.7% global support<\/strong><\/td><\/tr><tr><td>Chrome \/ Edge \/ Firefox \/ Safari<\/td><td>No<\/td><td><strong>Yes, all of them<\/strong><\/td><\/tr><tr><td>iPhone \/ iPad<\/td><td>No<\/td><td><strong>Yes, native<\/strong><\/td><\/tr><tr><td>Android<\/td><td>Patchy \/ device-dependent<\/td><td><strong>Yes, native<\/strong><\/td><\/tr><tr><td>Modern video editors &amp; social apps<\/td><td>Often needs conversion<\/td><td><strong>Yes<\/strong><\/td><\/tr><tr><td>Desktop player (VLC, etc.)<\/td><td>Yes<\/td><td>Yes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">That ~96.7% figure is the <a href=\"https:\/\/caniuse.com\/mpeg4\">caniuse<\/a> global support for the MPEG-4\/H.264 video format \u2014 it plays in every current major browser and on iOS and Android. AVI simply has no equivalent.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"mp4-fixes\">What MP4 fixes \u2014 and the one trade-off<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Converting AVI \u2192 MP4 with <strong>H.264<\/strong> video and <strong>AAC<\/strong> audio gives you the modern default. MDN lists MP4 as broadly supported, holding exactly these mainstream codecs. You get:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Much smaller files<\/strong> \u2014 H.264 compresses far more efficiently than the old codecs typically found in AVI, so the same footage usually drops a lot in size at equal quality.<\/li><li><strong>Universal playback<\/strong> \u2014 browser, iPhone, Android, editors, messaging apps.<\/li><li><strong>A future-proof container<\/strong> \u2014 MP4 also supports newer codecs (H.265\/HEVC, AV1) if you later want even smaller files for a controlled audience. (See <a href=\"https:\/\/www.xconvert.com\/blog\/h264-vs-h265-which-to-use\/\">H.264 vs H.265<\/a> for when each makes sense.)<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The one honest trade-off: because this is a <strong>re-encode<\/strong> (see the next section), you\u2019re decoding the old codec and re-compressing with H.264, which loses some quality in principle. In practice, when the source is an old DivX\/Xvid or uncompressed AVI, a high-quality H.264 setting produces output that\u2019s visually very close to the original at a fraction of the size \u2014 the loss is hard to notice.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"reencode\">AVI to MP4 is a re-encode, not a re-wrap<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is the key difference from a job like <a href=\"https:\/\/www.xconvert.com\/blog\/convert-mov-to-mp4-windows-mac\/\">MOV \u2192 MP4<\/a>. MOV and MP4 are close cousins \u2014 both descend from the same ISO base media file format \u2014 so a MOV that already holds H.264 + AAC can often be <strong>re-wrapped<\/strong> (remuxed) into MP4 with no quality loss and almost instantly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AVI is different. The codec inside an AVI (DivX, Xvid, Indeo, Cinepak, uncompressed\u2026) is almost never H.264, and MP4 won\u2019t hold those old codecs. So the converter must <strong>decode the old video and re-encode it as H.264<\/strong> \u2014 a genuine transcode. Practical consequences:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>It takes longer<\/strong> than a remux, because every frame is re-compressed. (Running it on a server, as xconvert does, keeps that load off your own machine.)<\/li><li><strong>Quality is governed by your settings<\/strong>, not just copied \u2014 so a sensible quality preset matters, and it\u2019s why the size win is so large: you\u2019re swapping a weak codec for an efficient one.<\/li><li><strong>You can\u2019t avoid it.<\/strong> Any \u201cAVI to MP4\u201d tool that finishes instantly is either rejecting the file or producing something most players won\u2019t open. A real re-encode is the correct behavior.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"tool\">Convert AVI to MP4 on xconvert<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/www.xconvert.com\/convert-avi-to-mp4\">xconvert AVI to MP4 converter<\/a> handles the re-encode for you, with sensible defaults and optional control over quality and size:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"1250\" src=\"https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-44.png\" alt=\"Quality Preset defaults to Very High (Recommended) \u2014 keep it for a clean H.264 re-encode\" class=\"wp-image-1277\" srcset=\"https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-44.png 1600w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-44-300x234.png 300w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-44-1024x800.png 1024w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-44-768x600.png 768w, https:\/\/www.xconvert.com\/blog\/wp-content\/uploads\/2026\/06\/step-01-control-44-1536x1200.png 1536w\" sizes=\"auto, (max-width: 1600px) 100vw, 1600px\" \/><\/figure>\n\n\n\n<ol class=\"wp-block-list\"><li>Open <a href=\"https:\/\/www.xconvert.com\/convert-avi-to-mp4\">xconvert.com\/convert-avi-to-mp4<\/a> and click <strong>Upload<\/strong> (the <strong>Add files<\/strong> button) to add your <code>.avi<\/code> \u2014 from your computer, Google Drive, or Dropbox.<\/li><li>For most files, the defaults are already tuned \u2014 the page notes <em>\u201cOur defaults are optimized for the best results.\u201d<\/em> To adjust, open <strong>Advanced Options<\/strong> (the gear).<\/li><li>Set the <strong>Quality Preset<\/strong> \u2014 it defaults to <strong>Very High (Recommended)<\/strong>. For finer control you can switch the encoding mode to <strong>Constant Bitrate<\/strong>, <strong>Variable Bitrate<\/strong>, or <strong>Constant Quality<\/strong>, or pick <strong>Specific file size<\/strong> to target an exact output size in MB.<\/li><li>Optionally adjust <strong>Video resolution<\/strong> (it stays on <strong>Keep original<\/strong> by default) or <strong>Trim<\/strong> the clip to a <strong>Time Range<\/strong>.