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Convert FLV to MP4

FLV to MP4 conversion runs in the TeraConvert desktop app, fully local on your Mac. Drop a file below to see what the free browser converter can do with it.

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How to Convert FLV to MP4

  1. 1

    Get TeraConvert for Mac

    Free download for Apple Silicon; this format needs Pro.

  2. 2

    Drop your FLV files

    One file or a whole batch at once.

  3. 3

    Pick MP4 and convert

    Everything runs locally; nothing is uploaded.

Why Convert FLV to MP4?

FLV is the container Flash video shipped in, and Flash has been dead since 2020, so the file plays in almost nothing made this decade. MP4 with H.264 plays everywhere: phones, browsers, editors, smart TVs.

Converting rescues old screen recordings and downloaded clips from a format the web walked away from.

FLV
MP4
Container
Flash Video (FLV)
Container
MP4 (ISOBMFF)
Typical codec
H.263 / VP6 / H.264
Typical codec
H.264 / H.265
Audio codec
MP3 / AAC
Audio codec
AAC
Streaming friendly
Legacy only
Streaming friendly
Yes
Device support
Obsolete
Device support
Universal
Typical use
Old web video
Typical use
Web, mobile, TV

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Frequently Asked Questions

Can I convert FLV to MP4 in the browser?
No. Browsers ship no FLV demuxer, so this pair runs in the desktop app through FFmpeg. It is still 100% local; nothing is uploaded.
Will converting FLV to MP4 improve the video quality?
No. The FLV was encoded once already, and re-wrapping or re-encoding it cannot add detail that was never captured. You get a modern, playable file, not a sharper one.
What codec is inside a typical FLV?
Usually Sorenson H.263 or On2 VP6, and sometimes H.264 on later files. FFmpeg reads all of them and re-encodes to H.264 in the MP4 so the result plays natively.
My FLV has audio sync drift. Does converting fix it?
Often, yes. Re-encoding rebuilds the container timestamps from scratch, which resolves the audio drift some old FLV files develop during playback.
Is my file still private in the desktop app?
Yes. The desktop app converts with native engines on your Mac and works offline after a one-time activation check. Nothing is uploaded, in the browser or on desktop.

Converting a folder of old FLV clips?

TeraConvert Desktop converts FLV files of any size to MP4 through native FFmpeg, batch included.

Get TeraConvert for MacFree to download. This format unlocks with Pro.