CodeUtility
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Explain and fix code

AI Code Checker

Paste your code and choose what you need. Explain tells you what the code does in plain language. Check and fix finds bugs and syntax errors and gives you a corrected version with the reasons behind each change.

Check your code

Sign in with a free account to check code.

Try an example:

How to check and fix code with AI

  1. Paste the code into the box and pick its language.
  2. Select Check and fix to find bugs and get a corrected version, or Explain code to understand what it does.
  3. Read the explanation. For a fix, it says what was wrong and why the change solves it.
  4. Select Open in editor to run the fixed code in the online compiler and confirm it works.

What the AI code checker finds

  • Syntax errorsMissing brackets, colons or semicolons, misspelled keywords and wrong indentation.
  • Logic bugsLoops that skip an item, conditions that are always true, and integer division where you wanted decimals.
  • Runtime errorsIndex out of range, dividing by zero, null or undefined values and wrong types.
  • Clearer codeExplanations that walk through what each part does, useful for homework, reviews and unfamiliar code.

Frequently asked questions

What does the AI code checker do?

It reads your code and does one of two things. Explain describes what the code does in plain language. Check and fix looks for bugs and syntax errors and returns a corrected version with an explanation of the changes.

Which languages can it check?

Python, C, C++, C#, Java, JavaScript, TypeScript, Go, Rust, PHP, Ruby, Kotlin and Swift.

Is it just a syntax checker?

No. It catches syntax errors, but it also looks for logic mistakes such as off-by-one loops, wrong conditions or missing edge cases, because the AI reads what the code is meant to do. Run the fixed code in the editor to confirm it works.

Is it free?

Yes. Sign in with a free account to get a daily AI token quota. When you run out, you can watch a short ad for more tokens or wait for the quota to reset.

Can I run the fixed code?

Yes. Select Open in editor to run it in the online compiler for that language, compare it with your version, debug it or keep improving it.