MP3 to FLV Converter

Wrap your MP3 in an FLV video for legacy Flash-era systems that still call for it. Free, in your browser, with no signup.

Select MP3 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, the format that carried web video before browsers dropped Flash at the end of 2020. Converting MP3 to FLV wraps your audio in that legacy container for an old system or archive that still expects it. The audio is kept intact, but for anything modern, MP4 or WebM are the formats to reach for instead.

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 MP3 to FLV

1
Upload your MP3
Drag your MP3 onto the converter or pick it from your device. Nothing to install.
2
Choose FLV and convert
Select FLV as the output. Your audio is placed into a video with a clean background.
3
Download your FLV
Save the FLV ready to upload, or open it in the editor to add a cover image 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

MP3 vs FLV

MP3

MPEG-1 Audio Layer III

The most universal audio format ever made

Type: Lossy audio format
Holds: Audio only
Typical size: Small, about 1 MB per minute at 128 kbps
Plays on: Effectively everything

Best for:Music, podcasts, and audio you listen to

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 look and sound right?

Your audio is kept at full quality inside your new FLV video, so nothing is lost from the sound.
The picture is a simple visual because the source is audio only. Add a cover image or waveform in the editor for a richer look.
A longer track makes a larger video, since the file carries a picture for every second.

Use cases

What people use it for

MusiciansPost tracks to video sites

PodcastersPublish episodes on YouTube

TeachersShare a lesson as video

CreatorsMake an audiogram to share

SocialUpload where video is required

Troubleshooting

If something looks off

The video is just a still image

That is expected, since the source is audio only. Open the FLV in the editor to add a cover image, logo, or animated waveform.

It will not upload to YouTube or Instagram

Most sites want MP4. Convert to MP4 for the widest support, then upload the video file.

The file is large

Video files are bigger than audio because they store a picture for every frame. A shorter track or a plain background keeps the size down.

FAQ

MP3 to FLV questions

Is the MP3 to FLV converter free?

Yes. EchoWave converts MP3 to FLV with no signup, no file-count limit, no trial, and no watermark. Upload your MP3, convert it, and download the FLV from your browser.

How do I convert MP3 to FLV?

Upload your MP3, choose FLV as the output, and start. Your audio is placed in a video with a plain background, and you can download the FLV when it finishes or open it in the editor to add a cover image.

Why would I still need an FLV file?

FLV is a legacy format, so you would convert to it mainly for an old Flash-based system, a media server, or an archive that was built around it. For new uploads and the modern web, FLV is no longer the right tool.

Does an FLV from my MP3 still play in browsers?

Not on its own. Browsers removed Flash support at the end of 2020, so FLV no longer plays inline on the web. VLC and a few legacy players still open it on the desktop.

What should I use instead of FLV?

For anything current, convert to MP4 or WebM instead. Both play in modern browsers and on phones, while FLV is best left to systems that specifically require it.

What does the video show if my MP3 has no image?

The FLV plays a plain background, since the source is audio only. You can add a cover image, logo, or waveform in the editor if you want something on screen.

Is the audio quality kept when I convert MP3 to FLV?

Your audio sits inside the FLV at full quality, so the sound itself is not degraded. The picture is just a simple visual, because an MP3 carries no video.

Does the MP3 to FLV converter work on iPhone, Android, Mac, and Windows?

Yes. The converter runs in any browser, so you can convert MP3 to FLV on iPhone, iPad, Android, macOS, Windows, Chromebook, and Linux with nothing to install.

Can I convert several MP3 files to FLV?

Yes. There are no file-count limits on these pages, so you can convert your MP3s to FLV one after another. Longer clips simply take a little more time.