Tools
Tools

Free chess tools, no signup

An analysis board, a best move finder, a position editor and an Elo calculator. All free, nothing to install, and the three board tools run Stockfish 18 in your browser.

Analysis Board

Stockfish reading over your shoulder as you push the pieces. Live eval, the best three lines, and a move list that follows you.

Live enginePaste FEN or PGNTop 3 lines Open the board

Best Move Finder

One question, one answer. Paste a position and get the move to play, the line behind it, and the near-misses.

Instant answerRunner-up movesStockfish 18 Find the move

Position Editor

Build any position by tapping a piece then a square. Set the turn and castling, and send it to the board or the engine.

Tap to placeTells you what is illegalExports FEN Start building

Elo Calculator

What a win, draw or loss does to your rating against any opponent, and how many games a target rating takes.

Any K-factorWin, draw, lossTarget planner Work it out

Free chess tools that run in your browser

Four tools for the moments between games: an analysis board, a best move finder, a position editor and an Elo calculator. All four are free and need no account. The three board tools run Stockfish 18 in your browser, so nothing is installed and a position is answered on your own device.

Which tool to open

Analysis Board is for exploring. Move a piece and the engine reads the new position straight away: an evaluation, a verdict in plain words, and its three best lines in normal chess notation. Paste a FEN or a PGN to start from a position or a whole game.

Best Move Finder is for one question. Paste a position, or a whole game and it answers for the last position, and it tells you the move Stockfish 18 would play, the line it expects to follow and the other moves it considered playable.

Position Editor is for building a position by hand. Pick a piece, tap a square to place it, set the side to move, castling and en passant, and copy the FEN or send the position to the board or the finder.

Elo Calculator is for ratings. Enter your rating and your opponent's to see what a win, a draw or a loss does to yours with any K-factor, then set a target rating and see how many games the climb takes.

When you want a whole game graded

The tools answer one position at a time. To have every move of a finished game graded, from Brilliancy down to Blunder, with accuracy for both players and a written summary, use the free chess game review. To look up an official rating, use the FIDE rating search, and for the words engines and reviews use, the chess terms glossary.

Frequently asked questions

Are these chess tools free?

Yes. All four are free and none of them needs an account.

Which engine do the board tools use?

Stockfish 18, running in your browser.

Can I analyse a whole game?

Paste a PGN into the Analysis Board to step through it with the engine, or run a free game review to have every move graded.