Convert Windows Media Video (.wmv) to Flash Video (.flv) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
Upload your .wmv file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .flv file when it's ready.
WMV was Microsoft's streaming video format for Windows Media Services and Silverlight, while FLV (Flash Video) was Adobe's answer for web-based video streaming. Both are legacy streaming formats from the 2000–2015 era. FLV carried either Sorenson Spark (H.263), VP6, or H.264 video with MP3 or AAC audio, and powered YouTube, Hulu, and nearly every video-hosting site before the HTML5 migration. Converting WMV to FLV repackages Microsoft's content for Adobe's legacy ecosystem — still relevant for certain CMS platforms and Chinese video infrastructure.
Some legacy content management systems, e-learning platforms, and video hosting solutions built during the Flash era still require FLV input. Bilibili, Youku, and other Chinese platforms have significant FLV archives. If you are maintaining or migrating a Flash-based video system and your source content is in WMV format, converting to FLV produces compatible output without rebuilding the delivery infrastructure.
FFmpeg decodes the VC-1/WMV2 video and WMA audio from the ASF container, then re-encodes video to H.264 (or Sorenson Spark for maximum Flash Player compatibility) and audio to AAC or MP3. The output is wrapped in the FLV container with onMetaData tags for duration, resolution, and seeking metadata. H.264 inside FLV supports up to 1080p, though most legacy systems expect 480p or 720p.
H.264 in FLV provides the same quality as H.264 in MP4 — the container does not affect the codec. At typical web bitrates (1–5 Mbps), the result looks clean. Using Sorenson Spark codec for older Flash Player versions produces significantly lower quality, typical of early-2000s web video.
| Device | WMV | FLV |
|---|---|---|
| Windows PC | Native | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No |
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
WMV to FLV conversion bridges two legacy ecosystems — Microsoft's streaming platform and Adobe's Flash ecosystem. While both are outdated, the conversion remains necessary for maintaining existing infrastructure.
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Works Everywhere
| No |
Any browser, any device
| Feature | WMV | FLV |
|---|---|---|
| Full Name | Windows Media Video | Flash Video |
| Extension | .wmv | .flv |
| Best For | Windows native | Small file size |