Video Converter
Convert video formats in your browser: MP4, WebM, AVI, MOV, MKV, GIF. Powered by FFmpeg.wasm, 100% local processing, no upload. Free online video converter.
Drop a video here or click to browse
Supports MP4, WebM, AVI, MOV, MKV, FLV, WMV, 3GP โฆrecommended under 200MB
Frequently Asked Questions
Are my videos uploaded to a server?
No. This tool uses FFmpeg.wasm technology โฆall video processing happens locally in your browser. Your files never leave your computer, ensuring 100% privacy.
What formats are supported?
Input supports MP4, WebM, AVI, MOV, MKV, FLV, WMV, 3GP and other mainstream formats. Output supports conversion to MP4 (H.264), WebM (VP8), AVI (MPEG4), MOV (H.264), MKV (H.264), and GIF animation.
Why is conversion slow?
Our engine automatically uses multi-threaded processing when your browser supports it, utilizing all available CPU cores for 2-4x faster conversion. Tips: 1) Close other CPU-intensive programs; 2) Convert smaller videos; 3) The first use downloads ~32MB of engine files which are cached afterward. Use Chrome or Edge for best multi-threaded performance.
What's the maximum file size?
We recommend videos under 200MB. Due to browser memory limitations, larger files may cause conversion failures. For large files, consider trimming the video first.
Will conversion reduce quality?
Format conversion involves re-encoding, which may cause minor quality changes. MP4, MOV, and MKV use H.264 encoding with high quality. GIF is an animated image format with noticeable quality loss and file size changes.