Free tool
FEN Viewer
A FEN string is a one-line snapshot of a chess position. Paste one in and see it on a full board instantly, with Stockfish evaluation and the engine’s preferred move drawn as an arrow. Share any position back out as a link. Everything runs locally in your browser.
What you get
- Stockfish engine evaluation, live as you step through moves
- Full game review: every move graded, accuracy per side, evaluation graph
- Opening detection against 3,700+ named lines
- Works offline once loaded — your games never leave your browser