WMV to FLV Converter
Convert WMV to FLV free — no upload, no signup
To convert WMV to FLV, drop your WMV video into the box below and click Convert. Fylo converts with ffmpeg running inside your browser, so nothing is uploaded and there's no signup or watermark. Encode WMV to H.264 FLV for streaming tools.
Drop videos here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
If the video already uses codecs that fit the new format, Fylo repackages it instantly with no quality loss.
Advanced
How to convert WMV to FLV
Add your WMV videos
Drag and drop WMV files into the box or tap to choose them. The converter engine (about 31 MB) downloads once, the first time you convert.
Choose quality (optional)
Balanced quality suits most videos. If the codecs already fit FLV, Fylo repackages the file instead of re-encoding it, with no quality loss.
Convert and download
Click Convert, then download each FLV file or all of them as one ZIP.
Why convert WMV to FLV?
Streaming tools that accept FLV input don't handle WMV.
What happens when you convert WMV to FLV?
The video is re-encoded to H.264 with 44.1 kHz AAC audio.
How does Fylo convert WMV to FLV?
Fylo reads the WMV with ffmpeg compiled to WebAssembly and writes H.264 with AAC audio at 44.1 kHz, the sample rate Flash-era players expect. WMV's usual codecs (WMV 7/8/9 (VC-1)) can't go into FLV as-is, so the video is re-encoded. Speed depends on your device: short phone clips take seconds, while on our slow test PC a 2-minute 1080p video took about 10 minutes. Only the first video and audio track are kept, and the original resolution is preserved unless you pick 1080p, 720p or 480p under Advanced.
What's the difference between WMV and FLV?
WMV (Windows Media Video) is a family of Microsoft video codecs introduced in 1999, stored in the Advanced Systems Format (ASF) container together with WMA audio. WMV 9 was standardised as VC-1 and used on HD DVD and early Blu-ray discs.
FLV (Flash Video) was introduced with Flash Player 6 and 7 in 2002–2003 and became the format behind early YouTube, news sites and video portals. Later FLVs usually contain H.264 video and AAC audio — the same codecs as MP4.
Learn more: WMV format guide · FLV format guide
| Property | WMV | FLV |
|---|---|---|
| Developed by | Microsoft | Macromedia / Adobe |
| Introduced | 1999 | 2003 |
| Typical video codecs | WMV 7/8/9 (VC-1) | H.264, Sorenson Spark, VP6 |
| Typical audio codecs | WMA | AAC, MP3 |
| Plays in web browsers | No | No (Flash Player ended in 2020) |
| Compatibility | Windows Media Player, Windows apps; poor on Mac and phones | VLC and some desktop players; RTMP live-streaming tools |
| Best for | Old Windows software and PowerPoint presentations | Old Flash archives, RTMP streaming workflows |
Frequently asked questions
Can browsers play FLV?
No, FLV is for streaming tools and desktop players.
Is audio converted?
Yes, WMA becomes AAC.
Is my WMV file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your WMV file is read directly from your device and never sent anywhere.
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