Convert WebM Video (.webm) 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 .webm 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.
WebM is Google's modern open web video format using VP8/VP9/AV1 codecs. FLV (Flash Video) was Adobe's web streaming format from 2005-2015, supporting H.264 or VP6 video with AAC or MP3 audio. Converting WebM to FLV targets legacy RTMP streaming servers and Flash-based content management systems.
Legacy RTMP streaming infrastructure and Flash-era CMS platforms still require FLV input. Some live streaming setups use RTMP ingest, which natively transports FLV packets. Converting WebM to FLV enables feeding modern web video into these legacy delivery systems.
This is a transitional conversion — most organizations should be migrating from FLV/RTMP to HLS/DASH, but many have not completed the transition.
FFmpeg decodes VP8/VP9 video and Opus/Vorbis audio from WebM, then transcodes to H.264 Baseline or Main Profile with AAC audio in the FLV container. VP6 encoding is available for maximum Flash Player backward compatibility. The FLV tag structure provides timestamped audio and video packets suitable for RTMP transport.
H.264 in FLV produces comparable quality to VP9 WebM at similar bitrates. The conversion is primarily for container and protocol compatibility. Quality is excellent at standard web delivery bitrates (1-5 Mbps for 720p).
| Device | WebM | FLV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Native | Partial |
| Linux | Partial | Partial |
| Web Browser | Native |
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
WebM to FLV serves legacy streaming infrastructure, converting modern web video for RTMP-based delivery and Flash-era platforms.
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8MB free, 50MB Nitro
Mọi trình duyệt, mọi thiết bị
| Tính năng | WebM | FLV |
|---|---|---|
| Tên đầy đủ | WebM Video | Flash Video |
| Phần mở rộng | .webm | .flv |
| Phù hợp nhất cho | Web optimized | Small file size |