🎬 WebM to MP4
Convert WebM to MP4 — Free & Private
Transform WebM videos to the universally compatible MP4 format, playable on every device and platform including iPhone, Android, and Smart TVs.
✓ Free forever✓ No upload✓ No signup✓ Instant
Ready to convert your WebM to MP4?
100% in your browser · FFmpeg-powered · Instant download
How to Convert WebM to MP4
1
Open the Converter
Click "Convert Now" — opens on the Video tab with WebM → MP4 pre-selected.
2
Upload Your WebM
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 WebM to MP4?
- 🎬 MP4 plays everywhere — iPhones, Android phones, Smart TVs, and all media players
- 💾 Universal compatibility — MP4 is the most widely supported video format in the world
- 📦 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 WebM 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.
MP4 plays everywhere — iPhones, Android phones, Smart TVs, and all media players
Yes — enable Batch Convert mode to process multiple WebM files at once, each producing its own MP4 output.