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FLV to AVI Converter

Convert FLV to AVI online for free. Fast, secure, and high-quality conversion with no sign-up or software required.

  • Free to use
  • No file stored beyond 1 hour
  • Encrypted over TLS 1.2/1.3
  • No watermarks

Drag and drop your files here or click to upload.

Maximum file size is 1GB

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How it works

Three steps to your converted file

Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.

  1. 01

    Upload your file

    Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.

  2. 02

    Choose an output format

    Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.

  3. 03

    Convert & download

    Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.

FLV to AVI

Why convert FLV to AVI?

FLV and AVI are both lossy formats.

  • Where AVI works best

    Older Windows video files.

FLV vs AVI: what's the difference?

PropertyFLVAVI
TypeVideoVideo
CompressionLossy (smaller files, some quality loss)Lossy (smaller files, some quality loss)
Opens inVLC; browsers dropped Flash in 2020Windows players and VLC; not iPhone or most browsers
Best forOld Flash web videosOlder Windows video files

What is an FLV file?

Flash Video

Developed By
Adobe Systems
Initial Release
2002
MIME Type
video/x-flv

The FLV (Flash Video) format is a container file format defined by Adobe Systems for delivering synchronized audio and video over the internet via the Adobe Flash Player. It supports various codecs, historically Sorenson Spark and VP6, and later H.264 (MPEG-4 AVC) and AAC audio. FLV files were the dominant standard for web-based streaming video (YouTube, Hulu) during the 2000s, utilizing the RTMP (Real-Time Messaging Protocol) for transmission before being superseded by HTML5 standards.

How to open an FLV file

Since the End-of-Life (EOL) of Adobe Flash Player in 2020, browsers no longer support FLV natively. To play local FLV files, users must utilize third-party media players that maintain legacy codec support, such as VLC Media Player, MPC-HC, or MPV. For editing or conversion, tools like OBS Studio and HandBrake utilize the FFmpeg library to decode and process the container.

What is an AVI file?

Audio Video Interleave

Developed By
Microsoft
Initial Release
1992
MIME Type
video/x-msvideo

Audio Video Interleave (AVI) is a multimedia container format introduced by Microsoft in 1992 as part of the Video for Windows technology. It adheres to the Resource Interchange File Format (RIFF) specification, storing audio and video data in tagged chunks (specifically 'movi' lists) to allow synchronous playback. While widely compatible, the legacy AVI architecture lacks native support for modern features found in MP4 or MKV, such as variable frame rates (VFR), B-frames, and sophisticated chapter markers. It typically utilizes codecs like DivX, Xvid, or MJPEG.

How to open an AVI file

AVI files enjoy broad compatibility on Windows via Windows Media Player. However, because AVI is a container that can hold various codecs (e.g., DivX, Xvid), playback may fail if the specific codec is missing. macOS users can view AVI files using QuickTime Player if the content is MJPEG, but third-party players are often required for other codecs. VLC media player and MPC-HC are standard recommendations for handling the vast array of codecs potentially encapsulated within an AVI file.

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Why RunConvert

The fastest way to convert any file

Purpose-built for speed, privacy, and breadth of format support.

  • Convert FLV to AVI in seconds

    Every FLV to AVI conversion runs on our servers, so your device stays fast and the output quality stays intact.

  • Fast, cloud-powered

    No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.

  • Secure & private

    Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.

  • Free - no account needed

    Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.

Developer API

Convert FLV to AVI via API

Automate FLV to AVI conversions in three steps: create a job, upload your file, then poll for the result.

Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.

# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tag": "flv-to-avi",
    "tasks": {
      "upload-file": {
        "operation": "import/upload"
      },
      "convert": {
        "operation": "convert",
        "input": "upload-file",
        "output_format": "avi"
      },
      "export-result": {
        "operation": "export/url",
        "input": "convert"
      }
    }
  }'

# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.flv

# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
  -H "Authorization: Bearer YOUR_API_KEY"

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