Video conversion
Convert FLV to AAC
Updated Jul 2026
FLV is the old Flash Video format many sites used before Flash was retired, and AAC is a compact audio format that plays on iPhones, Macs, and most music apps. Converting FLV to AAC pulls the audio track out of the video and saves it on its own. Doing this on your own computer means the video file never has to leave your machine.
- Extension
- .flv
- Type
- Video
- Typically
- Legacy web video
- Compression
- Lossy
- Extension
- .aac
- Type
- Audio
- Typically
- Apple / streaming audio
- Compression
- Lossy
Convert FLV to AAC on your own computer. Nothing uploads.
How to convert FLV to AAC
- Open Morphjet and drag in the FLV file, or a whole folder of them, to convert several at once.
- Choose AAC as the output. Morphjet reads the audio track out of the video automatically.
- Convert. The AAC file is written next to your original, the video is left untouched, and nothing leaves your machine.
FLV vs AAC: what actually changes
| FLV | AAC | |
|---|---|---|
| Contains video | Yes | No, audio only |
| File size | Larger, stores video and audio together | Much smaller, since only the audio remains |
| Plays on | Needs a Flash-era player or an old browser plugin most systems no longer have | iPhone, Mac, Windows, and nearly any music app |
| Quality | Lossy, using older, less efficient codecs | Lossy, but efficient enough that quality holds up well at smaller sizes |
| Song or track tags (title, artist) | No, FLV isn't built to carry music metadata | Yes, AAC files can carry title and artist tags |
When to convert, and when not to
Convert FLV to AAC when you have an old Flash video and only want the audio, like a song, interview, or lecture, and want it as a normal audio file you can play on a phone or add to a music library.
Keep the FLV if you still need the video itself, since converting to AAC keeps only the sound and discards the picture for good.
Why not just use an online converter?
FLV files are relics of an era before most video hosting sites, and they can contain anything from home movies to recorded calls. Uploading one to an online converter just to pull out the audio means a stranger's server sees the whole video first. Converting on your own computer means the footage stays put and only the audio you asked for gets written to disk.
Questions
Does converting FLV to AAC lose quality?
The audio track is re-compressed into AAC, so there's a small amount of loss, but it's usually not noticeable for speech or everyday listening. If the original FLV had a rough, low-bitrate audio track to begin with, the AAC won't sound better than that.
Will I still have the video after converting to AAC?
Not from the AAC file itself. Converting only pulls out the audio track, the picture is dropped entirely. Your original FLV is left alone, though, so you still have the video there if you keep it.
Is FLV still a common format?
Not really. FLV was built for Flash-based video players, and since Flash was retired, most browsers and modern devices don't play FLV directly anymore, which is part of why people end up converting FLV files at all.
Can I convert FLV to AAC without uploading the video anywhere?
Yes. A desktop app like Morphjet reads the FLV and writes the AAC on your own computer, so the video never has to go over the internet.
Morphjet converts FLV, AAC, and 1,800+ other formats, all on your machine. Launching this July.