WMV to FLV Converter

Convert a Windows WMV into an FLV for older Flash workflows and legacy archives. Free, in your browser, with no signup or watermark.

Select WMV 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

FLV is the old Flash Video format, and browsers dropped Flash in 2020, so it now lives mostly in legacy archives and a few older tools that still expect it. Converting WMV to FLV makes sense when a specific old system or Adobe Animate workflow needs that format. For anything you want to watch or share today, MP4 is the better target. EchoWave converts WMV to FLV free 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 WMV to FLV

1
Upload your WMV
Drag your WMV 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

WMV vs FLV

WMV

Windows Media Video

Windows Media video, small and Windows-first

Type: Windows Media video
Holds: Windows Media video with WMA audio
Typical size: Small, built for Windows
Plays on: Windows Media Player and VLC

Best for:Older Windows video and slideshows

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 WMV.
Converting cannot add detail the WMV 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

WMV to FLV questions

Is FLV still worth using?

Mostly only for legacy work. Browsers retired Flash in 2020, so FLV no longer plays on the web by default. Convert WMV to FLV when an older archive, tool, or Adobe Animate project specifically needs it, and use MP4 for anything modern.

Is the WMV to FLV converter free?

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

How do I convert WMV to FLV?

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

What plays an FLV file now?

Since Flash is gone, browsers will not play FLV on their own. VLC opens FLV on every platform, and a handful of older media tools still read it. If you want broad playback, convert WMV to MP4 instead.

Will converting WMV to FLV reduce quality?

WMV is re-encoded for FLV rather than just rewrapped, since the two use different codecs. A high bitrate keeps the picture close to the source. Converting cannot add detail the original WMV never had.

Should I convert WMV to FLV or to MP4?

Choose FLV only when a legacy system insists on it. For playback on the web, phones, social apps, or modern editors, MP4 is the far safer target and you can convert WMV to MP4 from these pages too.

Does the WMV to FLV converter work on Mac, Windows, and Linux?

Yes. The converter runs in any browser, so you can turn WMV into FLV on macOS, Windows, Chromebook, and Linux with nothing to install. To play the result, VLC is the reliable option across all of them.