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FLV MP4
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Convert FLV to MP4

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Verified by Adam B.· reviewed by FE Editorial ·updated Jul 1, 2026
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Is it possible to convert FLV to MP4?
Yes - FLV converts to MP4.

You can do it right here with our free converter - no sign-up, and your file is deleted right after.

Upload your FLV above and download the MP4 - it is free and the file is deleted after converting. The main caveat is that very old FLVs using VP6 or Sorenson video must be re-encoded, causing a minor quality change.

Also to MP4: AVCHD · USM · MXF

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Tested on macOS, Windows & Linux
Last verified Sep 2026

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Why convert FLV to MP4?

FLV was built for Adobe Flash, which reached end-of-life in 2020 and is now blocked in every browser and unsupported on modern phones and TVs. Converting to .MP4 is the only reliable way to make these files playable again without installing legacy software. Most FLV files from 2008 onward already carry H.264 video inside, so the conversion is just a container swap.

How to convert FLV to MP4

Command line - FFmpeg CLI

Run ffmpeg -i input.flv -c copy output.mp4 to remux without re-encoding; if the FLV uses an older codec, use ffmpeg -i input.flv -c:v libx264 -c:a aac output.mp4 instead.

VLC media player FREE

Go to Media > Convert/Save, add the .flv file, choose a Video H.264 MP4 profile, and click Start.

HandBrake OPEN-SOURCE

Drag the .flv onto HandBrake, select an MP4 preset, and click Start Encode.

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About these formats

.FLV Flash Video

An FLV (Flash Video) file is a video made for Adobe Flash Player, the format YouTube and most streaming sites used through the 2000s. Flash is dead since December 2020, but VLC media player…

Open .FLV details →
.MP4 MPEG-4 Part 14 Video File

An MP4 file is a video container (MPEG-4 Part 14, standardized 2003) that holds video, audio, subtitles, and chapters in one file. It plays on every phone, computer, browser, and smart TV…

Open .MP4 details →

Quality & what to watch

  • If the FLV contains H.264 video and AAC audio, remuxing with -c copy produces zero quality loss - the streams are copied as-is into the new container.
  • Older FLVs using VP6 (vp6f) or Sorenson H.263 (flv1) must be re-encoded to H.264, which is slightly lossy and takes longer than a remux.
  • Embedded Flash cue points and onMetaData script tags inside FLV have no MP4 equivalent and are dropped, but normal video playback is unaffected.

Frequently asked questions

Can I convert FLV to MP4 without losing quality?
Yes, if the FLV uses H.264 + AAC - FFmpeg with -c copy remuxes it losslessly in seconds. Quality loss only occurs when re-encoding older codecs like VP6.
Why won't my FLV play on my phone or TV?
FLV was designed for Adobe Flash, which has been end-of-life since 2020 and is blocked in all modern browsers and devices. Converting to MP4 fixes playback everywhere.
How do I check which codec my FLV uses?
Run ffmpeg -i yourfile.flv without an output file and read the video stream line - h264 means a lossless remux works; vp6f or flv1 means re-encoding is needed.
How long does conversion take?
A remux with -c copy finishes in seconds regardless of file size. Re-encoding to H.264 typically completes in under the video's runtime on a modern machine.