Convert WebM to FLV — Free Online Converter
Convert WebM Video (.webm) to Flash Video (.flv) online for free. Fast, secure video conversion with no watermarks or registration....
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Файлы автоматически удаляются после обработки
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Любой браузер, любое устройство
Как конвертировать
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.
About WebM to FLV Conversion
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.
Why Convert WebM to FLV?
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.
Common Use Cases
- Ingesting WebM web video into RTMP-based live streaming servers
- Uploading WebM content to legacy CMS platforms that accept only FLV
- Converting web video for Flash-based e-learning platforms not yet migrated to HTML5
- Feeding WebM content into legacy video CDN workflows using FLV
- Preparing WebM for integration with older Wowza or Red5 streaming servers
How It Works
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.
Quality & Performance
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 Compatibility
| Device | WebM | FLV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Native | Partial |
| Linux | Partial | Partial |
| Web Browser | Native | No |
Recommended Settings by Platform
YouTube
Resolution: 1920x1080
Bitrate: 8-12 Mbps
H.264 recommended for fast processing
Resolution: 1080x1080
Bitrate: 3.5 Mbps
Square or 9:16 for Reels
TikTok
Resolution: 1080x1920
Bitrate: 4 Mbps
9:16 vertical, under 60s ideal
Twitter/X
Resolution: 1280x720
Bitrate: 5 Mbps
Under 140s, 512MB max
Resolution: 960x540
Bitrate: 2 Mbps
16MB limit for standard, 64MB for document
Discord
Resolution: 1280x720
Bitrate: 4 Mbps
8MB free, 50MB Nitro
Tips for Best Results
- 1Use H.264 Main Profile for the best quality in FLV — Baseline for maximum RTMP server compatibility
- 2Convert audio to AAC for better quality than MP3 in the FLV container
- 3Target 720p at 2-4 Mbps for standard web delivery through RTMP
- 4Add FLV metadata tags for proper duration and seek behavior
- 5Consider migrating to HLS/DASH instead of maintaining FLV infrastructure
Related Conversions
WebM to FLV serves legacy streaming infrastructure, converting modern web video for RTMP-based delivery and Flash-era platforms.