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Welcome to doccano

Text Annotation for Humans

doccano is an open source text annotation tool built for human beings. It provides annotation features for text classification, sequence labeling and sequence to sequence. So, you can create labeled data for sentiment analysis, named entity recognition, text summarization and so on. Just create project, upload your data and start annotating. You can build a dataset in hours.


You can enjoy this annotation demo.

Named entity recognition

First demo is one of the sequence labeling tasks, named-entity recognition. You just select text spans and annotate them. Since doccano supports shortcut keys, you can quickly annotate text spans.

Named Entity Recognition

Text Classification

Second demo is one of the text classification tasks, topic classification. Since there may be more than one category, you can annotate multi-labels.

Text Classification

Machine translation

Final demo is one of the sequence to sequence tasks, machine translation. Since there may be more than one responses in sequence to sequence tasks, you can create multiple responses.

Machine Translation

Quick Deployment


Doccano can be deployed to Heroku by clicking on the button below:


Of course, you can deploy doccano by using heroku-cli.

heroku create
heroku stack:set container
git push heroku master


Doccano can be deployed to AWS (Cloudformation) by clicking on the button below:

AWS CloudFormation Launch Stack SVG Button

Notice: (1) EC2 KeyPair cannot be created automatically, so make sure you have an existing EC2 KeyPair in one region. Or create one yourself. (2) If you want to access doccano via HTTPS in AWS, here is an instruction.