File Viewer
MP4
100% Private
Works in any browser
What is a .mp4 file?
MP4 is the most widely used video format. It is supported natively by all modern browsers.
How to open a .mp4 file online
1
Go to JustOpenFile.com
2
Drag and drop your .mp4 file onto the page
3
Or click "Open File" and select your file
4
The file opens instantly in your browser — nothing is uploaded
100% Private
Your .mp4 file is processed entirely in your browser. It is never uploaded to any server.
FAQ
Is it free to open .mp4 files online? ▼
Yes, completely free. No account required.
Does my .mp4 file get uploaded? ▼
No. The file is opened locally in your browser using JavaScript.
What browsers are supported? ▼
All modern browsers: Chrome, Firefox, Safari, Edge.