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Convert Fly

Format Converter

Convert between MP4, WebM, MOV, and MKV without quality loss

Free Video Format Converter - MP4, WebM, MOV, MKV

Convert video formats online for free with Convert Fly. Easily convert between MP4, WebM, MOV, and MKV formats without quality loss. Fast, private, and no file size limits up to 2GB.

Supported Video Format Conversions

  • •MP4 Converter: Convert to MP4 from WebM, MOV, MKV, AVI, and FLV
  • •WebM Converter: Convert to WebM for web-optimized videos
  • •MOV Converter: Convert to MOV for Apple devices and Final Cut Pro
  • •MKV Converter: Convert to MKV for high-quality video storage

Why Use Convert Fly Video Converter?

  • ✓Fast Conversion: Quick transmuxing when possible for instant results
  • ✓Quality Preserved: No quality loss during format conversion
  • ✓Privacy First: Videos never leave your browser, 100% offline processing
  • ✓Large Files: Convert videos up to 2GB without restrictions
  • ✓Free Forever: No subscriptions, watermarks, or hidden costs

How to Convert Video Formats

  1. 1. Select Video: Choose your video file in any supported format
  2. 2. Pick Format: Select your target format (MP4, WebM, MOV, or MKV)
  3. 3. Convert: Click "Convert Video" to start the conversion
  4. 4. Download: Get your converted video instantly

Common Use Cases

MP4 to WebM: Convert for web optimization and smaller file sizes.

MOV to MP4: Convert iPhone/Mac videos for universal playback.

MKV to MP4: Convert for compatibility with most devices and players.

AVI to MP4: Modernize old video files for better compression and compatibility.

100% Browser-Based: Unlike other online converters that require uploading to cloud servers, Convert Fly converts videos entirely in your browser using WebAssembly technology. Your files remain private and secure on your device.