Free chess tools

• Chess.com game analyzer: Enter your Chess.com username and Stockfish checks your recent games right here in your browser.
• Lichess game analyzer: Type your Lichess username and we check your recent games with Stockfish, in your browser.
• Square control map: Play moves or paste any position, and the board shades every square each side attacks, darker where more pieces cover it.
• Chess opening finder: Paste a PGN from Lichess or Chess.com, or just type the first moves, and get the name of the opening and its ECO code.
• PGN to GIF: Paste the PGN of any game (from Lichess, Chess.com or your own notes) and get an animated GIF of it, move by move.
• Chess accuracy checker: Enter your Chess.com or Lichess username, or paste a game, and Stockfish checks every one of your moves in your browser.

The engine runs on your device. Your games and results stay in your browser unless you create a free account to sync them. Share links contain only the result, never your username.

Every tool ends with something to do next: puzzles made from your own mistakes, the lessons that train the skill, or a bot at your level.