Convert videos to any format
Drag & drop video file here
Supports MP4, MKV, AVI, MOV, WebM and more
Drag & drop your FLV video
Automatic conversion with optimal settings
Save your converted MKV file
Preserve FLV content in the flexible MKV container with better codec support and metadata capabilities.
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.
MKV is a flexible, open-standard container format that can hold an unlimited number of video, audio, subtitle, and metadata tracks. It's the preferred format for high-quality video archival and media collections.
FLV is limited and deprecated. MKV offers modern codec support and multi-track capabilities.
Common scenarios for this conversion
Convert FLV to MKV when your device or app doesn't support the original format.
Upload MKV instead of FLV for better support on YouTube, Instagram, and TikTok.
Convert to MKV for seamless import into professional editing software.
Play FLV files on any phone by converting to MKV.
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.