🎬 Video Converter
Convert FLV to MKV — Free & Private
Convert FLV to MKV to preserve legacy Flash video in a modern, flexible container.
✓ Free forever✓ No upload✓ No signup✓ Instant
Ready to convert your FLV?
100% in your browser · Powered by FFmpeg.wasm · No account needed
How to Convert FLV to MKV
1
Open the Converter
Click "Convert Now" to open with FLV → MKV pre-selected.
2
Upload Your FLV
Drag & drop your FLV file or click Browse.
3
Convert Instantly
FFmpeg.wasm processes your video locally — nothing uploaded.
4
Download MKV
Your converted MKV file downloads automatically.
Why Convert FLV to MKV?
- 📼 From FLV — modernise legacy Flash video files to formats supported on all current devices
- 📦 Flexible container — supports multiple audio tracks, subtitles, and chapters
- ✨ Quality preserved — video copied without re-encoding where possible
- 🌍 Open standard — supported by VLC, Plex, Kodi, and most players
- 🔊 Multi-track audio — store multiple language tracks in one file
- 🔒 100% private — files never leave your device
Features
100% Private
Files never leave your browser.
Instant
In-browser processing, no waiting.
Free
No account, no fee, no watermarks.
Quality Preserved
High-quality settings by default.
Mobile-Friendly
Works on any device.
No Install
Works in any modern browser.
Frequently Asked Questions
Yes — 100% free, no limits, no watermarks, no account needed.
No. All conversion happens locally using FFmpeg.wasm. Your files never leave your device.
Quality depends on the target format. Conversions use high-quality settings by default.
Yes — no strict size limit, though very large files may take longer on slower devices.
Speed depends on file size and your device. Everything processes locally in your browser.