Question 1

What is a FEN string?

Accepted Answer

FEN (Forsyth-Edwards Notation) is a standard notation for describing a particular board position of a chess game. It includes piece placement, active color, castling availability, en passant target, halfmove clock, and fullmove number.

Question 2

How do I use the FEN Viewer?

Accepted Answer

Paste one or more FEN strings (one per line) into the text area and click Load. Use the navigation buttons or arrow keys to step through positions. Press F to flip the board perspective.

Question 3

Can I set up a custom position?

Accepted Answer

Yes. Click the Setup Board button to open the board editor. Select a piece from the palette and click any square to place it. Set turn, castling rights, and en passant, then click Use Position to generate the FEN.

Question 4

Can I play moves on the board?

Accepted Answer

Yes. Click the Play button in the navigation bar to enable play mode. Click a piece to see legal moves highlighted, then click a target square to make the move. All standard chess rules are enforced including castling, en passant, and promotion.

Question 5

Is this FEN Viewer free?

Accepted Answer

Yes, this FEN Viewer is completely free to use with no sign-up required. It runs entirely in your browser.

♟ FEN Viewer

Positions

⚙ Setup Board

♟ FEN Viewer

Positions

⚙ Setup Board ×

⚙ Setup Board