NRRD.co.ukPublic test

A learning and exploration tool

Turn a 3D volume
into an STL.

Upload a scan volume, choose the range of values that makes up the object you want, preview it in slices and in 3D, then download a mesh you can view, edit or 3D print.

  1. UploadNRRD, NIfTI, DICOM, MetaImage, TIFF or image slices
  2. SelectPick a value range, crop, and keep the pieces you want
  3. ExportSmooth, simplify and download an STL

Upload a volume

Up to 1 GB. Choose a single file, several files, a whole folder (for DICOM series or image slices), or a .zip.

Drop files or a folder here or
No file to hand?

Limited to 1 upload per connection per day; failed conversions don’t count. Files are deleted automatically after 7 days.

What can I upload?

Supported volume formats

Everything is converted to a normalised NRRD on the server, keeping only the voxel values and their physical geometry.

NRRD.nrrd or .nhdr + data file

Used by 3D Slicer. Label maps are detected automatically.

NIfTI.nii .nii.gz

Common for MRI and research data.

DICOM seriesa folder, many files, or a .zip

The series with the most slices is used. Patient tags are discarded.

MetaImage.mha or .mhd + .raw

Used by ITK and many research tools.

Image stacksmulti-page .tif, or PNG/JPEG/TIFF/BMP slices

Slices are stacked in file-name order with 1 unit spacing.

OthersAnalyze .hdr + .img, VTK legacy .vtk

Upload paired files together.

Before uploading

Public-test conditions

Not a medical device

This is an experimental visualisation and file-conversion tool for learning and exploration. It is not a medical device or clinical service.

Anonymised files only

You must remove identifying information before upload. Facial anatomy and other voxel content may itself be identifying.

Best-effort metadata removal

Only voxel values and geometry are kept when files are converted. This is not guaranteed to remove every identifier and does not alter identifying voxel data.

Value ranges are not anatomy

Selecting a range of values does not identify an organ or tissue. Presets are rough starting points only.

No reliance

The service is provided as-is without warranties. To the extent permitted by law, the operator accepts no responsibility for decisions, losses or harm arising from reliance on an output.

Development review

The operator may inspect uploads and generated files to diagnose failures. A pseudonymous connection identifier is kept with each job. Jobs are deleted after 7 days.