NII File Viewer Online
Open and preview .nii files (NIfTI Brain Scan) directly in your browser — no downloads, no installs, no account required.
Open NII File Now →About NII Files
| Extension | .nii |
| Full Name | NIfTI Brain Scan |
| MIME Type | application/octet-stream |
| Category | 🔬 Scientific |
| Processing | 🔒 In-browser (private) |
How to Open NII Files Online
- Visit ViewAnyFile.app
Go to ViewAnyFile.app in any web browser.
- Upload your NII file
Drag and drop your
.niifile, or click to browse. - View instantly
Your file renders immediately. It stays in your browser — nothing is uploaded.
Frequently Asked Questions
How do I open a NII file online?
Visit ViewAnyFile.app and drag your .nii file into the upload area. It renders instantly — no download or account needed.
Is it safe to open NII files on ViewAnyFile.app?
Yes. All processing for NII files happens entirely inside your browser. Your files never leave your device and are never uploaded to any server.
Can I open NII files on Mac and mobile?
Yes. ViewAnyFile.app works in any modern browser on Windows, macOS, Linux, iPhone (Safari), and Android (Chrome). No operating system restrictions.
Do I need to create an account?
No. ViewAnyFile.app is 100% free with no signup required. Just drag, drop, and view.