Which video format should I use — MP4, WebM, or MKV?

MP4 (H.264) is the most universally compatible format, supported by virtually all devices and platforms — use this for sharing and general use. WebM is optimized for web playback with excellent browser support. MKV is a flexible container supporting multiple audio and subtitle tracks, ideal for archiving.

Can I convert a video to GIF?

Yes. Select GIF as the output format to convert any video clip to an animated GIF. You can control the resolution and frame rate to balance quality and file size.

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🎬 Video Converter

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Drop video files here

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MP4 MKV MOV AVI WebM FLV 3GP WMV TS M4V

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Conversion Settings

Output Format

Quality

Resolution

Frame Rate (FPS)

Remove audio track (video only)

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Format Guide — Which to Choose?

MP4

Best overall compatibility. Works on all devices, browsers, and players. Recommended for sharing and web use.

MKV

Open format, supports multiple audio/subtitle tracks. Great for high-quality video storage and archiving.

MOV

Apple's format. Best for macOS, iOS, and Final Cut Pro workflows. High quality, larger file size.

WebM

Google's web format. Smallest file size for web embedding. Supported by Chrome, Firefox, and Edge.

GIF

Animated image format. No audio, limited colors, large file size. Best for short clips under 10 seconds.

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How It Works

This converter uses FFmpeg.wasm — a WebAssembly port of the industry-standard FFmpeg library compiled to run entirely in your browser. Your video files are never uploaded to any server. All processing happens locally on your device. The FFmpeg WASM binary (~30MB) is downloaded once from a CDN and cached by your browser.

🎬 FFmpeg.wasm

🔒 Files never leave device

⚡ WebAssembly powered

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Frequently Asked Questions

Are my video files uploaded to a server?

No. All conversion is done entirely in your browser using FFmpeg.wasm. Your files never leave your device and are never transmitted to any server.

Which format should I convert to?

MP4 with H.264 encoding offers the best compatibility across devices, browsers, and platforms. Use WebM for web-optimized video or MKV if you need a container that supports multiple audio/subtitle tracks.

Why does conversion take a long time?

Large files are processed entirely locally in your browser using WebAssembly. Conversion speed depends on your CPU and file size. There is no server to offload the work to, so processing time scales with file complexity.

What is the best video format for web?

MP4 with H.264 codec has the widest browser and device compatibility. WebM (VP9) offers smaller file sizes for web streaming. For modern web delivery, H.265/HEVC offers better compression than H.264 but has limited browser support.

Can I convert MOV to MP4 online without uploading?

Yes. This converter processes MOV, AVI, MKV, WebM, and other formats entirely in your browser using FFmpeg.wasm. No file upload is required — your video stays on your device throughout the conversion.

Is there a file size limit for video conversion?

There is no server-imposed size limit since conversion happens locally. The practical limit is your device's available RAM. Very large files (2 GB+) may be slow or cause browser memory issues on older devices.