FLV to M4A Converter

Extract Audio from FLV to M4A Online

Pull the audio track out of an old FLV (Flash Video) file and save it as a modern M4A. Because Adobe Flash Player reached end-of-life on December 31, 2020, FLV files no longer play in any current browser — so for an archived web clip, a downloaded lecture, or a podcast recording stuck in FLV, extracting the audio into M4A is often the only practical way to keep it listenable. The video is discarded; you keep just the sound, in an AAC-in-MPEG-4 file that plays on iPhone, Mac, Android, and every modern player.

How to Convert FLV to M4A

1. Upload Your FLV File: Drag and drop your .flv file onto the page or click "+ Add Files." You can queue several clips and extract them all in one batch.
2. Set the Quality Preset: M4A defaults to the AAC codec. Leave Quality Preset on "Very High (Recommended)" for near-source sound, or open Custom Bitrate / Constant Bitrate to pin an exact target such as 192 or 256 kbps.
3. Tune Channels, Sample Rate, or Trim (Optional): Use Audio Channel (Original / Stereo / Mono) and Audio Sample Rate to match the source, or Trim to clip out just the segment you want.
4. Convert and Download: Click "Convert" and save your M4A. No sign-up, no watermark.

FLV vs M4A: What You Keep and What You Lose

Because FLV audio is already a lossy stream (MP3 or AAC) and M4A re-encodes to AAC, you are going lossy-to-lossy — expect a small amount of generational quality loss. Choosing a high bitrate (192 kbps or above) keeps it inaudible in practice. If you want the most universally compatible result instead, convert FLV to MP3; if you would rather keep the picture, convert FLV to MP4 and keep both streams playable.

Frequently Asked Questions

Why won't my FLV file play anymore?

FLV relied on Adobe Flash Player, which Adobe ended support for on December 31, 2020, and began actively blocking on January 12, 2021. No mainstream browser ships a Flash runtime today, so the container itself is effectively dead for playback. The media inside is usually fine — extracting the audio to M4A (or the video to MP4) is how you recover content that's otherwise trapped.

Will I lose audio quality converting FLV to M4A?

Some, but typically not enough to hear. FLV almost always stores audio as MP3 or AAC, both of which are already lossy, and M4A re-encodes that to AAC — so it's a second lossy pass (generational loss). In our testing, exporting a typical 128 kbps FLV audio track at the "Very High" preset produced an M4A that was hard to tell from the source on consumer speakers. Pick 192 kbps or higher under Custom Bitrate if you want maximum headroom.

What's the difference between M4A and the MP3 I'd get from the same file?

Both are lossy, but they use different codecs. M4A wraps the AAC codec, the MPEG-declared successor to MP3 (standardized in 1997); AAC is generally more efficient, so AAC at 128 kbps is roughly perceptually equivalent to MP3 at 160-192 kbps. M4A is the better choice for Apple devices and modern players; choose MP3 only if you need the broadest possible compatibility with very old hardware.

Can I set an exact bitrate or trim the clip first?

Yes. Open Advanced Options: Custom Bitrate and Constant Bitrate let you lock a value like 256 kbps, Audio Channel and Audio Sample Rate let you downmix or resample, and Trim lets you keep only a chosen start point and duration so you're not encoding silence or unwanted sections.

Is the upload private?

Yes. Your file is uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public. The main practical limit on a very large FLV is upload time, not your device.