Free Chess Tools
No account, nothing uploaded, Stockfish runs in your browser.
Also: Best move finder, Move calculator, Chess solver, Online engine, Accuracy calculator, Rating calculator
Tools explained, plus the FAQ
Find a move in one position
- Next chess move calculator, set a position and get the move to play.
- Best chess move finder, the same search shown as three ranked candidates.
- Chess move calculator, evaluation first, for reading who stands better and by how much.
- Chess solver, the same search framed as a puzzle answer, including forced mates.
- Online chess engine, raw Stockfish 17 with nothing installed and nothing uploaded.
All five run one Stockfish search on the position you give them. They differ in how the answer is presented, so use whichever framing matches the question you are asking.
Review a whole game
- Free chess game review, paste a PGN and get accuracy, move classifications and the moves that cost the game.
- Chess accuracy calculator, the same review with the method behind the accuracy figure explained in full.
Both search every position in the game in sequence, so they take a few minutes for a long game. Nothing is uploaded and no account is required.
Work out a rating
- Chess Elo calculator, the rating change for one game, shown for a win, a draw and a loss at once.
- Chess rating calculator, a whole event, including the FIDE performance rating.
These two are arithmetic only. They load no engine and no board, so they open instantly even on a slow connection.
Why these are free
Every engine tool here runs Stockfish inside your browser rather than on a server. There is no per analysis cost to recover, so there is no reason for an account wall or a daily cap, and there is no version of these pages where you paste a game and then get asked to sign up before seeing the result.
What the tools cannot do is see across your games. That is what Chess DNA is for: it imports your games from Chess.com or Lichess, analyses them at depth 18, and sorts the errors into nine weakness themes so the repeated mistake becomes visible.
Frequently Asked Questions
Are these chess tools really free?
Yes. No account, no email, no daily limit and no payment. The engine runs in your browser, so there is no server bill behind them.
Do the tools work offline?
After the first use, largely yes. The engine is cached by your browser once downloaded, and the pages themselves are static. The first search on a device needs a connection to fetch roughly 7 MB of engine.
Is my game data uploaded anywhere?
No. The PGN or FEN you paste stays in the page. Analysis runs in a Web Worker on your own device.
Which engine do these tools use?
Stockfish 17.1, in its lite WebAssembly build. It is the same open source engine used by Lichess and by the Chess DNA app.
