FLV to MP4 — No Upload, No Watermark

Why convert FLV to MP4?

Flash died in 2020 and took FLV playback with it. Any Flash Video you still have — old course recordings, downloaded lectures, archived streams — needs converting simply to remain watchable at all.

FLV was the format behind a decade of web video until Flash was retired in 2020. Any FLV you still hold is effectively unplayable without conversion.

When FLV → MP4 is the right move

Recovering archived web video recorded during the Flash era.
Making old e-learning or webinar recordings playable again.
Migrating a legacy video library to a supported format.

Quality, size and what changes

FLV usually contains H.264 video already, so the conversion is often close to a rewrap with quality preserved. Very old Sorenson or VP6 material is re-encoded, which takes longer but is the only way to make it play.

What you gain with MP4: Plays everywhere, streams well and is hardware-accelerated on virtually all devices.

How it works

Drop your FLV file above and Morphio decodes it locally, then re-encodes it as MP4 using WebAssembly + the browser's native codecs. Nothing is ever uploaded — your files stay on your device. Batch as many files as your machine can handle. See exactly how in-browser conversion works.

FLV to MP4 — frequently asked questions

How do I convert FLV to MP4 without uploading the file?

Open the FLV to MP4 page, drop your video on the drop zone and press convert. Morphio runs an FFmpeg build compiled to WebAssembly that runs inside the page, so the FLV data never leaves your device and no server ever receives a copy.

Does converting FLV to MP4 lose quality?

Audio and video tracks are re-encoded together, so the result stays in sync and plays on standard players. Converting FLV to MP4 only rewrites the container and encoding you asked for — the source file on your disk is never modified.

Is the FLV to MP4 converter free, and how big can the file be?

Yes. The free plan covers 10 conversions a day with files up to 200 MB and adds no watermark or sign-up. Morphio Pro ($5/month, or $29 once for lifetime access) removes the daily cap and raises the per-file limit to 5 GB.

Can anything still play FLV?

Only specialist players like VLC. No browser has supported Flash Video since 2020.

Will the video look better as MP4?

It will look the same — the gain is that it plays on modern devices without extra software.

FLV to MP4 Converter

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