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Chess FEN Parser

Parse and visualize Chess FEN (Forsyth-Edwards Notation) strings. See the board position with Unicode pieces, extract metadata like turn, castling rights, en passant, and move clocks. Runs entirely in your browser — your data never leaves your machine.

chess fen parser game notation

Published May 31, 2026

All interactive tools run entirely in your browser. Your data never leaves your device.

How It Works

Enter a FEN string to see the chess position rendered as a visual board with Unicode pieces. The tool validates the FEN, extracts all metadata fields, and displays piece counts with a breakdown by type.

Features

  • Visual board: renders 8x8 grid with Unicode chess pieces on alternating light/dark squares
  • Full validation: checks rank count, piece characters, king presence, and field formats
  • Metadata extraction: active color, castling rights, en passant square, halfmove clock, fullmove number
  • Piece count: total pieces with white/black breakdown and per-piece-type counts
  • 5 examples: starting position, Sicilian Defense, Scholar’s Mate, endgame, Kasparov vs Deep Blue
  • Private: runs entirely in the browser — your data never leaves your machine

Use Cases

  • Visualizing FEN positions from chess databases or engines
  • Debugging chess programming projects (move generators, evaluation functions)
  • Validating FEN strings before use in applications
  • Quick board visualization without a full chess GUI