Calfa Vision
a web-based annotation tool for documents and images

Collaborative and free


Create your instance

Calfa Vision is designed and organized as a project workspace. Statistics displayed on a dashboard are helping you to manage your project and achieve your tasks, and to stay tuned with the activity of your contributors and your objectives.

Invite your collaborators

Multi-users enabled, you can easily add your co-workers to work online on the project as a team, whatever the device they use and whoever they are. Dedicated to online annotation, the interface is intuitive and easy to handle.

Simply Annotate

The tool includes online, free, time-saving features, such as auto-detection of lines on a page, and (beta) text pre-recognition. Either your text is typed or handwritten.

Export your data

Multiple data formats are available to import your data in the project, and export the result of your annotations, ensuring the compatibility with many other data systems. At the end of the project, you have the possibility to delete your data.

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Automated tasks and customized models

Calfa Vision integrates generic models to analyse the page layout and detect lines, available for free in your personal labelization interface. We offer in option for our partners customized models and text recognition.

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Data compatibility

Input Output
pageXML pageXML
Images Mask GT
IIIF Link Text
Mask GT Pair image line + text

By using Calfa Vision, the user confirms owning the rights to use the content uploaded on the plateform. Calfa can not be taken for responsible of the non-respect of the rights associated to the pictures by the user. In case of infringement, Calfa can terminate the user account without prior notice.