Is this MP4 to WMV 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 MP4 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.

Why would I need to convert MP4 to WMV?

Some corporate systems, older Windows presentation software (older PowerPoint versions), and legacy DVD authoring tools only accept WMV video. Converting MP4 to WMV ensures compatibility with these environments.

Will WMV play on non-Windows devices?

WMV is primarily a Windows format. Macs require Flip4Mac or VLC. Linux needs additional codecs. If you need cross-platform compatibility, keep MP4. Only convert to WMV when the destination specifically requires it.

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.

MP4 to WMV Converter — Free, Online, No Upload

How to convert MP4 to WMV online

1
Drop your MP4 file
Drag and drop your MPEG-4 Part 14 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 MPEG-4 Part 14 → Windows Media Video entirely in your browser tab. Most files finish in 1–3 seconds.
3
Download your WMV
Your Windows Media Video file is ready. Click Download, or grab a ZIP if you converted a batch. Close the tab and everything disappears — no copies kept anywhere.

MP4 vs WMV: format overview

MP4

MPEG-4 Part 14

Moving Picture Experts Group · 2001

Compression: lossy
Transparency: No

✓ Universal compatibility across all platforms
✓ Excellent compression with H.264/H.265
✗ H.264 has royalty implications

WMV

Windows Media Video

Microsoft · 2003

Compression: lossy
Transparency: No

✓ Good compression for Windows-native workflows
✓ DRM support for content protection

MP4 magic bytes: 00 00 00 xx 66 74 79 70

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

Why convert MP4 to WMV?

You have a video in MP4 and you need to embed it in a PowerPoint presentation on an older Windows machine, hand it off to a corporate AV system, or upload it to a legacy intranet platform that only recognizes Windows Media Video files. Modern Windows plays MP4 fine, but older Windows environments, corporate video kiosks, and some educational platforms still list WMV as their required format — and they genuinely won't accept anything else.

WMV (Windows Media Video) is Microsoft's proprietary video container. Windows Media Player opens WMV without any additional software on every version of Windows since XP. Some corporate learning management systems (LMS), older SharePoint installations, and legacy video production workflows specify WMV because it was the Windows default during the years those systems were built. Converting your MP4 to WMV produces a file that these environments play without configuration or complaints.

WMV uses Microsoft's VC-1 codec, which is less efficient than H.264 at the same bitrate — meaning WMV files will be somewhat larger or lower quality than equivalent MP4 at the same setting. Encode at a high bitrate (4 Mbps or more for HD content) to minimize visible quality loss. Outside of Windows, WMV support is patchy: macOS requires Flip4Mac or VLC, and Linux needs additional GStreamer codecs. Only convert to WMV when the destination specifically demands it.

Quality & file size: MP4 to WMV

Typical file sizes: MP4 100–300 MB → WMV 50–150 MB.

Both MP4 and WMV use lossy compression. We transcode at high quality settings (equivalent to WMV's recommended web quality) to minimize generational loss.

Color depth: MP4 supports standard color, WMV supports standard color.

Transparency: MP4 does not support transparency. WMV does not support transparency — transparent areas become solid white.

Frequently asked questions

Privacy: how FormatDrop handles your files

Your MP4files 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.