Convert AVI to FLV Online Free
Convert AVI video files to FLV for Flash-based video platforms, legacy streaming systems, and RTMP workflows. ChangeThisFile processes your file with FFmpeg on secure servers — no setup required.
ChangeThisFile converts AVI to FLV free using FFmpeg on secure servers. Your AVI uploads with encrypted transfer, is processed server-side to FLV format, and automatically deleted after download. No signup required — private and completely free.
Convert AVI to FLV
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AVI vs FLV: Format Comparison
Key differences between the two formats
| Feature | AVI | FLV |
|---|---|---|
| Full Name | Audio Video Interleave | Flash Video |
| Developer | Microsoft | Adobe Systems |
| Primary Use | Desktop video storage | Flash streaming and embedding |
| Video Codec | DivX, Xvid, H.264, MPEG-4 | H.263, VP6, H.264 |
| Audio Codec | MP3, PCM, AC-3 | MP3, AAC, Nellymoser |
| Streaming | Not optimized | RTMP, progressive download |
| Browser Support | No native support | Flash Player required |
| Modern Use | Archive/legacy | Legacy Flash platforms |
When to Convert
Common scenarios where this conversion is useful
Legacy Flash CMS Upload
Convert AVI source files to FLV for upload to older Flash-based content management systems that expect FLV video input.
RTMP Broadcasting Archives
Prepare AVI recordings for streaming via RTMP server infrastructure or archiving alongside existing Flash Video libraries.
Flash-Based Website Players
Supply FLV content for legacy HTML pages with embedded Flash video players that do not accept AVI files.
Flash-Era E-Learning Content
Convert AVI training videos to FLV for upload to learning management systems built on Adobe Flash video delivery.
Archival Format Standardization
Convert AVI files to FLV to create a uniform Flash Video format archive across older media libraries.
How to Convert AVI to FLV
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1
Upload Your AVI File
Select or drag and drop your AVI video. ChangeThisFile encrypts the upload in transit using HTTPS for your privacy and security.
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2
Server-Side FFmpeg Conversion
FFmpeg on our servers transcodes your AVI video and audio into the FLV container using H.264 video and AAC audio for Flash compatibility.
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3
Download the FLV File
Download your converted FLV when ready. The original AVI file is permanently deleted from our servers immediately after conversion.
Frequently Asked Questions
FLV is required for legacy Flash-based video platforms, RTMP streaming servers, and older embedded video players. Despite Flash's deprecation, FLV archives and some legacy systems still require this format.
Yes. VLC, MPC-HC, and many other media players support FLV playback without Adobe Flash Player, which was discontinued in 2020.
FFmpeg supports most AVI codec variants including DivX, Xvid, MPEG-4, H.264, and older codecs. Rare or proprietary codecs may not convert successfully.
The FLV output uses H.264 video encoding with AAC audio, which provides the best quality-to-size ratio for Flash-compatible video.
Files up to 50MB are supported. Trim or compress your AVI if the file is larger.
All uploads use HTTPS encryption. Files are automatically deleted from our servers after your download completes — no retention, no sharing.
Most AVI to FLV conversions take 30-90 seconds. Larger files may take a bit longer depending on server load.
Yes. FFmpeg re-encodes the AVI audio as AAC in the FLV container. Common audio codecs in AVI (MP3, PCM, AC-3) are all supported.
Yes, FLV with H.264 encoding supports HD up to 1080p. The output resolution matches your source AVI.
Yes. ChangeThisFile is completely free — no accounts, no subscriptions, and no watermarks.
Related Conversions
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