View NII volumes
without uploading them.
Three planes, window and header. Nothing is sent to a server.Research MRI volumes in three planes, with the window and the header fields — your browser reads the file, nothing is sent to a server.
PDF · Word · PowerPoint · Excel · CSV · JSON · Markdown · images · DICOM · NIfTI — all 19 formats
How it works
- Choose a NIfTI fileDrop a .nii or .nii.gz file on the page or pick it with the button.
- It opens in your browserOnly the header and the first volume are read, on your device — even a multi-gigabyte series opens quickly.
- Slice and inspectSwitch between axial, coronal and sagittal planes, scroll through slices, set the window, zoom and read the header.
19 formats
Everything you can open
Each format has its own viewer. Where we show less than the original program, we say so.
Documents
4 formatsPresentations
4 formatsSpreadsheets & data
3 formatsMedical scans
2 formatsImages
1 formatGuides
Short answers to common file questions
Questions
Is my scan uploaded anywhere?
No. Your browser opens the file directly on your device. The site only loads its own scripts, styles and fonts; the contents, name and bytes of your file are never sent to a server.
Which NIfTI files open?
NIfTI-1 and NIfTI-2, compressed (.nii.gz) or not, with integer or floating-point voxels. The orientation comes from the file, so planes are shown as in radiology: the patient’s right on the left of the screen. Complex and RGB volumes are not shown: the viewer names the data type.
What about 4D files (fMRI, DWI)?
The first volume is shown. The viewer shows how many volumes the file has.
Can I use it for a diagnosis?
No. OsonKit is not a medical device: it is for looking at images, for example from a study or a research project.
How large can the file be?
The file itself up to 16 GB; its first volume, unpacked, up to 400 MB.