GIFTI File — Open & Convert .gii Online
What Is a .gii File?
GIFTI (.gii) is a medical file format. GIFTI Surface Data Created by NIfTI, this format is essential for radiologists and clinicians.
How to Open .gii Files
Upload your .gii file to OpenAnyFile and instantly view and reconstruct it in your browser. No software installation required. Works on Windows, macOS, Linux, iPhone, and Android.
Everything About GIFTI Files
Popular GIFTI Conversions
Frequently Asked Questions
What is a .gii file?
A .gii file is a medical format called GIFTI. GIFTI Surface Data
How do I open a .gii file without installing software?
Upload your .gii file to OpenAnyFile. Our browser-based tool instantly detects and displays it — no downloads needed.
What program creates .gii files?
.gii files are typically created by NIfTI.
Can I convert .gii to another format?
Yes. OpenAnyFile converts .gii to VTK, STL.
Is it safe to open .gii files online?
Yes. OpenAnyFile processes files in a secure, isolated environment. Files are automatically deleted and all transfers use HTTPS.
Can I open .gii on my phone?
Yes. OpenAnyFile works on all mobile browsers including iPhone and Android.