Constitute: the World's Constitutions

Constitute: The World’s Constitutions to Read, Search and Compare is a website offering access to the world’s constitutions that users can systematically compare them across a broad set of topics — using a modern, clean interface. The website, built by the Comparative Constitutions Project, has tagged passages of each constitution with a topic — e.g., “right to privacy” or “duty to pay taxes” — so you can quickly find relevant excerpts on a particular subject, no matter how they are worded. You can browse the 300+ topics in the expandable list on the left of the page, or see suggested topics while typing in the search bar (which also lets you perform free-text queries). You can also limit your results by country or by date.
The Comparative Constitutions Project  is directed by Zachary Elkins (University of Texas, Department of Government), Tom Ginsburg (University of Chicago, Law School), and James Melton (University College London), in cooperation with the Cline Center for Democracy at the University of Illinois. The project is supported by the National Science Foundation