WMV to MP4 Converter

How to Convert WMV to MP4 Online

1. Upload Your WMV File: Drag and drop or click "Add Files" to select WMV videos. Old Windows Movie Maker exports, security camera footage, archived Office presentations, and Windows Media Encoder files all work. Batch is supported.
2. Pick a Codec and Quality: Default is H.264 for universal compatibility. Choose H.265 / HEVC for ~40% smaller files at the same quality, or AV1 for the smallest size on modern devices. Set a quality preset (Highest → Lowest), target a percentage of the original size or an exact size in MB, or fine-tune with CRF (18 = visually lossless, 23 = default, 28 = smaller).
3. Resize or Trim: Pick a resolution preset (1080p / 720p / 480p / 360p), enter custom width × height, scale by percentage, or trim a section using start time + duration in HH:MM:SS.sss format. Old WMV recordings often benefit from being downscaled to a sane resolution.
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 MP4?

WMV (Windows Media Video) is Microsoft's proprietary container — common from the Windows XP / Vista / 7 era of Windows Movie Maker, Movie Maker Live, Windows Media Encoder, and screen-capture tools like Camtasia 7 and Camstudio. It uses Microsoft's WMV codecs (WMV1, WMV2, WMV3 / VC-1) which are licensed and supported in fewer modern players each year. Common reasons people convert WMV → MP4:

• macOS and iOS compatibility — macOS has no native WMV support; QuickTime won't play WMV, Finder won't preview, AirDrop recipients on Mac see nothing. iPhones can't open WMV at all without third-party apps.
• Recovering old video libraries — Family videos exported from Windows Movie Maker (2003-2012), school project archives, security camera DVR exports — all WMV. Converting to MP4 makes them playable on phones, modern Macs, smart TVs, and cloud photo services.
• Browser and web playback — No web browser plays WMV natively. MP4 with H.264 plays in every browser back to IE9.
• Social media and sharing — YouTube accepts WMV but transcodes it (often poorly). Instagram, TikTok, X reject WMV outright. MP4 is the universal upload format.
• Editing in modern software — DaVinci Resolve, CapCut, Premiere Pro, Final Cut all handle MP4 cleanly. WMV either fails to import or imports without audio on Mac and Linux machines.
• Smaller files — Modern H.264 / H.265 encoders are 20-40% more efficient than WMV3 / VC-1 at the same quality.

WMV vs MP4 — Format Comparison

Codec Choice for the MP4 Output

Frequently Asked Questions

Will I lose quality converting WMV to MP4?

At default settings the quality loss is minimal — visually comparable to the source and sometimes slightly improved on high-motion content where WMV3/VC-1 struggled, because H.264/H.265 handle those scenes more efficiently. Set CRF 18-20 or "Highest" quality preset for visually lossless output. The conversion re-encodes from the WMV codec to your chosen MP4 codec.

Why won't my WMV play on my Mac or iPhone?

macOS and iOS have never shipped with WMV codec support — Apple and Microsoft have separate codec ecosystems. QuickTime, Files preview, AirDrop, Photos, and iMessage all reject WMV. Workarounds (VLC, Flip4Mac plugin) are inconsistent on newer macOS versions. Converting to MP4 with H.264 is the cleanest fix — the file plays natively in every Apple app afterward.

Can I batch convert multiple WMV files at once?

Yes — drop in as many WMV files as you want, including entire folders of old Windows Movie Maker exports. They convert in parallel on our servers and download individually or as a single ZIP. Settings can be applied uniformly or per-file.

Should I pick H.264, H.265, or AV1 for the MP4?

H.264 if you need universal playback (older Windows, basic media players, embedded video in Word/PowerPoint). H.265 if you want roughly 40% smaller files for archiving an old video library. AV1 if you're future-proofing — smallest files at high quality, but takes longer to encode and requires modern devices to decode smoothly.

Can I trim or cut the WMV while converting?

Yes. Use the trim section to enter a start time and duration. Both accept seconds (12.5) or HH:MM:SS.sss format (00:01:30.500). Useful for skipping the title-card frames and intro music in old Windows Movie Maker exports.

What about the audio track?

WMV typically uses Windows Media Audio (WMA) for sound; MP4 uses AAC by default (or MP3 if you choose). Audio is re-encoded transparently. If your WMV has multiple audio tracks (some screen recorders save mic + system audio separately), the primary track is kept.

Will my old security camera DVR exports convert correctly?

Yes — most CCTV DVRs export proprietary WMV variants that VLC and modern converters handle. The result will be a playable MP4. Note that some DVRs add timestamp overlays that bake into the video and remain visible after conversion. If the DVR uses a non-standard codec inside the WMV container, the file may still convert but with audio-only output — try a small test clip first.

Why is my converted MP4 smaller than the original WMV?

Because H.264 and H.265 are more compression-efficient than WMV3 / VC-1 at the same visual quality. A 100 MB WMV from 2008 might convert to a 50-70 MB MP4 with no perceptible quality loss. This is normal — modern codecs are simply better at compressing video than the codecs from the WMV era.