Visualize, share and annotate your large 3D images online 

Upload your data and share links with colleagues. Collaboratively create skeleton and volume annotations, all from your browser. Optimized for multi-terabyte datasets.

webKnossos is open source and has been published in Nature Methods.

New: 10GB of storage for free accounts

Highlights

webKnossos makes working with large datasets easier and enables global collaboration.

Scalable from giga- to petavoxel datasets

webKnossos scales seamlessly from smaller to the largest image datasets available. Support for 2D and 3D datasets with multiple channels.

Unique annotation modes for faster results

The unique “flight mode” enables very fast skeleton annotation of neurites. Efficient volume annotation tools accelerate training data generation and proof-reading.

Fast browsing no matter where you are

webKnossos storage and streaming technology provides fast browsing speeds to your work computer, home-office laptop and tablet on-the-go. 

Collaborate, securely

Your datasets are only accessible by you and your chosen collaborators. Once you are ready, publish them with a click of a button.

webKnossos in action

Explore remarkable datasets from the scientific community in webKnossos.Sign up to build upon the data and create your own annotations.

Your dataset is not in the list?We are happy to host selected public datasets on webknossos.org for free.Please contact us to get the dataset uploaded. 

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Visualize large EM datasets with segmentations. Automatically generate meshes. Tweak the histogram and other settings to improve the view.

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Skeleton annotations for measuring neurons, quantifying objects and marking interesting locations in the dataset.

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Volume annotation features for creating segmentations and training data.

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The unique flight mode enables fast and precise annotations of neurons.

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Support for many image modalities, including fluorescence microscopy, electron microscopy, Micro-CT (µCT) and MRI.

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Securely share data with collaborators, reviewers and the scientific community.

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Task management features for managing annotation projects with dozens or hundreds of annotators.

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