WebM to WMV Converter

How to Convert WebM to WMV Online

1. Upload Your WebM File: Drag and drop or click "+ Add Files" to add one or more .webm clips. Batch is supported — all files in a run use the same settings.
2. Pick Quality Preset and Codec: Default is Very High (Recommended), which transcodes to WMV2 (Windows Media Video 8) inside an ASF container with WMAv2 audio. Switch to High, Medium, Low, or Lowest for smaller files, or open File Compression to set a Specific file size (MB / KB), Constant Bitrate / Variable Bitrate in kbps or Mbps, or Constant Quality / Constraint Quality for codec-driven targeting.
3. Resize and Trim (Optional): Under Video resolution, keep Original, scale by Resolution Percentage, pick a Preset Resolution (144p through 4320p, plus vertical 1080x1920 and square 1080x1080), or enter custom Width, Height, or Width x Height. Under Trim, set a Time Range with start and end in HH:MM:SS.ms.
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 WebM to WMV?

WebM is Google's open container for the web, built on the Matroska structure and pairing VP8 / VP9 / AV1 video with Vorbis or Opus audio. It excels at HTML5 streaming but lives outside the Microsoft toolchain. WMV (Windows Media Video) is Microsoft's video format, stored in an ASF wrapper, with WMV9 standardized by SMPTE in April 2006 as VC-1 (SMPTE 421M). Converting WebM to WMV gets your footage into a format that the legacy Windows ecosystem still treats as a first-class citizen.

• Windows Movie Maker and older Movie Maker projects — Movie Maker (the classic 2012-and-earlier desktop app many people still run) imports WMV and AVI natively but has no WebM decoder. Converting first is the only path to drop a YouTube-downloaded .webm onto its timeline.
• PowerPoint compatibility on legacy installs — PowerPoint 2010 / 2013 / 2016 happily embeds WMV. Microsoft has since deprecated WMV in PowerPoint 2505 and later (which auto-converts to MP4 on insert), so WMV remains the safe pick for older offline machines but not for modern Microsoft 365 deployments.
• Windows-only corporate or kiosk environments — internal training portals, in-store digital signage, and locked-down enterprise desktops often whitelist Windows Media Player codecs only. WMV plays without installing Web Media Extensions or third-party codec packs.
• Streaming via legacy Silverlight or IIS Smooth Streaming pipelines — broadcasters still maintaining VC-1 archives need WMV/ASF for archival ingest workflows.
• Smaller files when targeting low bitrates — at SD bitrates around 1-2 Mbps, WMV2 / WMV9 hold up reasonably and produce predictable file sizes for email or USB-stick delivery to non-technical recipients.
• Removing VP9/AV1 decode load on aging hardware — pre-2014 Windows laptops without VP9 hardware decode will burn CPU playing WebM but breeze through WMV thanks to native decoder support.

WebM vs WMV — Format Comparison

Quality Preset and Bitrate Guide

For predictable sizes, switch to Specific file size (enter MB/KB target) or Constant Bitrate — 1500-2500 kbps suits 720p WMV, 3500-6000 kbps for 1080p, 8000-12000 kbps for higher motion content.

Frequently Asked Questions

Why is my converted WMV larger than the original WebM?

VP9 and AV1 (the codecs typically inside WebM) are roughly 30-50% more efficient than WMV9 / VC-1 at equivalent visual quality. Re-encoding to WMV at a comparable quality preset will produce a larger file. To match the original size, lower the Quality Preset, set a Specific file size target, or specify a Constant Bitrate closer to the source bitrate of the WebM.

Which WMV codec does the converter output — WMV2, WMV9, or VC-1?

The default encoder targets WMV2 (Windows Media Video 8) in an ASF container with WMAv2 audio, which is the most broadly compatible combination across Windows Media Player versions back to Windows XP. WMV3 (WMV9) provides better compression but requires WMP 9 or later (Windows XP SP2+); for modern Windows installs this is also widely supported.

Will WMV play on a Mac or iPhone?

Not natively. Microsoft discontinued Windows Media Components for QuickTime, and macOS / iOS do not include a WMV decoder. Mac users typically install VLC (free, all platforms) or convert WMV to MP4 first. If your audience is mixed-platform, WebM to MP4 is the better target — H.264/AAC plays on everything from a 2012 iPhone to a 2026 Smart TV.

Can I keep the same resolution and frame rate as my WebM?

Yes. Leave Video resolution on Keep original and the converter preserves the source dimensions. Frame rate is preserved automatically; the converter does not drop or duplicate frames unless you explicitly resize or change duration. Audio is re-encoded to WMAv2 by default, but timing stays in sync.

Why does Windows Movie Maker reject my WebM file but accept the WMV?

Windows Movie Maker (the 2012 standalone version and earlier Live Essentials versions) ships with codec support for WMV, AVI, MPEG, and a subset of MP4 — but no VP8 / VP9 / Opus decoder. There is no WebM codec pack that retrofits Movie Maker. WMV is the safest landing format because Movie Maker uses Windows Media Foundation for both decode and timeline rendering.

Should I convert to WMV or MP4 for PowerPoint?

For PowerPoint 2010-2019 on Windows, WMV is the most reliable embed format and survives "Save As" cycles without re-encoding surprises. For Microsoft 365 / PowerPoint 2505 and later, Microsoft now recommends MP4 (H.264 + AAC) and has deprecated WMV — files inserted as WMV may be auto-converted to MPEG-4 on the fly. If your deck will be opened in mixed versions, WebM to MP4 is the safer call.

Can I trim the WebM during the conversion to WMV?

Yes. Open the Trim section, switch from Unchanged to Time Range, then set start and end in HH:MM:SS.ms format. The converter trims to those boundaries before encoding to WMV. If you only need to cut without changing format, Trim WMV handles WMV input directly with no re-encode.

What's the file size cap and is the conversion done in the cloud?

Files upload to xconvert's processing servers, transcode there, and download back to your browser — they are not retained after your session ends. There is no watermark and no sign-up. For very large 4K masters the converter may queue rather than parallelize. If you only need a different container around the same VP9 stream, WebM to MP4 can sometimes stream-copy instead of re-encoding, which is much faster.

How does this differ from going WMV back to WebM?

WMV to WebM is the reverse direction — useful for uploading legacy WMV footage to YouTube, modern websites, or HTML5 players where WebM's VP9/AV1 efficiency cuts bandwidth. If you already have WMV and want a smaller file at the same quality, Compress WMV keeps the format but reduces size.