FLV to AVI Converter
Convert FLV to AVI free — no upload, no signup
To convert FLV to AVI, drop your FLV 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. Convert Flash video for older AVI players.
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 FLV to AVI
Add your FLV videos
Drag and drop FLV 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 AVI, Fylo repackages the file instead of re-encoding it, with no quality loss.
Convert and download
Click Convert, then download each AVI file or all of them as one ZIP.
Why convert FLV to AVI?
Old DVD players and Windows apps that only read AVI can't open FLV.
What happens when you convert FLV to AVI?
Fylo re-encodes to Xvid-compatible MPEG-4 with MP3 audio. Files are usually larger than the FLV.
How does Fylo convert FLV to AVI?
Fylo reads the FLV with ffmpeg compiled to WebAssembly and writes MPEG-4 Part 2 tagged as Xvid with MP3 audio — the combination old DVD players and TVs understand. FLV's usual codecs (H.264, Sorenson Spark, VP6) can't go into AVI 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 FLV and AVI?
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.
AVI (Audio Video Interleave) was introduced by Microsoft with Video for Windows in 1992. It's based on the RIFF container used by WAV and stores interleaved chunks of audio and video. In the 2000s, AVI files with DivX or Xvid (MPEG-4 Part 2) video and MP3 audio were the standard for downloaded movies.
Learn more: FLV format guide · AVI format guide
| Property | FLV | AVI |
|---|---|---|
| Developed by | Macromedia / Adobe | Microsoft |
| Introduced | 2003 | 1992 |
| Typical video codecs | H.264, Sorenson Spark, VP6 | MPEG-4 Part 2 (Xvid/DivX), MJPEG |
| Typical audio codecs | AAC, MP3 | MP3, PCM, AC-3 |
| Plays in web browsers | No (Flash Player ended in 2020) | No |
| Compatibility | VLC and some desktop players; RTMP live-streaming tools | Windows, VLC, older DVD players and TVs |
| Best for | Old Flash archives, RTMP streaming workflows | Legacy players, old Windows software |
Frequently asked questions
Will the AVI play on my TV?
Most TVs and DVD players with USB support Xvid AVI.
Is there a better format?
MP4 is smaller and more compatible with modern devices.
Is my FLV file uploaded to a server?
No. Fylo runs ffmpeg, the same engine used by professional video tools, compiled to WebAssembly inside your browser. Your FLV file is read directly from your device and never sent anywhere.
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