Upload or paste PGN and get Stockfish analysis, accuracy, blunder detection, and a clean move-by-move review without signup.
PGN Analysis Online with Stockfish
Run free PGN analysis online with Stockfish — paste a single game or a multi-game PGN export and get move-by-move accuracy, blunder detection, and evaluation swings in one pass.
What PGN Analysis Should Do
PGN is the standard format for chess games. It carries the moves and often the full game metadata, so it is the cleanest way to import your own games, tournament files, or study material.
A useful PGN analyzer does more than just display moves. It should run engine analysis, show evaluation swings, classify mistakes, and let you compare games across the same workflow.
How to Analyze a PGN File
- Paste or upload PGN — Use the PGN tab on the homepage and import a single game or a multi-game PGN export.
- Run Stockfish analysis — The engine analyzes the moves on our servers, so your browser does not have to do the heavy work.
- Review the game — Inspect accuracy, blunders, move classifications, the evaluation graph, and opening detection.
What You Get
- Multi-game PGN support — Import large PGN exports and analyze more than one game in the same workflow.
- Stockfish server-side analysis — No browser slowdown and no waiting for a local engine to spin up.
- Accuracy and move labels — See how clean the game was and where the biggest mistakes happened.
- Opening detection — Map the game to the opening database and spot recurring repertoire issues.
Why Use PGN Instead of Manual Replay
PGN keeps the original game intact. That means less copy-paste friction and fewer mistakes when you want to analyze games from Chess.com, Lichess, tournaments, or desktop chess software.
It is also the best format for batch analysis. If you want to compare multiple games, track recurring mistakes, or keep your review flow consistent, PGN is the right input.
Related Analysis Tools
- Chess Accuracy Calculator — Compare your PGN game accuracy against realistic rating ranges.
- FEN Analyzer — Jump straight to a critical position when one moment matters more than the whole game.
- Free Chess Analysis — See how chess.rodeo compares against Chess.com and Lichess.