About Video Converter
This free online video converter uses FFmpeg.wasm to convert between all major video formats directly in your browser. No files are ever uploaded to a server — everything runs locally on your device.
Format guide: MP4 (H.264) — universal compatibility, works on all devices and platforms. WebM (VP8/VP9) — best for web use, open format. AVI — older Windows format, large files. MOV — Apple QuickTime format. MKV — flexible container, supports multiple audio/subtitle tracks.
Updated: May 2025 · Works on Chrome, Firefox, Edge · Mobile friendly
Frequently Asked Questions
Which format should I convert to?+
MP4 (H.264) is the safest choice — it plays on every device, browser, TV, phone and social media platform. Use WebM for web embedding, MOV for Apple/Final Cut, MKV for media players.
How long does video conversion take?+
Browser-based conversion is slower than native apps. A 100MB video typically takes 3-8 minutes. Higher quality or higher resolution settings take longer.
Will conversion reduce video quality?+
At Standard or High quality settings, the difference is barely perceptible. Every conversion involves re-encoding which has some minimal quality impact — keep the original file if you need to re-convert later.
What is the maximum file size?+
Up to 500MB. The file is loaded into browser memory — devices with less than 4GB RAM may struggle with very large video files.