AVI to FLV Converter

Convert AVI video into FLV for legacy Flash players and older workflows. Free, in your browser, with no signup and no watermark.

Select AVI file →

Rated 4.5 / out of 5 by Video Creators on

Choose Files

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

FLV is Flash Video, a format from the pre-HTML5 web. Adobe retired Flash at the end of 2020, so FLV is now a legacy target you would pick only for an old player, an archive, or a system that still asks for Flash video. If you want modern playback, MP4 is the better choice. The converter is free, runs in your browser, and adds no watermark.

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 AVI to FLV

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

Try it

Estimate your FLV

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

Video bitrate

Length5 min

1 min30 min

Estimated FLV size183MBSharp 1080p

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

The formats

AVI vs FLV

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

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

Will it lose quality?

When the codecs already match FLV, the converter can change the container without re-encoding, so the picture stays identical.
When the video has to be re-encoded for FLV, a high bitrate keeps it visually close to the AVI.
Converting cannot add detail the AVI 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 FLV 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

AVI to FLV questions

Is the AVI to FLV converter free?

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

Why would I still convert AVI to FLV?

FLV mainly makes sense for legacy needs: an older player, a Flash-era archive, or a tool that specifically expects Flash video. For sharing, uploading, or modern playback, MP4 is almost always the better target.

How do I convert AVI to FLV?

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

Do browsers still play FLV after Flash was retired?

No. Browsers dropped Flash support at the end of 2020, so FLV no longer plays on the web by default. VLC still opens FLV on the desktop, which is the simplest way to check a converted file.

What opens an FLV file today?

VLC is the most reliable player for FLV, and a few other desktop players support it. If you need something that plays anywhere, convert to MP4 instead, which works in every browser and on every phone.

Will converting AVI to FLV lose quality?

FLV conversion re-encodes the video, and a high bitrate keeps the result close to the source. Converting cannot add detail the original AVI never had, so the FLV is at best as good as your source file.

Can I convert AVI to FLV on Mac and Windows?

Yes. The converter runs in any browser on macOS, Windows, Chromebook, and Linux, so you do not need an old Flash encoder or desktop converter installed. There is nothing to download and no account to create.

Is there a file size or count limit?

No. There are no file-count limits on these pages, so you can convert one AVI after another. Large recordings are supported too and simply take a little longer to upload and convert.

Is it safe to convert AVI to FLV here?

Converting an old AVI clip into a legacy Flash file does not require a login or any desktop encoder, and you never have to dig out an aging Flash authoring tool. Our security page explains how the AVI you upload and the FLV you download are handled.