FLV to AVI Converter

Move old Flash video into AVI for legacy Windows players and editors. Convert FLV to AVI free in your browser, with no signup and no watermark.

Select FLV file →

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Click or drag and drop to upload files

We support most file types including: MP4, MOV, WEBM, AVI, MP3, WAV, PNG, JPEG, GIF, MKV, PDF, FLAC, TIFF!

EchoWave is used by creators, marketers, educators, and businesses to convert and edit media online.

Updated June 2026

Both FLV and AVI are older containers, but they suit different worlds: FLV came from the Flash web that browsers retired in 2020, while AVI is Microsoft's long-standing format from Video for Windows. Converting FLV to AVI is the move when a legacy Windows player or an older editing tool expects AVI and refuses to open a Flash file. It runs in your browser with no signup.

Free, no sign-upNo account, no trial

Runs in your browserNothing to install

Works on every devicePhone, tablet, laptop

No watermarkClean output, every time

How it works

How to convert FLV to AVI

1
Upload your FLV
Drag your FLV onto the converter or pick it from your device. Nothing to install.
2
Choose AVI and convert
Select AVI as the output and start. Free, with no sign-up and no watermark.
3
Download your AVI
Save the finished AVI, or open it in the editor to trim, crop, or resize it first.

Try it

Estimate your AVI

Pick a video bitrate and a length to see the AVI file size before you convert.

Video bitrate

Length5 min

1 min30 min

Estimated AVI size183MBSharp 1080p

An estimate. Real size varies with resolution, frame rate, and how much the picture moves.

The formats

FLV vs AVI

FLV

Flash Video

Legacy Flash video from the pre-HTML5 web

Type: Flash video container
Holds: H.263, VP6, or H.264 video with MP3 or AAC audio
Typical size: Small, made for streaming
Plays on: VLC, since browsers dropped Flash in 2020

Best for:Recovering old Flash web video

AVI

Audio Video Interleave

A legacy Microsoft video container

Type: Legacy video container
Holds: Older codecs like DivX or Xvid with MP3 or PCM audio
Typical size: Large for the quality it gives
Plays on: Windows and VLC, patchy on phones

Best for:Playing older Windows video files

Will it lose quality?

When the codecs already match AVI, the converter can change the container without re-encoding, so the picture stays identical.
When the video has to be re-encoded for AVI, a high bitrate keeps it visually close to the FLV.
Converting cannot add detail the FLV never had. The output is at best as good as the source.

Use cases

What people use it for

Play anywhereMake a clip your device supports

Video editorsGet footage your software accepts

Web videoUse a format browsers play

CourseworkHand in a standard video file

SharingSend a clip people can open

Troubleshooting

If something looks off

The AVI will not play

Some players are picky about codecs. Try it in VLC, which opens almost anything, or convert again and let the converter re-encode the video.

The file got larger

A format change can shift the size, and re-encoding at a high bitrate adds overhead. Lower the bitrate or trim the clip for a smaller file.

Audio and video drift out of sync

Re-download the source and convert again. If a long recording drifts, splitting it into shorter pieces usually fixes the sync.

FAQ

FLV to AVI questions

Why convert FLV to AVI?

Some older Windows players and editing tools were built around AVI and will not open the Flash container. If your workflow or device specifically asks for AVI, converting FLV to AVI gives you a file it can read, since Flash playback itself was retired in 2020.

Is the FLV to AVI converter free?

Yes. EchoWave converts FLV to AVI with no signup, no file-count limit, no trial, and no watermark. Upload your FLV, convert it, and download the AVI from your browser.

How do I convert FLV to AVI?

Upload your FLV, choose AVI as the output format, and start. When it finishes, download the AVI or open it in the editor to trim, crop, or resize the clip first.

Will converting FLV to AVI reduce quality?

The AVI is at best as good as the source FLV, and converting cannot add detail the original never had. When the video has to be re-encoded for AVI, a high bitrate keeps the result close to the Flash original.

Should I use AVI or MP4 for old Flash video?

Pick AVI only when a specific legacy player or editor requires it. For everyday playback, sharing, and uploading, MP4 is the better target: it is smaller for the same quality and far more widely supported than AVI today.

Why are AVI files often large?

AVI uses older codecs and adds more container overhead than modern formats, so it tends to be large for the quality it gives. If file size matters, convert to MP4 instead, or lower the bitrate and trim the clip before exporting.

Does it work on Mac, Windows, iPhone, and Android?

Yes. The converter runs in any browser on macOS, Windows, Chromebook, Linux, iPhone, iPad, and Android with nothing to install. AVI plays best on Windows and in VLC, and can be patchy on phones.

Can I convert large FLV files or several at once?

Yes. There are no file-count limits on these pages, so you can convert your old Flash videos one after another. Large files are supported and simply take a little longer to upload and convert.