Convert FLV to MP4 — no upload, no Flash required

Flash has been gone since 2021, and it took FLV playback down with it. OpenConvertVideo converts your old .flv files to MP4 right in your browser, so those web downloads and screen recordings play again.

Convert FLV to MP4 →
  • No upload wait
  • Nothing leaves your device
  • Free, no account
  • No artificial size limits

Why you probably still have FLV files

FLV — Flash Video — was the default format for web video from roughly 2005 to 2015. If you ever saved a clip off the web with a browser extension, downloaded a video before YouTube switched to MP4, or recorded your screen with an early version of Camtasia or Wink, you likely ended up with .flv files. The video inside is usually Sorenson Spark, VP6, or H.264, wrapped in Adobe's own container.

These files often sat untouched in a folder for a decade, because there was never an urgent reason to deal with them — until now.

Flash is dead, and it's staying dead

Adobe stopped supporting Flash Player at the end of 2020 and blocked it from running at all starting in January 2021. Chrome, Firefox, Safari, and Edge all removed Flash support entirely. That's the specific reason your FLV files stopped opening — it isn't your computer, your player, or a missing codec you can just install. The software this format depended on doesn't exist anymore.

FLV files aren't corrupted. The video data inside is intact; it's the ecosystem around it that's gone.

About that old download

If your FLV files are your own recordings — a screen capture, a home video, something a friend sent you — converting and keeping them is entirely your business. If some were downloaded from a site you didn't own or have permission to save from, that's worth a moment's thought before you re-share the result. Changing the file format doesn't change who owns what's inside it.

What you end up with

  • H.264 video in an MP4 container, with AAC audio.
  • Plays on iPhone, Android, Windows, Mac, and smart TVs.
  • Imports into Premiere, Final Cut, DaVinci Resolve, and CapCut.
  • Converted on your own device — we just supply the code — so an old private recording stays 100% private and never has to leave it.

Frequently asked questions

What is an FLV file?
FLV (Flash Video) was the standard video format for the web during the Adobe Flash era, roughly 2005 to 2015. It typically holds Sorenson Spark, VP6, or H.264 video inside Adobe's own container, and it shows up in old web downloads, archived clips, and recordings from early screen-capture tools like Camtasia.
Why did my FLV files suddenly stop playing?
They didn't change — the software around them disappeared. Adobe ended Flash Player support in December 2020 and blocked it from running in January 2021, and every major browser removed Flash entirely. FLV relied on that ecosystem, so once it was gone, nothing on a modern computer could open the files.
How do I convert FLV to MP4?
Pick your .flv file in the converter, set the output to MP4 (H.264), and convert. It happens entirely in your browser, with no upload and no waiting in a queue, and you get a standard MP4 that any current device or player can open.
Is it legal to convert my old FLV files?
Converting your own recordings, or files someone shared with you directly, is no different from converting any other video you own. The format change doesn't affect copyright either way — if a file was originally downloaded from somewhere without permission, that's the same consideration it always was.
Is the conversion private?
Yes. Your .flv file is decoded and re-encoded on your own device with a WebAssembly build of ffmpeg. Nothing is uploaded, stored, or seen by anyone — you can check your browser's Network tab during conversion to confirm nothing leaves your machine.

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