A selection of websites on international treaties:
A. Travaux Préparatoires
À la Recherche des Travaux Préparatoires: An Approach to Researching the Drafting History of International Agreements
Guide on searching for travaux préparatoires. Published by Jonathan Pratter (Foreign and International Law Librarian, Tarlton Law Library)
Audiovisual Library of International Law: Historic Archives
Access to the procedural history and related documents (including travaux préparatoires), as well as the text and status of selected legal instruments.
Collected Travaux Préparatoires
The Lillian Goldman Law Library (Yale Law School) has collected Travaux Préparatoires for international treaties that are available online or listed in its library catalogue.
What are Travaux Préparatoires and How Can I Find Them?
This website lists sources one can use to locate travaux préparatoires for UN multilateral treaties. Published by the Dag Hammarskjöld Library.
B. Treaty Texts
Avalon Project: Documents in Law, History and Diplomacy
Digital library of documents dating as far back as 4000 BCE. Developed and maintained by the Lillian Goldman Law Library, Yale Law School.
CIL Document Database
Database administered by the Centre for International Law (National University of Singapore) containing over 1400 ASEAN and international law documents in areas relevant to CIL’s research.
Core International Human Rights Instruments
Texts, ratifications and reservations of the 9 core treaties. Published by the Office of the United Nations High Commissioner for Human Rights. See also: Human Rights Instruments
Council of Europe: Treaty Office
Full texts of all conventions and agreements in the European Treaty Series (ETS) and Council of Europe Treaty Series (CETS). Published by the Council of Europe.
Searchable database of multilateral environmental treaties and national legislation. Jointly operated by the FAO, IUCN and UNEP.
IHL Databases: Treaties, States Parties and Commentaries
Databases containing treaties relating to international humanitarian law. Managed by the International Committee of the Red Cross.
International Investment Agreements Navigator
Database managed by UNCTAD. Treaties divided into 2 sections: Bilateral Investment Treaties (BITs) and Treaties with Investment Provisions (TIPs).
Standards published by the International Labour Organization.
Language of Peace
Database "provides easy access to compare and collate language on key issues across 75,000+ provisions of around 1,000 peace agreements."
Maritime Space: Legislation and Treaties
Information on the deposits with the Secretary-General of the United Nations, pursuant to the United Nations Convention on the Law of the Sea, and the status of state practice. Maintained by the Division for Ocean Affairs and the Law of the Sea.
Space Law Treaties and Principles
UNOOSA publishes full texts of the space treaties and principles as well as selected travaux preparatoires.
UNCITRAL: Texts and Status
Full texts of all conventions and related texts administered by UNCITRAL.
Conventions drawn up by the International Institute for the Unification of Private Law (UNIDROIT) and adopted at diplomatic conferences convened by member States of UNIDROIT. Click on the relevant subject in the right panel for the list of instruments under that category.
United Nations Treaty Collection
Access to the United Nations Treaty Series, League of Nations Treaty Series and Multilateral Treaties Deposited with the Secretary-General. Also includes publications like the Treaty Handbook and Final Clauses of Multilateral Treaties Handbook.
Guide published by the Peace Palace Library.
UN International Law Documentation: Treaty Research
Research guide published by the Dag Hammarskjold Library.