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Convert videos between formats instantly in your browser. Supports MP4, MKV, WebM, AVI, and MOV with no file size limits or watermarks.
Uses FFmpeg WebAssembly for professional-quality video conversion right in your browser.
Videos never leave your device. All processing happens locally for complete privacy.
Convert between MP4, MKV, WebM, AVI, and MOV with modern codec support.
Drag and drop a video here, or click to select
Supports MP4, MKV, AVI, MOV, WebM • 100% client-side processing
Convert videos for different platforms and devices. MP4 for universal playback, WebM for web optimization, MKV for archiving with multiple audio tracks.
Reduce file sizes with quality presets. Convert to WebM with VP9 codec for superior compression or use H.264 for wide compatibility.
All conversion happens in your browser using FFmpeg WebAssembly. Faster processing with no upload wait times and complete privacy.
Powered by FFmpeg, the industry-standard media processing tool used by professionals worldwide. Get reliable, high-quality conversions.
Your videos never leave your device. All processing happens locally in your browser, ensuring complete privacy and security for sensitive content.
Convert unlimited videos with no file size restrictions, watermarks, or usage limits. Completely free forever for personal and commercial use.
Drag & drop or select your video file
Select output format and quality preset
Click convert and preview the result
Download your converted video
Upload your MP4 file, select MKV (or any other format) from the output format dropdown, choose a quality preset (Medium recommended), and click 'Convert Video'. The conversion happens entirely in your browser using FFmpeg WebAssembly, so your video never leaves your device.
You can convert between MP4 (H.264), MKV (Matroska), WebM (VP9), AVI, and MOV (QuickTime) formats. The tool supports modern codecs including H.264 for wide compatibility and VP9 for superior compression.
No file size limits. Since all conversion happens in your browser using FFmpeg WebAssembly, there are no upload restrictions. Processing speed depends on your device's performance and the video size.
No. All video conversion happens locally in your browser using FFmpeg WebAssembly. Your videos never leave your device, ensuring complete privacy and security. This also means instant processing with no upload wait times.
Medium quality is recommended for most uses - it provides excellent quality while keeping file sizes reasonable. Choose High for maximum quality (results in larger files) or Low for the smallest possible file sizes. Note that quality presets affect compression, not the video resolution.
MP4 offers universal compatibility across all devices and platforms. MKV is ideal for archiving and supports multiple audio/subtitle tracks. WebM provides superior compression for web use and is optimized for streaming. AVI and MOV are legacy formats with wide software support.
Install this tool as a standalone app for faster access and offline use