<\/li><li>Click <strong>Convert<\/strong>, then download your MP4. Because this is a true re-encode, allow a little extra time on longer clips.<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Your file uploads over an encrypted connection, is processed on our servers, and is automatically deleted a few hours later. Nothing stays around.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your goal is mainly to <em>shrink<\/em> a video that\u2019s already MP4, use the <a href=\"https:\/\/www.xconvert.com\/compress-mp4\">MP4 compressor<\/a> instead; and for the iPhone\/Mac <code>.mov<\/code> case, see <a href=\"https:\/\/www.xconvert.com\/blog\/convert-mov-to-mp4-windows-mac\/\">Convert MOV to MP4<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"faq\">FAQ<\/h2>\n\n\n\n<h5 class=\"wp-block-heading\">Why are AVI files so big?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Because AVI is a <strong>1992 Microsoft container<\/strong> that usually holds an <strong>old, lightly-compressed codec<\/strong> \u2014 DivX\/Xvid (MPEG-4 ASP), Indeo, Cinepak, Microsoft Video 1, or uncompressed video \u2014 and its design can\u2019t use modern compression features like B-frames. The size comes from the dated codec inside, not from superior quality. Re-encoding to H.264 in an MP4 usually shrinks the file substantially at the same visual quality.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Does converting AVI to MP4 reduce quality?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">It\u2019s a re-encode, so there\u2019s some theoretical loss \u2014 but with a <strong>high quality preset it\u2019s usually imperceptible<\/strong>, especially when the source is an old DivX\/Xvid or uncompressed AVI. You\u2019re trading a weak codec for the far more efficient H.264, which is why the file gets much smaller while still looking close to the original.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Will AVI to MP4 make the file smaller?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Almost always, yes.<\/strong> The old codecs typically wrapped in AVI compress poorly compared to H.264, so re-encoding to MP4 usually produces a much smaller file at equivalent quality \u2014 uncompressed AVI sees the biggest reduction. Use the <strong>Specific file size<\/strong> option to hit an exact target.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Why won\u2019t my AVI file play in my browser or on my phone?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>No major browser plays <code>.avi<\/code> natively<\/strong> in HTML5 video, and iOS\/Android support is absent or inconsistent \u2014 AVI is a legacy desktop format. MP4 with H.264, by contrast, has <strong>~96.7% global browser support<\/strong> and plays natively on iPhone and Android.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">Is AVI to MP4 the same kind of conversion as MOV to MP4?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">No. MOV and MP4 share the same underlying file format, so a MOV holding H.264 can often be <strong>re-wrapped<\/strong> into MP4 instantly with no quality loss. AVI holds older codecs MP4 can\u2019t carry, so AVI\u2192MP4 requires a <strong>full re-encode<\/strong> \u2014 it takes longer but is the correct, unavoidable behavior.<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">What\u2019s the best codec to convert AVI to?<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>H.264 (with AAC audio)<\/strong> for maximum compatibility \u2014 it plays everywhere and is the modern default. If your audience is on recent Apple devices or hardware you control and you want even smaller files, H.265\/HEVC is an option; see <a href=\"https:\/\/www.xconvert.com\/blog\/h264-vs-h265-which-to-use\/\">H.264 vs H.265<\/a> to decide.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sources<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Last verified 2026-06-25.<\/em><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/learn.microsoft.com\/en-us\/windows\/win32\/directshow\/avi-riff-file-reference\">Microsoft Learn \u2014 AVI RIFF File Reference<\/a> \u2014 AVI is Microsoft\u2019s RIFF-based container; the DirectShow\/AVI APIs are flagged as a legacy feature.<\/li><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Audio_Video_Interleave\">Wikipedia \u2014 Audio Video Interleave<\/a> \u2014 AVI introduced by Microsoft November 1992 (Video for Windows); commonly wraps MPEG-4 ASP\/DivX\/Xvid, Indeo, Cinepak, Microsoft Video 1, or uncompressed; no B-frames; ~5 MB\/hour overhead; VBR-audio limitations.<\/li><li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Video_for_Windows\">Microsoft Learn \u2014 History of Microsoft 1992 \/ Video for Windows<\/a> \u2014 Video for Windows (and AVI) released Nov 1992 as a response to Apple QuickTime.<\/li><li><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/Media\/Formats\/Containers\">MDN \u2014 Media container formats<\/a> \u2014 MP4 is broadly supported across all browsers and holds H.264\/AAC; AVI appears only as a legacy fallback, not a web format.<\/li><li><a href=\"https:\/\/caniuse.com\/mpeg4\">caniuse \u2014 MPEG-4 \/ H.264 video format<\/a> \u2014 ~96.7% global support; plays in all major browsers and on iOS and Android.<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>AVI files are big and barely play anywhere. Here&#8217;s why, and how to convert AVI to MP4 (H.264) for a far smaller, universally compatible file.<\/p>\n","protected":false},"author":4,"featured_media":1279,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,14],"tags":[],"class_list":["post-964","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 AVI to MP4 (and Why AVI Files Are Huge)<\/title>\n<meta name=\"description\" content=\"AVI files are big and barely play anywhere. 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