Is this WMV to MP4 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.

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 MP4 Converter — Free, Fast, No Upload

How to convert WMV to MP4 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 → MPEG-4 Part 14 entirely in your browser tab. Most files finish in 1–3 seconds.
3
Download your MP4
Your MPEG-4 Part 14 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 MP4: 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

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

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

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

Why convert WMV to MP4?

WMV — Windows Media Video — was Microsoft's default video format from the late 1990s through the mid-2000s. It was baked into Windows Movie Maker, early webcam software, corporate screencasting tools, and security camera systems of that era. Those files are still common in corporate training libraries, archived webinars, old home movies recorded on early HD webcams, and footage exported from legacy screen-recording software. The format plays natively on Windows but requires codec installation on Mac and Linux, and most mobile devices will refuse to play it at all.

MP4 with H.264 encoding is the format that replaced WMV for all practical purposes. It plays on every phone, every browser, every smart TV, and every modern video editing tool including Premiere Pro, Final Cut Pro, DaVinci Resolve, and CapCut. Uploading to YouTube, Vimeo, LinkedIn, or Twitter all prefer or require MP4. Converting your archive of WMV training videos or old recordings into MP4 makes them accessible to anyone without any software configuration.

WMV's compression efficiency is significantly worse than H.264, so the converted MP4 will typically be smaller than the original WMV at equivalent visual quality. Low-resolution WMV files from early webcams or screen captures will convert cleanly but cannot gain resolution that was not captured originally. For older files with low bitrates, set the MP4 encoding bitrate conservatively — re-encoding at a much higher bitrate than the source wastes space without improving quality.

Quality & file size: WMV to MP4

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

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

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

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

Frequently asked questions

Privacy: how FormatDrop handles your files

Your WMV files 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.