FLV to MP3 Converter – Free Online

How to Convert FLV to MP3 Online

Drop your FLV file

Drag and drop your .flv file onto the box above, or click Choose Files. The request is already filled in: “Convert this to MP3”.

Say how, if you want

The AI assistant uses sensible defaults. To choose the bitrate, codec or sample rate yourself, say so in the request, for example “Convert this to MP3 at 320 kbps”.

Save your MP3 file

The assistant opens with your file and converts it on your own device; the file itself is never uploaded. When the MP3 file is ready, click Save. Prefer to set everything by hand, or batch-convert several files into a ZIP? The classic converter is one click away on this page.

Why Convert FLV to MP3?

FLV files are what remains of the Flash era: saved web videos, early video-site downloads, webinar and screencast archives, and recordings from older streaming software. Browsers and phones no longer play them, but the audio, whether a talk, a song or an interview, is often the part worth keeping, and an MP3 is the simplest way to keep it.

Older FLVs usually carry MP3 audio and later H.264 ones AAC. Either way the converter decodes the track with FFmpeg running in your browser and encodes a fresh MP3, so the video codec inside the FLV (Sorenson Spark, VP6 or H.264) makes no difference to the result.

Private by design: your FLV file is converted on your own device and never uploaded.
MP3 already asked for: the AI assistant's request says MP3, so one drop does it. Want a particular bitrate, codec or sample rate? Just say so.
Batch friendly: the classic converter on this page takes several FLV files in one go and downloads them as a ZIP.
Free, no watermark: no sign-up, and nothing stamped on the output.

FLV vs MP3

FLV (Flash Video): FLV (Flash Video) was the streaming format of the Flash era. Modern browsers no longer play it, so FLV files usually need converting before they can be watched or edited. It is best for legacy Flash-era archives.

MP3 (MPEG-1 Audio Layer III): MP3 is the universal lossy audio format. It plays on every device made in the last twenty-five years and offers small files with good quality at 192 to 320 kbps. It is best for music players, podcasts, phones and sharing.

In short: keep FLV when the priority is legacy Flash-era archives, and switch to MP3 when the file is headed for music players, podcasts, phones and sharing. Need a different target? The full Video Converter supports every format listed below.

FLV to MP3 FAQ

My FLV already has MP3 audio. Is it passed straight through?

No. The converter always decodes and re-encodes the track, even when it is MP3 already. Leave the bitrate at its default, the source's own (the classic converter's audio bitrate slider at 100%), so the extra encode stays inaudible.

Can I convert FLV recordings from OBS or other streaming software?

Yes. Those FLV files normally hold H.264 video with AAC audio, and only the audio is decoded for the MP3, so they convert like any other FLV.

Is this FLV to MP3 converter free?

Yes. Converting FLV to MP3 on MediaConverter.io is free, with no watermark and no sign-up. The AI assistant runs on a free daily allowance of assistant credits; the classic converter on this page has no daily limit at all.

Are my FLV files uploaded to a server?

No. The conversion runs inside your browser using FFmpeg compiled to WebAssembly, so your .flv file is read and converted on your own device and never uploaded, which keeps private recordings private and means there is no waiting in an upload queue. The AI assistant only sees what you type and basic facts about the file: its name, format, duration and size.

Is there a file size limit for FLV to MP3?

There is no plan or account limit, but the converter loads the whole FLV file into your browser's memory, so about 2 GB per file is the practical ceiling; larger files may fail to open. Long or high-resolution files also take longer, especially on phones.

Can I choose the MP3 settings myself?

Yes. Ask the AI assistant for a bitrate, codec or sample rate in your request. Audio track selection and every other setting are in the classic converter, one click away on this page.

Will converting FLV to MP3 reduce quality?

MP3 is a lossy format, so the FLV audio is decoded and re-encoded. Keep the bitrate at 100% (or pick 256 to 320 kbps) and the difference is inaudible for almost all listeners.

Which browsers support the FLV to MP3 converter?

It is built and tested on current desktop Chrome and Edge. The conversion itself runs in WebAssembly, which every current desktop browser supports, so speed depends mostly on your computer's processor.