🎬 FLV to MP4
Convert FLV to MP4 — Free & Private
Transform legacy Flash FLV video files to modern MP4. Flash is no longer supported — convert your FLV archive to MP4 to preserve and share your videos.
✓ Free forever✓ No upload✓ No signup✓ Instant
Ready to convert your FLV to MP4?
100% in your browser · FFmpeg-powered · Instant download
How to Convert FLV to MP4
1
Open the Converter
Click "Convert Now" — opens on the Video tab with FLV → MP4 pre-selected.
2
Upload Your FLV
Drag & drop your video file or click Browse. Up to 500 MB supported.
3
Convert Instantly
FFmpeg runs entirely in your browser — no server upload needed.
4
Download MP4
Your converted file downloads automatically, ready to use.
Why Convert FLV to MP4?
- 🎬 Flash is dead — FLV files need to be converted to MP4 to play on modern devices
- 💾 Preserve your archive — convert old FLV recordings before they become unplayable
- 📦 Batch support — convert multiple files at once with Batch Convert mode
- 🔐 100% private — files stay on your device, never uploaded to any server
- 🆓 Free forever — no watermarks, no limits, no credit card
- ⚡ Instant — FFmpeg WebAssembly runs directly in your browser
Features
100% Private
Files never leave your browser. Zero server uploads.
FFmpeg-Powered
Industry-standard FFmpeg runs as WebAssembly in your browser.
Free
No account, no fee, no watermarks. Ever.
Batch Convert
Convert multiple FLV files to MP4 in one go.
High Quality
Output quality matches the original source video.
Mobile-Friendly
Works on any device — phone, tablet, desktop.
Frequently Asked Questions
Yes, completely free with no limits or watermarks. Convertlo runs entirely in your browser.
No. All conversion happens locally in your browser using FFmpeg compiled to WebAssembly. Your files never leave your device.
Yes. The conversion preserves video quality at a high bitrate setting. Output quality depends on the original file quality.
Flash is dead — FLV files need to be converted to MP4 to play on modern devices
Yes — enable Batch Convert mode to process multiple FLV files at once, each producing its own MP4 output.