FLV → MP3

Yes, and it is worth planning around. Both formats are lossy, so the MP3 encoder is working from audio that has already been through one psychoacoustic pass, and its own decisions compound the first set. At 192 kbps or above the result is still transparent for most listening. If you have a lossless master anywhere, encoding the MP3 from that instead avoids the double pass entirely. FLV typically holds Sorenson Spark or H.264 video with MP3 or AAC audio, wrapped in a stream format designed for RTMP delivery. MP3 is lossy: a psychoacoustic model discards frequencies the ear is unlikely to notice, typically at 128 to 320 kbps.

Yes, and it is a genuine gain over FLV, which has nowhere dependable to store any of it. MP3 carries title, artist, album, year, track number and embedded cover art in the container itself, so a music library files it correctly without a manual pass. Nothing beats MP3 for compatibility — car stereos, gym equipment, DAPs and twenty-year-old hardware all read it without question.

A lossy MP3 is encoded at 192 kbps by default. The Audio Quality setting also offers 320 kbps for the best quality and 128 kbps for a smaller file. A lossless MP3 (WAV, FLAC) ignores the bitrate and keeps every sample.

If MP3 is lossless (WAV, FLAC), every sample is preserved exactly. If MP3 is lossy (MP3, AAC, OGG, Opus), the MP3 codec recompresses the source audio — at 192 kbps the result is transparent for almost all content. Going lossy → lossless never recovers detail already discarded.

Several files in one job need a paid plan. Free use is one file per conversion, one conversion an hour. On a paid plan you can add several files to one job, then download each result on its own or all of them in one ZIP.

It depends on the size and length of the file. Small documents and images are usually ready quickly. Long videos take the longest, because most video conversions re-encode every frame.

Not in this tool directly — extract the full audio as MP3, then use /audio-trim/ or /audio-cutter/ to clip the section. The two-step path is usually faster than a combined operation and gives you precise waveform-level control.

Yes. Uploaded FLV files are processed on our own conversion servers, no person reviews them, and they are never shared. The upload and the converted MP3 are both deleted automatically about 24 hours after the conversion, which leaves time to download the result. See /privacy/ for the full policy.

Usually the FLV carries more than one audio track and the one that was converted is silent or secondary. The converter picks one audio track automatically, normally the main one, and this page has no setting to choose a different track. If the wrong one comes out, remux the FLV with the track you want first (VLC or ffmpeg can do this) and convert it again.