Convert FLV to MP4 — Free, No Upload
Runs entirely in your browser. Nothing is sent to any server.
Video
Audio
Why convert FLV to MP4?
FLV is a dead Flash-era format that browsers no longer support. If you have old Flash videos you want to preserve, converting them to MP4 is the best way to ensure they'll play for years to come.
What is FLV?
FLV (Flash Video) was the dominant streaming format before HTML5. Flash is now dead, so FLV files need conversion to play on modern devices.
What is MP4?
MP4 (MPEG-4) is the most widely supported video format in the world. It plays natively on every phone, TV, browser, and media player.
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Frequently asked questions
Is this FLV to MP4 converter really free?
Yes, completely free. No account, no credit card, no watermark, no file size limit imposed by a paywall. Convifi is free to use forever.
Is my file safe when I convert FLV to MP4?
Your file never leaves your device. All conversion happens locally in your browser using WebAssembly. There is no upload to any server — not even Convifi's.
Does this work on iPhone, Mac, and Windows?
Yes. Because it runs in the browser, it works on any device — iPhone, Android, Mac, Windows, or Linux — as long as you have a modern browser like Chrome, Safari, Firefox, or Edge.
How long does FLV to MP4 conversion take?
Conversion time depends on your file size and device. Most files convert in under 30 seconds. Longer videos or high-resolution images may take a minute or two. Nothing is being sent over the network, so your connection speed has no effect.