Convert MP4 to FLV

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Converting MP4 to FLV is free: drop your MP4 above, hit convert, and download the FLV. Files delete themselves within an hour.

Most MP4 to FLV conversions are wrapper swaps: the pictures stay pictures, they just trade MP4's box for one built for nothing new: today it's mostly old downloads waiting to be rescued. If the codec inside your MP4 is one FLV accepts, Flippy keeps quality bit-for-bit identical; if not, it re-encodes once, carefully, at matching quality.

Why flip MP4 to FLV

MP4 is the world's default video: the file that plays before anyone has to think about it. It was born in 2001, the MPEG standards group, built on Apple's QuickTime design, and its real weak spot is very little day to day: as a container its quality depends on the codec inside.

FLV is a relic of the Flash era: the format YouTube grew up on, stranded when Flash died. The Flash Video container, typically holding old H.263, VP6 or early H.264 streams. That makes it the right destination when what you need is nothing new: today it's mostly old downloads waiting to be rescued.

How to convert MP4 to FLV

1
Drop your MP4 file into the flipper above, or click to browse for it.
2
Check the output format: FLV is already selected for you.
3
Hit Convert, give it a moment, then download your new FLV.

MP4 vs FLV, side by side

	MP4	FLV
Born	2001, the MPEG standards group, built on Apple's QuickTime design	2002, Macromedia (later Adobe), for Flash Player
Type	video · container	video · container
Best for	playing everywhere: browsers, phones, TVs, editors, slide decks	nothing new: today it's mostly old downloads waiting to be rescued
Weak spot	very little day to day: as a container its quality depends on the codec inside	playing anywhere at all since Flash was switched off in 2020
Typical size	roughly 50–100 MB per minute at 1080p, depending on bitrate	small files with dial-up-era expectations about quality
Plays on	Every browser, phone, TV and editing app worth mentioning.	Almost nothing modern; VLC and converters are its retirement home.

Questions people ask

Will converting MP4 to FLV lose quality?

Usually not: when the video codec is compatible, Flippy swaps the container without re-encoding, so quality is untouched. If a re-encode is needed, it happens once at matching quality.

Will the FLV file be bigger or smaller than my MP4?

Similar, unless a re-encode is involved: then it depends on the codec. FLV typically runs small files with dial-up-era expectations about quality.

Where will the FLV file play?

Almost nothing modern; VLC and converters are its retirement home. That's the usual reason people leave MP4 behind: FLV simply opens in more of the places that matter.

How long does MP4 to FLV conversion take?

When it's a pure container swap it's nearly instant, since nothing is re-encoded. Full re-encodes take roughly as long as the video plays, often less.

More ways to handle these formats

Convert MP4 Convert FLV Reduce FLV file size FLV Cutter Resize FLV FLV Rotator Rotate MP4