FLV to SWF Converter

Move a legacy FLV clip into the SWF Flash format in your browser, free, with no signup and no watermark.

Select FLV file →

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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 and SWF are both Flash-era formats from the days of Adobe Flash Player. FLV is the streaming video container that powered the early web, while SWF is the Flash file that held animations, banners, and games. EchoWave converts FLV to SWF in your browser, free and with no signup, so you can keep an old clip inside the Flash family for an archive or a legacy workflow.

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 SWF

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

The formats

FLV vs SWF

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

SWF

Shockwave Flash

Adobe Flash animation, now retired

Type: Flash animation
Holds: Vector animation and ActionScript
Typical size: Small for vector artwork
Plays on: Nothing by default, Flash was retired in 2020

Best for:Old Flash animations and games

Will it lose quality?

When the codecs already match SWF, the converter can change the container without re-encoding, so the picture stays identical.
When the video has to be re-encoded for SWF, 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 SWF 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 SWF questions

Is the FLV to SWF converter free?

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

How do I convert an FLV file to SWF?

Upload your FLV, choose SWF as the output format, and start the conversion. When it finishes, download the SWF to your device, or open the clip in the editor first if you want to trim or resize it.

What can open an SWF file in 2026?

Adobe retired Flash Player at the end of 2020, so SWF files no longer run in normal web browsers. Today most people open them with Ruffle, an open-source Flash emulator, or with archived standalone Flash players kept for preservation work.

Should I convert FLV to SWF or to a modern format instead?

If your goal is everyday playback, MP4 or WebM is the better target because they play on phones, browsers, and TVs without any Flash software. Convert to SWF only when a legacy system, archive, or Flash-based project specifically needs the SWF format.

Will converting FLV to SWF reduce the quality?

The SWF can only be as good as the picture already inside your FLV, and converting cannot add detail the source never had. EchoWave keeps the output as close to the original as the formats allow.

Does the converter work on Mac and Windows?

Yes. The converter runs in any browser on macOS, Windows, Chromebook, and Linux. There is nothing to download and no account to create.

Can I convert FLV to SWF on iPhone or Android?

Yes. The converter runs in your mobile browser, so you can convert FLV to SWF on iPhone, iPad, and Android. Note that playing an SWF back on a phone usually needs a Flash emulator such as Ruffle.

Why does my old FLV file no longer play in a browser?

FLV relied on Adobe Flash Player, which every major browser dropped in 2020. The file itself is fine, the player is gone, so you now open FLV in VLC or convert it to a current format to watch it.