How to Convert WebM to MP4 (Universal Video Compatibility)

WebM is Google's web video format. It works in browsers but not on iPhones, most Smart TVs, or social media platforms. Upload to MegaConvert.io and select MP4 — done in seconds, free.

The Problem

You downloaded a video from a website and it's in .webm format. It plays in Chrome but your iPhone won't open it, your TV shows an error, and Instagram rejects the upload.

Why Convert?

• iPhone/iPad — Apple devices don't play WebM natively.
• Smart TVs — most don't support WebM.
• Social media — Instagram, TikTok, Twitter need MP4.
• Video editing — most editors handle MP4 better than WebM.

How to Convert Online

1. Go to megaconvert.io/webm-to-mp4.
2. Drag and drop your .webm file.
3. Download your .mp4.

No account. No watermarks. Files auto-delete after 1 hour.

Related Conversions

• MP4 to WebM — reverse for web.
• FLV to MP4 — old Flash format.
• MKV to MP4 — another common one.
• AVI to MP4 — legacy format.

For Developers: API

curl -X POST https://megaconvert.io/api/v1/convert/sync \
  -H "X-API-Key: YOUR_API_KEY" \
  -F "file=@input.webm" \
  -F "output_format=mp4" \
  -o output.mp4

API docs → | SDKs →