Filenary

FLV to MP3 Converter

Convert Flash video files to MP3 audio right in your browser — free, private and with no size limit.

Drop your file here

or click to browse

Choose File

On first use, a ~30 MB conversion engine is downloaded to your browser (one time only).

This file is processed in your browser and never uploaded to a server.

How to convert FLV to MP3

  1. 1Drop your FLV file into the box above, or click to choose it from your device.
  2. 2Click Convert. The conversion runs locally in your browser — nothing is uploaded.
  3. 3Download your new MP3 file as soon as it's ready.

Why convert FLV to MP3?

FLV needs Flash, which no longer exists, so most devices can't play it. MP3 plays on every device, car stereo and app, with small file sizes.

Why people make this conversion

Recovers audio from Flash-era webinar and screen recordings while the files still open.

The size math: FLV vs MP3

A minute of FLV video weighs about 8 MB; its soundtrack alone as MP3 is 1.4 MB. Extracting audio shrinks the file about 5.7× smaller.

What is FLV?

FLV is the video format of the discontinued Adobe Flash Player, found in old web video downloads.

  • MIME type: video/x-flv
  • Developed by: Adobe, released 2003
  • Powered the first versions of YouTube (2005–2008)
  • Flash Player died in December 2020, so FLV needs converting

What is MP3?

MP3 is the most popular audio format. It compresses music and speech into small files that play on any device.

  • MIME type: audio/mpeg
  • Standardized: 1993 (MPEG-1 Audio Layer III)
  • Common bitrates: 128–320 kbps
  • Plays on essentially every device made since 1993

Frequently asked questions

Is this FLV to MP3 converter free?
Yes, it's completely free with no sign-up, no watermark and no daily limits.
Are my FLV files uploaded to a server?
No. The conversion happens entirely inside your browser, so your files never leave your device.
Is there a file size limit?
Filenary sets no limit — even files over 1 GB work. The only practical limit is your device's memory.
Will converting FLV to MP3 reduce the quality?
MP3 uses lossy compression, so the file becomes smaller with a small, usually invisible, loss of detail. Settings are tuned to keep the result sharp.
Can I convert several FLV files at once?
This converter handles one file at a time. When it's done, click Start over to convert the next FLV file.
Does it work on iPhone, Android, Mac and Windows?
Yes. It runs in any modern browser — Chrome, Safari, Edge or Firefox — on phones, tablets and computers, with nothing to install.

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Add this tool to your website

Copy the code below and paste it into any page. It's free, needs no sign-up, and files are processed in your visitors' own browsers.