Step 1: Provide your FLV files using the button above or by toss and let go.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Fetch your converted MP3 files.
FLV to MP3 Conversion FAQ
How do I extract just the audio track from FLV as MP3?
+
Upload the FLV file and the converter demuxes the audio stream from the FLV container, then transcodes it into MP3. Video frames are discarded — no second video pass, no quality loss beyond what the MP3 codec itself introduces. FLV is the Flash Video container that carried essentially all web video from roughly 2003 until Flash was switched off at the end of 2020. MP3 is MPEG-1 Audio Layer III, finalised in 1993, and still the most universally decodable audio format that exists.
Is converting FLV to MP3 a second round of lossy compression?
+
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.
Can I tag the MP3 with artist and album information?
+
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.
Which audio track gets extracted when my FLV has several?
+
One track, picked automatically: normally the main one, the track with the most channels. This page has no setting to choose a different track and does not list the tracks in the file. If you need commentary or a dub instead, remux the FLV with that track first (VLC or ffmpeg can do this) and convert it again.
What bitrate does the MP3 file use?
+
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.
Will going from FLV to MP3 reduce my audio quality?
+
If the MP3 format is lossless (WAV, FLAC, ALAC), every original sample is preserved. If MP3 is lossy (MP3, AAC, OGG, Opus), the codec recompresses — at 192 kbps the difference is inaudible for most content; at 96 kbps you may hear cymbals or sibilants softening. The FLV container has no influence on this — only the codec settings matter.
Does the extracted MP3 keep the FLV sample rate?
+
By default yes — 48 kHz FLV audio becomes 48 kHz MP3 audio, 44.1 kHz becomes 44.1 kHz. If you need to downsample for compatibility (e.g. 96 kHz studio masters to 44.1 kHz CD-quality MP3) the sample-rate dropdown does this with high-quality resampling.
Can I batch-extract MP3 audio from a folder of FLV files?
+
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.
How long does extracting MP3 from a 1-hour FLV take?
+
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.
Is my FLV private during audio extraction?
+
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.
Why does my MP3 have silent gaps or wrong audio?
+
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.
