Windows Media · universal out

WMV to MP4 WMV in. MP4 out.

WMV is a relic that still ships out of corporate Windows machines, old camcorders, and archive footage drives. MP4 + H.264 is the format the rest of the world plays. Morph runs FFmpeg.wasm in your browser tab — drop the WMV, the decoder unwraps WMV3/VC-1, the encoder produces a real H.264 + AAC MP4 with a moov-faststart atom, ready to play anywhere. Local file in, local file out. No upload, no watermark.

Open Morph
Drop a file here
WMV → MP4
Choose a file
Reads and writes inside this tab. Nothing is sent anywhere.

What it actually does

01
DECODE

WMV3, VC-1, WMA all read locally.

FFmpeg.wasm includes the full WMV decoder family. The .wmv file you have from 2008 still parses cleanly. Audio comes through the WMA decoder.

02
ENCODE

H.264 + AAC + faststart

The MP4 you get is what every player wants — moov atom up front, video first.

03
PRIVATE

Sensitive footage stays local

Corporate dumps, archive material — never uploaded.

04
BATCH

Folder of WMVs in one go

Drop a folder, run the batch, no per-file API call.

How it works

  1. Open morph.cool in any modern browser. No install.
  2. Drop the WMV — single file or full folder.
  3. Pick MP4 from the format menu. Morph runs FFmpeg.wasm locally.
  4. The .mp4 saves to your downloads. The original WMV is untouched.
  5. Need more than a converter? The rest of Morph runs on your device too — free, with credits only for AI and server work.
3 codecsWMV3 + VC-1 + WMA
0Upload
∞Batch limit

Why people leave the upload-first WMV converters

WMV files often hold things you do not want on a third-party server — corporate training footage, legal screen captures, family archive material. Most WMV-to-MP4 sites still POST the file to a server, watermark beyond a free quota, and cap by file size. Morph runs the convert in your browser.

Frequently asked

Why convert WMV to MP4?

WMV is a Microsoft container with codecs that modern hardware decoders rarely accelerate. MP4 + H.264 plays everywhere — every browser, every editor, every TV, every phone, every social platform. Convert once, play forever.

Does the file upload?

No. FFmpeg.wasm runs in your browser tab. The WMV decode and the MP4 encode both happen locally. Old archive footage, sensitive screen captures, anything from a corporate Windows machine — never leaves your device.

What about WMV3 / VC-1?

Both supported. FFmpeg's WMV decoder handles WMV1/2/3 and VC-1 streams. The output MP4 uses H.264 — universally playable.

Audio handling?

WMA audio in the WMV is decoded and re-encoded as AAC for the MP4 container. Stereo and mono both supported.

Quality loss?

Re-encoding always introduces some loss. Morph encodes at high CRF settings by default to keep visible loss minimal. You can choose higher bitrates for archive masters.

Mobile?

Yes. Safari and Chrome on iOS/Android both support FFmpeg.wasm.

While you're here Open Morph AVI to MP4 MKV to MP4 WebM to MP4 Morph Pro
Convert WMV → MP4
Convert WMV → MP4
Nothing leaves your device · Free for what you make, credits for what we run