There are several major repositories where you can download large collections of chess games in PGN format:
If you are looking to download your own personal match history for analysis: How do I get a PGN of my game? | Chess.com Help Center Download angpg pgn
: A comprehensive historical database where users can download individual PGNs or collections, often including expert commentary. There are several major repositories where you can
: Useful for exporting all games from a specific Lichess or Chess.com username for personalized opening analysis. How to Download Your Own Games or specific tournament event.
: Provides massive bulk downloads of all games played on the platform, as well as specific tournament exports.
: Offers a massive, free library of PGN files organized by player, opening, or specific tournament event.