Is this WMV to WEBM converter really free?

Yes. Up to 5 files at a time, no signup, no catch. The free tier adds a small watermark to image output — Pro ($9.99/mo or $49/yr) removes it, raises the file size limit to 500 MB, and unlocks unlimited batch conversion.

Are my files uploaded to a server?

No — and you can verify it yourself. Open DevTools → Network tab, then convert a file. You'll see zero upload requests. Everything runs right in your browser. We never see your files.

How long does conversion take?

Usually 1–3 seconds for a typical file. The very first conversion on a fresh page load may take 5–20 seconds while the converter engine loads — after that it's instant. Your CPU does all the work locally.

What is the file size limit?

Free: up to 10 MB per file, 5 files per batch. Pro: up to 500 MB per file, unlimited batch. If you're working with large videos or RAW photos, Pro is built for that.

Can I batch convert multiple WMV files at once?

Yes — drop multiple files at once (or Ctrl/Cmd+click to select them) and they all convert in parallel. Free accounts handle up to 5 files per batch; Pro has no limit.

How large can my video files be?

Free accounts support files up to 10 MB — enough for short clips and GIFs. Pro raises that to 500 MB, which covers most 1080p videos. For files over 1 GB, a native app like HandBrake will be faster.

Will the video lose quality during conversion?

When only the container changes (e.g., MKV → MP4 where both use H.264), there's zero quality loss — it's a lossless rewrap. When the codec changes, we encode at CRF 23, which is near-transparent for most content.

Is WebM a good format for embedding old WMV footage on a website?

Yes — WebM (VP9 + Opus) is the royalty-free, browser-native video format. Converting WMV to WebM makes old footage publishable on any website without Flash, QuickTime, or Windows Media plugins.

How much smaller will the WebM be compared to the WMV?

VP9 (WebM's codec) is significantly more efficient than WMV's VC-1. Expect 30–50% smaller file sizes at equivalent visual quality, which improves page load times for web-published video.

How private is this converter?

Completely private — by design, not policy. There is no upload endpoint. Files are processed right inside your browser tab and disappear the moment you close it. We collect only anonymous page-view counts; your file content is never seen or stored.

WMV to WebM Converter — Free, Online, No Upload

How to convert WMV to WEBM online

1
Drop your WMV file
Drag and drop your Windows Media Video file onto the converter, or click to browse your files. You can select up to 5 at once. Nothing leaves your device — conversion happens right here in the browser.
2
Hit Convert — it happens locally
Click Convert and watch it go. There's no upload, no server queue, no waiting. The converter runs Windows Media Video → WebM Video Format entirely in your browser tab. Most files finish in 1–3 seconds.
3
Download your WEBM
Your WebM Video Format file is ready. Click Download, or grab a ZIP if you converted a batch. Close the tab and everything disappears — no copies kept anywhere.

WMV vs WEBM: format overview

WMV

Windows Media Video

Microsoft · 2003

Compression: lossy
Transparency: No

✓ Good compression for Windows-native workflows
✓ DRM support for content protection
✗ Not supported on macOS, iOS, Android natively

WEBM

WebM Video Format

Google (On2 Technologies) · 2010

Compression: lossy
Transparency: No

✓ Royalty-free codec (VP8/VP9/AV1)
✓ Excellent web streaming support

WMV magic bytes: 30 26 B2 75 8E 66 CF 11

WEBM magic bytes: 1A 45 DF A3

Why convert WMV to WEBM?

WMV files cannot be played in a web browser using the HTML5 video element. Chrome, Firefox, Safari, and Edge all reject WMV as an unsupported format for native web playback. If you have corporate videos, training content, or recorded presentations in WMV format and want to embed them on a website or web application, you need a format the browser actually understands.

WebM is the open, royalty-free video format designed specifically for HTML5 web embedding. It uses VP9 video and Opus audio — both open codecs with no licensing requirements. Chrome, Firefox, and Edge support WebM natively and completely. It delivers excellent compression at low file sizes, making it ideal for web delivery where bandwidth and load time matter.

Converting WMV to WebM transcodes the Windows Media Video to VP9 and the WMA audio to Opus, producing a file that embeds directly in an HTML5 video element without any plugins or media servers. The conversion is a re-encode, which introduces some quality change — use higher bitrates if you need quality close to the original. WebM files are typically much smaller than WMV at equivalent visual quality. Note that Safari has historically had limited WebM support, so serving MP4 alongside WebM as a fallback is recommended for full browser coverage.

Quality & file size: WMV to WEBM

Typical file sizes: WMV 50–150 MB → WEBM 50–200 MB.

Both WMV and WEBM use lossy compression. We transcode at high quality settings (equivalent to WEBM's recommended web quality) to minimize generational loss.

Color depth: WMV supports standard color, WEBM supports standard color.

Transparency: WMV does not support transparency. WEBM does not support transparency — transparent areas become solid white.

Frequently asked questions

Privacy: how FormatDrop handles your files

Your WMVfiles are converted 100% inside your browser. They are never uploaded to our servers, never stored, and never seen by anyone other than you. This isn't a privacy policy claim — it's an architectural guarantee: our server has no endpoint that receives file bytes.