Convert Audio Video Interleave (.avi) 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 .avi 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.
AVI is a desktop-oriented container from the early 1990s with no built-in streaming capability. FLV (Flash Video) was Adobe's streaming video format, dominant across the web from 2005 to 2015, carrying Sorenson Spark (H.263), VP6, or H.264 video with MP3 or AAC audio. Although Flash Player reached end-of-life in December 2020, FLV files remain widely used in legacy content management systems, Chinese video platforms (Bilibili, Youku archives), and existing CDN workflows that have not migrated to MP4/HLS.
Some legacy systems and CMS platforms still require FLV format for video uploads. Older streaming servers (Red5, Wowza legacy configs) expect FLV input. If you manage a video library built on Flash-era infrastructure or need to deliver content to systems that specifically require FLV, converting AVI to FLV bridges the gap between desktop video and these legacy streaming workflows.
FFmpeg decodes the AVI video and audio streams, then re-encodes to H.264 (or Sorenson Spark for maximum legacy compatibility) for video and AAC (or MP3) for audio, wrapping the output in the FLV container. FLV supports H.264 at up to 1080p, but many legacy players expect lower resolutions (480p or 720p). The FLV container adds onMetaData tags (duration, dimensions, framerate, bitrate) for proper seeking in Flash-based players.
With H.264 encoding, FLV delivers quality identical to MP4 at the same bitrate and resolution — the container does not affect codec performance. If using legacy Sorenson Spark codec for older Flash Player compatibility, quality will be notably lower, comparable to early web video from the 2005–2008 era.
| Device | AVI | 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
AVI to FLV conversion serves a specific niche: feeding content into legacy Flash-era systems. For new projects, MP4 is always the better choice, but FLV conversion remains necessary for maintaining existing infrastructure.
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8MB free, 50MB Nitro
Mọi trình duyệt, mọi thiết bị
| Tính năng | AVI | FLV |
|---|---|---|
| Tên đầy đủ | Audio Video Interleave | Flash Video |
| Phần mở rộng | .avi | .flv |
| Phù hợp nhất cho | Windows native | Small file size |