Free Chess Analyzer: Unlimited Game Analysis Online
Chess45 is a free chess analysis tool with no limits. Paste a game, let the engine look it over, and learn from every move. You can analyze as many games as you want, at any engine strength, without paying and without creating an account.
A Free Chess Analyzer With No Limits
Some chess analyzers cap how many games you can review each day, or lock their deepest analysis behind a subscription. Chess45 doesn't. Whether you want to review one game or fifty, the analysis is free every time.
- Free and unlimited: analyze as many games as you like, as often as you like.
- No sign-up: open the page, paste your PGN and press Analyze.
- Works with any PGN: analyze games from Chess.com, Lichess or any other site or app.
- Three engine strengths: Fast for a quick scan, Strong for the best balance, Deep for the most accurate review. All three are free.
- Full game review: a summary report and a move list that show how the game went and where it turned.
- Step through every position: move back and forward on the board, flip it, and switch the live engine on or off.
Why Analyzing Your Chess Games Is the Fastest Way to Improve
Playing more games helps, but reviewing them is where the real progress happens. A game you've analyzed teaches you something; a game you've only played is mostly forgotten by tomorrow.
Why Reviewing Your Games Matters
Every game you play is a free lesson in your own habits — how you handle the opening, where you get nervous, which positions you misjudge. Without a review, those lessons slip away and you repeat the same mistakes game after game. With one, you can see exactly what happened and why. Even a quick ten-minute review of your latest game will teach you more than playing another one right away.
Find the Turning Point
Most games are decided by a handful of moments — a blunder, a missed tactic, or a chance that never got taken. You don't need to study every move with the same intensity. Find the move where the evaluation swung and spend your time there. Ask what you were thinking, what you overlooked, and what the position was really asking for. One turning point studied well is worth more than a whole game skimmed.
Look for Patterns, Not Just Mistakes
A single blunder is an accident. The same kind of blunder three times is a habit. As you review more games, watch for what keeps coming back — pieces left undefended, an opponent's threat you didn't check for, attacks launched too early, or the same shaky opening line. Write the pattern down in a sentence. Once you can name a habit, you can start fixing it, and your next games will show it.
Use the Engine as a Tool, Not a Teacher
An engine can tell you which move is best, but it won't tell you why. Before you look at its suggestion, pause and decide what you would have played — then compare. When the engine disagrees, ask what your move missed. Remember that some engine lines are too precise for a human to find over the board; look for the underlying idea — the threat, the weakness, the better square — instead of trying to memorize the moves.
Analyze Your Wins Too
It's tempting to review only the games you lost, but wins hide mistakes as well. Sometimes your opponent simply missed your errors, or you won a position that was already winning much sooner. Reviewing a win also shows you what you did well, so you can repeat it on purpose. And reviewing while the game is still fresh lets you compare what you were thinking at the time with what the position really held — that gap is where the learning is.
Turn What You Find Into Training
Analysis is most powerful when it changes what you practice. If your review shows you keep missing forks, work on fork chess puzzles matched to your rating. If you keep losing endgames you should have drawn, study those endgames. The review tells you what to work on, the practice makes it stick, and the next game shows you whether it worked. That loop is the whole secret of steady improvement.
Chess Analyzer FAQ
Is Chess45's chess analyzer really free?
Yes. The analyzer is completely free and unlimited. There is no cap on how many games you can analyze, and the strongest Deep setting is free too.
Do I need an account to analyze my chess games?
No. Open the page, paste your PGN and press Analyze. You don't need to sign up or log in.
Can I analyze games from Chess.com and Lichess?
Yes. The analyzer reads standard PGN, so you can analyze games from Chess.com, Lichess or any other site or app that lets you copy or download a PGN.
How do I get the PGN of my game?
Open the finished game on the site where you played it and use its share, export or download option to copy the PGN. Then paste it into the Game PGN box above.
What is the difference between Fast, Strong and Deep?
Fast is a quick scan. Strong is the recommended balance of speed and accuracy. Deep is the slowest but most accurate, best for the games that matter most.
Is the chess analyzer good for beginners?
Yes. Beginners gain the most from reviewing games, because the analysis shows exactly which moves lost material or turned the game, so you can fix those habits early.
Every game you analyze is a small investment in a better chess brain. Stay consistent, study your mistakes, and trust the process. The rating takes care of itself.