What is a .NII file?
NII is a NIfTI neuroimaging file, used in brain MRI research.
- Did you know
- NIfTI was created in the early 2000s to standardise brain-scan data for researchers.
- NIfTI was devised by a US National Institutes of Health working group as a cleaner successor to the older ANALYZE 7.5 format.
- Unlike ANALYZE, which split a scan across separate header and image files, a single .nii file holds both the header and the voxel data together.
- What Analyser reads
- Open scientific, medical and engineering files: DICOM scans, NIfTI brain volumes, Garmin FIT/TCX activities, FITS astronomy frames, FASTA/FASTQ sequences, chemistry structures (MOL/SDF/MOL2/CIF/XYZ), Gerber/Excellon PCB data, SPICE netlists, EDF/BDF biosignals, JCAMP-DX spectra, SPSS/Stata/SAS datasets and VTK/ParaView meshes - metadata extracted entirely in-browser.
- Depth of analysis
- .NII is an identification-grade format: Analyser recognises it from its bytes and decodes the header metadata it carries, rather than opening it in a full viewer. Formats that do get a full viewer are marked "Full" on the formats page.
- Open a .NII file
- Drag a .NII file onto the Analyser home page (or tap to pick one). It is identified entirely in your browser - nothing is uploaded, there is no account, and it works offline once installed.