Convert videos to any format
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Supports MP4, MKV, AVI, MOV, WebM and more
Drag & drop your MP4 video
Automatic conversion with optimal settings
Save your converted FLV file
FLV conversion is mainly needed for legacy Flash-based systems or older streaming platforms that still require Flash Video format.
MP4 is the most widely used video container format, supporting H.264, H.265/HEVC, and AV1 codecs. It offers excellent compatibility across all devices, browsers, and platforms while maintaining a good balance between file size and quality.
FLV was the dominant web video format during the Flash era. While Flash is now deprecated, FLV files still exist in many archives and legacy systems.
MP4 is the modern standard with broad support. FLV is a legacy format from the Flash era. Unless required by legacy systems, MP4 is the better choice.
Common scenarios for this conversion
Convert MP4 to FLV when your device or app doesn't support the original format.
Upload FLV instead of MP4 for better support on YouTube, Instagram, and TikTok.
Convert to FLV for seamless import into professional editing software.
Play MP4 files on any phone by converting to FLV.
Your files never leave your device. All conversion happens in your browser — no server uploads.
Hardware-accelerated conversion powered by WebCodecs and WebAssembly.
Convert between any video format combination.