WMV to MP4 Converter
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Convert WMV to MP4 online
Convert WMV to MP4 to move a Windows Media file onto anything that is not a Windows PC. WMV plays reliably in Windows Media Player and almost nowhere else — not on phones, not in browsers, and not in most editing software.
When should you convert WMV to MP4?
- Play an old Windows recording on a phone or a Mac
- Upload footage to a site that rejects .wmv
- Import into editing software that will not read WMV
- Replace a legacy corporate video archive with a portable format
Before you convert
A real quality gain is possible
WMV2 is an old and inefficient codec. Re-encoding to H.264 usually produces a smaller file at the same visual quality — one of the few cases where converting is not purely a compatibility move.
DRM-protected WMV will not convert
Some WMV files carry Windows Media DRM. Those cannot be decoded and the job will fail.
What happens to your file
WMV to MP4 is a full re-encode, not a container swap: the video is decoded and re-compressed with libx264 (H.264) at CRF 23, preset medium, and the audio is re-encoded to AAC at 192 kbps. The MP4 index is moved to the front of the file (+faststart) so it can start playing before the whole download finishes, and pixels are written as yuv420p for maximum device compatibility.
Settings this conversion runs with
| Engine | ffmpeg |
|---|---|
| Video codec | libx264 (H.264) |
| Video quality | CRF 23, preset medium |
| Audio codec | AAC |
| Audio bitrate | 192 kbps |
What changes
- The WMV picture is decoded and re-compressed with libx264 (H.264), so this is a generation loss: the output is built from an already-compressed source, not from the original camera data. Converting WMV to MP4 and back will soften the clip a little more each time.
- Only one video and one audio stream reach the MP4 file. Additional audio languages, embedded subtitle tracks, and chapter markers are not carried across.
About WMV and MP4 files
WMV video
Strengths
- good for moving images
Limitations
- compatibility varies by device
MP4 video
Strengths
- plays almost everywhere
- good quality-to-size
- widely supported
Limitations
- lossy compression
- less flexible than MKV
WMV vs MP4
| Format | WMV | MP4 |
|---|---|---|
| Compression | — | Lossy |
| Transparency | — | — |
| Best for | playback, streaming | streaming and sharing, playback on any device |
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Frequently asked questions
- Does converting WMV to MP4 re-encode the file?
- WMV to MP4 is a full re-encode, not a container swap: the video is decoded and re-compressed with libx264 (H.264) at CRF 23, preset medium, and the audio is re-encoded to AAC at 192 kbps. The MP4 index is moved to the front of the file (+faststart) so it can start playing before the whole download finishes, and pixels are written as yuv420p for maximum device compatibility.
- What should you know before converting WMV to MP4?
- The WMV picture is decoded and re-compressed with libx264 (H.264), so this is a generation loss: the output is built from an already-compressed source, not from the original camera data. Converting WMV to MP4 and back will soften the clip a little more each time.
- Is this WMV to MP4 converter free?
- Yes. You can convert WMV to MP4 online for free, with no account and no watermark.
- Do I need to install software or sign up?
- No. Use the converter from your browser without installing software or creating an account. Files are uploaded to our servers for processing.
- Will converting WMV to MP4 reduce quality?
- MP4 uses lossy compression, so the file can get smaller while some visual quality may change.
- Are my files safe?
- Yes. Files are processed only to complete the conversion and are auto-deleted after 2 hours. We never share them.