WMV to WebM Converter

How to Convert WMV to WebM Online

1. Upload Your WMV File: Drag and drop or click "Add Files" to select WMV files from your computer. Old Windows Movie Maker exports, Windows Media Encoder captures, screen-recorder saves, and legacy corporate training videos all work. Batch is supported — drop in an entire folder of.wmv archives.
2. Pick a Codec and Quality: Default is VP9 (Google's modern web video codec) paired with Opus audio. Choose AV1 for the smallest output on 2022+ devices, or VP8 for maximum legacy browser compatibility. Set a quality preset (Highest → Lowest), target a percentage of the original size, hit an exact size in MB, or fine-tune with CRF (VP9/AV1 scale: 18 = visually lossless, 30 = default for web, 36 = small).
3. Resize or Trim (Optional): Pick a resolution preset (1080p / 720p / 480p / 360p), enter custom width × height, scale by percentage to keep aspect, or trim using start time + duration in HH:MM:SS.sss. Useful for cropping the dead space at the start of old Movie Maker exports.
4. Convert and Download: Click Convert. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared.

Why Convert WMV to WebM?

WMV (Windows Media Video) is Microsoft's proprietary container, designed in 1999 for Windows Media Player and Windows Movie Maker. It's effectively dead on the modern web — no major browser plays it natively, and Apple devices reject it entirely. WebM is Google's royalty-free, open-source format built specifically for HTML5 <video>. Converting unlocks legacy Windows footage for the modern web:

• Embedding old Windows Movie Maker projects on a website — Decade-old school projects, family videos, and corporate training reels are stuck in WMV. WebM makes them playable in <video> tags across Chrome, Firefox, Edge, Opera, and Safari 14.1+.
• Self-hosted product demos and tutorials — VP9 inside WebM is typically 30-50% smaller than the original WMV at equivalent visual quality. Faster page loads, lower bandwidth bills, no YouTube dependency.
• Cross-platform sharing with Mac and Linux users — WMV requires extra codec packs on macOS and Linux. WebM plays natively in every modern browser on every OS.
• Royalty-free codec for commercial streaming — WMV's licensing comes from Microsoft; WebM (VP8 / VP9 / AV1) has zero licensing fees for commercial use.
• Background videos and looping clips — Hero-section autoplay backgrounds need small, fast-loading files. WMV is too bloated; WebM at VP9 hits the size budget.
• Archiving old corporate / education libraries — Universities and businesses with WMV archives from the 2000s migrate to WebM to keep content alive past Windows Media's deprecation.

WMV vs WebM — Format Comparison

Codec Choice for the WebM Output

Frequently Asked Questions

Why won't my WMV file play in Chrome or Safari?

Chrome dropped WMV support years ago, and Safari never had it. WMV uses Microsoft's VC-1 / WMA codecs, which aren't part of the HTML5 spec. WebM (VP9 / Opus) is the modern equivalent — once converted, the same file plays in every browser on every OS without plugins.

Will I lose quality converting WMV to WebM?

A small re-encoding loss is unavoidable since WMV's VC-1 and WebM's VP9 are different codecs. At CRF 18-22 the difference is invisible in normal viewing, and VP9 is more efficient than WMV3 — output is often smaller and sharper than the source. Lower-quality WMVs (320×240 from old Movie Maker) won't gain detail but won't degrade visibly either.

How do I convert old Windows Movie Maker exports?

Movie Maker's default export is.wmv with WMV3 video and WMA2 audio. Upload directly — both codecs are decoded automatically. For aged 4:3 footage, leave resolution at "original" to preserve the aspect ratio, or pick 480p / 360p to match the source quality. See also WMV to MP4 if you need a phone-friendly version.

Should I pick VP9, AV1, or VP8?

VP9 for almost every web embedding case — universal modern browser support, 30-50% smaller than the source WMV, fast enough to encode in browser. AV1 for archival or when you want the absolute smallest file and your audience is on 2022+ devices (encoding is 5-10× slower but the file is roughly half the size). VP8 only if you specifically need pre-2017 Android or extremely conservative compatibility.

What happens to the WMA audio track?

WMA (Windows Media Audio) is re-encoded to Opus by default (the modern WebM standard) or Vorbis if you prefer. Audio quality is preserved — Opus at 96-128 kbps is transparent for speech and music, often sounding better than the original WMA at the same bitrate. If your WMV has multiple audio tracks (rare), the primary track is kept.

Can I batch convert a folder of old WMVs?

Yes. Drop in entire folders of legacy footage — corporate training libraries, old wedding videos, school project archives. Files convert in parallel on our servers and download individually or as a single ZIP. There's no fixed cap on batch size.

Can I trim while converting to skip the intro?

Yes. Use the trim section to enter a start time and duration. Both accept seconds (12.5) or HH:MM:SS.sss format (00:00:30.500). Handy for old Movie Maker files that start with a black frame or unwanted title card — trim first to skip the dead space and shrink the output before encoding.

Will Safari users be able to play the WebM?

Safari 14.1+ (macOS Big Sur and later, iOS 14.5+) supports WebM with VP9. For older Safari, embed both formats in your <video> tag — WebM first, an MP4 fallback second. Modern Safari picks the WebM; older Safari falls back to MP4. Convert the fallback with WMV to MP4.

What's the file size limit?

XConvert handles large WMV files including multi-GB archives from old corporate cameras. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — there's no hard 1 GB cap. There is also no quantity limit on batch jobs.