Xvid to WebM

How to Convert Xvid to WebM Online

1. Upload Your Xvid File: Drag and drop, or click "+ Add Files" to select an Xvid-encoded video (typically delivered inside an AVI container — .avi or .divx). Batch is supported, so queue several rips and convert them in one pass.
2. Pick Quality Preset and Codec: Open File Compression and choose Quality Preset (Highest, Very High, High, Medium, Low, Lowest). For finer control, switch to Constant Quality (CRF) — VP9/AV1 use 0–63 (lower = sharper; 30–35 is a sensible web target), or use Variable Bitrate / Constant Bitrate / Specific file size when you need a hard size cap. The default video codec is VP9; AV1 and VP8 are also valid WebM choices.
3. Resize, Trim, or Restyle (Optional): Under Video resolution, keep original, choose a Preset Resolution (2160p, 1080p, 720p, 480p, 360p), set Width × Height, or scale by Resolution Percentage. For a clip, set Trim to Time Range and enter start + duration. Background color and audio codec (Opus is the WebM default; Vorbis also works) are exposed under their own dropdowns.
4. Convert and Download: Click Convert. Files process in your browser session — no sign-up, no watermark, no upload of your original to a third-party storage tier.

Why Convert Xvid to WebM?

Xvid is an MPEG-4 Part 2 ASP video codec, open-source under GPL since 2001, and almost always wrapped in an AVI container. It served as the de-facto codec for DVD rips and early peer-to-peer video for nearly a decade, but the web has moved on. Browsers don't ship Xvid/AVI playback — Chrome, Firefox, Safari, and Edge all play WebM directly via <video>, while AVI requires a download or a desktop player. WebM is the modern, royalty-free, Matroska-based container that Google built for HTML5 and that YouTube, Twitter, and most streaming services have settled on for web delivery.

• HTML5 native playback — WebM plays in Chrome 25+, Firefox 28+, Edge 79+, and Safari 16+ on macOS / 17.4+ on iOS without plugins. Xvid-in-AVI requires a desktop player or a third-party extension on every device.
• 30–50% smaller files at the same quality — VP9 (the WebM default) is engineered to halve VP8's bitrate at the same perceptual quality, and Xvid's MPEG-4 Part 2 lineage is older and less efficient still. A 2 GB AVI rip routinely lands at 700–900 MB as VP9 WebM with no visible quality loss.
• Royalty-free for distribution — VP8, VP9, and Vorbis/Opus carry no license fees from Google, so embedding WebM on a commercial site doesn't trigger MPEG-LA-style patent royalties the way H.264 deployments historically did.
• Higher resolution headroom — Xvid was designed in the SD/early-HD era; VP9 supports 4K and 8K cleanly and AV1 pushes that further. Converting now also lets you scale down legacy 480p / 576p captures to a clean 720p web preset.
• Smaller archive footprint — A NAS full of AVI rips re-encoded to VP9 WebM typically reclaims 40–60% of the disk space, even before you touch resolution.
• Editor and CMS friendliness — WordPress, Ghost, Webflow, and most modern CMSs accept WebM uploads natively for <video> embeds; AVI uploads usually need server-side transcoding first.

Xvid (AVI) vs WebM — Format Comparison

Codec Inside WebM — Which One to Pick

CRF Quick Guide for VP9 / AV1

Lower CRF means a higher bitrate and a larger file. The VP9 codec uses a 0–63 scale; H.264/H.265 use a different 0–51 scale, so don't carry the same number across.

Frequently Asked Questions

Will my Xvid AVI file play in a browser without conversion?

No. None of the major browsers (Chrome, Firefox, Safari, Edge) ship the Xvid / MPEG-4 Part 2 decoder for HTML5 <video>, and AVI is not a supported container. Hosting an .avi file behind a <video> tag prompts a download in most browsers rather than playback. Converting to WebM (or MP4/H.264) is the standard fix.

Should I pick VP9, VP8, or AV1 inside WebM?

VP9 is the default for almost every modern conversion: hardware decoding is widespread (Intel from Kaby Lake / 7th-gen, AMD from Polaris, most ARM SoCs), it's 30–50% smaller than VP8 at the same quality, and it's universally supported in WebM-capable browsers. Choose VP8 only if you specifically need the lowest-CPU encode for a legacy device. Choose AV1 if storage/bandwidth dominate cost and you can absorb the slower encode — modern Chrome, Firefox, and Safari (17+) decode it natively.

Will the file be smaller than my Xvid AVI?

Almost always, yes. VP9 typically yields a 40–60% smaller file than Xvid-in-AVI at the same perceived quality, and AV1 can shave another 20–30% off VP9. The exact ratio depends on the source bitrate — a heavily-compressed Xvid rip at 800 kbps won't shrink as dramatically as a 2 Mbps Xvid copy.

What about Safari? Does WebM actually play on iPhone?

Yes, but only on recent versions. macOS Safari 16.0+ (Sept 2022) and iOS Safari 17.4+ (March 2024) play WebM natively, including VP8, VP9, and AV1 streams. Older iPhones running iOS 16 or earlier will not play .webm. If you need universal Apple-device compatibility, also publish an MP4/H.264 fallback inside the same <video> tag (browsers pick the first one they can play).

Why does the upload reject my .divx file?

.divx files are usually MPEG-4 Part 2 video — the same family as Xvid — wrapped in an AVI variant. xConvert's Xvid-to-WebM page accepts the .xvid extension by default; if your file is named .divx or .avi, try the DivX to WebM or AVI to WebM pages, which accept those extensions directly.

Does the audio survive the conversion?

Yes. The audio track from your AVI (typically MP3 or AC-3) is re-encoded into the WebM container as Opus or Vorbis. Opus is the modern default — it's higher-quality than MP3 at the same bitrate and is the audio codec WebM was designed around. If your source has multiple audio tracks, the primary one is kept; multi-track WebM authoring is a niche workflow.

Can I just remux instead of re-encoding?

Not from Xvid to WebM. Remuxing (changing container without touching codecs) only works when the target container supports the source codec — and WebM is strict: VP8, VP9, AV1 video plus Opus/Vorbis audio only. MPEG-4 Part 2 isn't a valid WebM video codec, so a re-encode is mandatory.

Do I need WebM, or would MP4 (H.264) be a better choice?

Both are open formats for the modern web, but they hit different sweet spots. WebM (VP9/AV1) gives you smaller files and royalty-free distribution. MP4 with H.264 has slightly broader hardware support — every device built since 2010 has H.264 decode, including embedded TVs, set-top boxes, and old Android. If you're publishing only to websites and modern browsers, WebM is the better choice. If you also need playback on legacy hardware, convert your Xvid file to MP4 instead, or publish both as <source> fallbacks.

How big a file can I convert in one pass?

The xConvert interface processes files within your browser session and does not impose a fixed cap that's tiny — multi-gigabyte AVI rips work fine on a desktop with reasonable memory. For very long Blu-ray-sized files, encoding time scales with codec choice (AV1 is the slowest by a wide margin, VP9 is a moderate middle ground, VP8 is fastest). Trim before converting if you only need a clip.