Converting FLV to M4A gives you the same content in a different container. It runs in your browser: nothing is uploaded, there is no queue and no size limit.
What changes when you convert FLV to M4A
- Both FLV and M4A are lossy. Every re-encode discards a little more detail, so convert from the original when you can and keep the quality setting at 85 or above.
- Only the audio track is kept. The video stream is discarded entirely, which is the point.
When to convert, and when not to
Convert to M4A for Apple devices and streaming. AAC audio in an MP4 container. Apple's default; better than MP3 at the same bitrate.
Keep FLV for nothing new, so convert it. Flash video. Obsolete, but still found in old archives.
How to convert FLV to M4A
- Drop your FLV file on the converter above, or click to choose. Several at once is fine.
- Check the options if you need them: audio bitrate.
- Click Convert, then Download. Nothing was sent anywhere, your browser did the work.
Questions
Is my FLV file uploaded?
No. The conversion runs in your browser with WebAssembly. There is no upload endpoint on this site. You can open your browser's Network tab, or go offline after the page loads, and it still works.
Is there a file size limit?
No fixed one. The limit is your device's memory: a large video file on a phone is slower than on a laptop, but nothing is rejected for being big.
Is it free?
Yes, without an account, without a daily cap and without a watermark. Your device does the computing, so there is no server bill to pass on.
Will the quality drop?
M4A is lossy, so a little detail is traded for a smaller file. At quality 85 the difference is invisible on photos. For graphics with sharp edges, prefer a lossless format such as PNG.
Can I convert several files at once?
Yes. Drop them all; each is converted in turn and you can download them one by one or as a single ZIP.
Which engine does the conversion?
Media engine (FFmpeg, multithreaded WebAssembly), compiled to WebAssembly and running in your browser, on all your CPU cores when the browser allows it. First use downloads about 31 MB, cached afterwards.