FLV to MP3

Convert FLV to MP3 in three steps

1. Choose one or more FLV files, or try the included sample.
2. Pick your MP3 bitrate and press Convert to MP3. Keep this tab open while it works.
3. Listen to the preview and save individual files or download the batch as a ZIP.

When FLV to MP3 is the right move

FLV is the Flash Video container that web video used before HTML5, and you will meet it in archived web videos, old lectures, and screen recordings from the Flash era. MP3 plays in every car stereo, phone, podcast host, and upload form, so converting closes the gap between the file you have and the tool you need. Everything stays on your device while it runs, so private recordings never reach a server.

What happens to the audio inside

The converter opens the FLV file and reads the primary audio track, usually MP3 or AAC and sometimes a speech codec. It decodes that audio and writes an MP3 at the bitrate you choose, which is small enough to email. The picture is ignored, so the MP3 contains sound only. Converting FLV audio to MP3 is a second lossy step for most sources, so match or exceed the source quality instead of going lower.

Size and settings

A 192 kbps MP3 uses about 1.4 MB per minute. Choose 128 kbps for speech, 192 kbps as the all-round default, and 256 or 320 kbps for music you plan to keep. The sample rate and channel layout of your FLV file are carried across, so a mono recording stays mono.

Troubleshooting and tips

Some very old FLV files use speech codecs such as Nellymoser, which decode but sound narrow. That is how the recording was made, and no converter can add the missing detail. The first conversion of this format downloads an extra decoder of about 30 MB, and your browser keeps it for later. Only the decoder is downloaded. Your file is never uploaded. Convert a short file first to confirm that your browser can decode it, then run the rest as a batch and download the ZIP. Keep the original FLV until you have listened to the MP3 from beginning to end.