🎬 Video Converter
Convert MP4 to FLV — Free & Private
Convert MP4 to FLV for use in legacy Flash-based players and older web video systems.
✓ Free forever✓ No upload✓ No signup✓ Instant
Ready to convert your MP4?
100% in your browser · Powered by FFmpeg.wasm · No account needed
How to Convert MP4 to FLV
1
Open the Converter
Click "Convert Now" to open with MP4 → FLV pre-selected.
2
Upload Your MP4
Drag & drop your MP4 file or click Browse to select it.
3
Convert Instantly
FFmpeg.wasm processes your video locally — nothing uploaded to any server.
4
Download FLV
Your converted FLV file downloads automatically when ready.
Why Convert MP4 to FLV?
- 🎬 From MP4 — convert the world's most universal video format to any target format
- 🌐 Legacy web video — FLV was the standard format for web video before HTML5
- 📦 Compact file size — FLV uses efficient compression for small file sizes
- 🔄 Flash player compatible — works with legacy Flash-based video players
- 🎬 Streaming-ready — FLV was optimised for progressive streaming delivery
- 🔒 100% private — files never leave your device
Features
100% Private
Files never leave your browser. Powered by FFmpeg.wasm.
Instant
In-browser processing — no server queue, no waiting.
Free
No account, no fee, no watermarks. Ever.
Quality Preserved
Converts at the highest quality settings by default.
Mobile-Friendly
Works on any device — phone, tablet, desktop.
No Install
Nothing to download. Works in any modern browser.
Frequently Asked Questions
Quality depends on the target format. For lossless remux to MKV, quality is identical. For FLV/WMV, some re-encoding occurs at high quality settings.
Conversion speed depends on file size and your device. FFmpeg.wasm processes video locally in your browser.
Yes — 100% free, no limits, no watermarks, no account needed. Convertlo runs entirely in your browser.
No. All conversion happens locally using FFmpeg.wasm. Your files never leave your device.
Yes — there is no strict file size limit, though very large files may take longer depending on your device's memory.