Tools
6 min read
February 5, 2026

Video Format Converter Guide: MP4 vs MOV vs AVI vs WebM

Uploading a video and getting 'unsupported format' is frustrating. Here's what each format is for and how to convert between them in seconds.

Why Video Format Matters

Different platforms, devices, and editors expect different containers and codecs. A video that plays perfectly on your phone might get rejected by a web upload form, or vice versa.

Format Comparison

FormatBest forNotes
MP4Universal — web, social, mobileMost widely supported, good compression
MOVApple/Final Cut editingLarger files, high quality, less universal
AVIOlder Windows softwareLarge files, dated but still used in some workflows
WebMWeb embedding, open-sourceSmaller files, excellent for web video

How to Convert Video Formats Online

  • Open the Video Format Converter
  • Upload your video file
  • Select your target format (MP4, MOV, AVI, or WebM)
  • Download the converted file — encoded with ffmpeg for reliable compatibility
  • Choosing the Right Output Format

  • Uploading to YouTube, Instagram, or a website? → MP4
  • Editing in Final Cut Pro or sending to a Mac user? → MOV
  • Embedding lightweight video on a webpage? → WebM
  • Working with legacy Windows software? → AVI
  • Frequently Asked Questions

    Will converting reduce my video quality?

    Our converter uses high-quality encoding settings to preserve visual fidelity. Some quality loss is inherent to any re-encode, but it's generally imperceptible.

    What's the maximum file size?

    Up to 300MB per video — enough for most clips, vlogs, and short films.

    Can I also extract just the audio?

    Yes — use the Video to Audio Converter to pull the soundtrack out as MP3, WAV, or other formats.

    Related Tools

    After converting, you might want to compress your video to reduce file size, or trim it to a shorter clip.

    Written by the GMC Tools team