Add your files
Drop one FLV or two hundred. Batch conversion is not a paid feature here.
Convert FLV to MP4
An old lecture recording, webinar archive or downloaded video is FLV, and Flash has been dead since 2020.
Runs on your deviceFreeNo sign-upBatch supported
Where the streams already fit the target container this is a lossless remux, which is close to instant. Otherwise it re-encodes, which in a browser is slow — keep it under a few hundred MB and send long videos to the cloud engine.
Waiting for files/Engine: on-device/Network requests made: 0
What actually changes
FLV and MP4 are not the same picture in two wrappers.
Most FLV files already contain H.264 video and AAC audio, in which case the streams are copied into an MP4 container without re-encoding. Older ones carry Sorenson Spark or VP6 and have to be fully transcoded.
Worth knowing first
FLV from the Sorenson and VP6 era is usually 320 by 240 or similar. Converting cannot add detail, and upscaling it to 1080p just makes the softness larger. Keep the original resolution.
Questions
FLV to MP4, answered
Is FLV the same as F4V?
No. F4V is Adobe's later MP4-based container, and it converts even more cleanly because it is already ISO base media.
Can I still play FLV files at all?
VLC and MPV will play them. Almost nothing else will, which is why converting is worth doing before the files are needed urgently.
How to convert FLV to MP4
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Choose your settings
MPEG-4 Video is lossy, so the quality control decides the trade between size and fidelity.
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Download
Instant, because the file never went anywhere. Nothing expires, since nothing was stored.