Code issues and fixes will be displayed here.
Four simple steps
How to use this tool?
This free online AI code checker analyzes source code for bugs, performance issues, security concerns, and best-practice violations, then suggests practical fixes.
- Step 1
Choose a language
Select the programming language of the code you want to check.
- Step 2
Add your code
Type, paste, or upload your source code in the input editor.
- Step 3
Run the check
Click Check Code to analyze the code and identify potential issues.
- Step 4
Review the results
Review the issues found, suggested fixes, and corrected code.
Why use the checker
How is this different from a linter?
Traditional linters check syntax and basic style against predefined rules. This AI code checker also understands your code’s logic, helping it find semantic bugs, performance problems, security concerns, and best-practice violations.
Common questions
Frequently Asked Questions
How does CodeConvert AI's code checker work?
CodeConvert AI's code checker uses advanced large language models to analyze your code for bugs, performance issues, readability problems, and best-practice violations. Simply paste your code, select the programming language, and click Check Code. You'll get a detailed report of issues found along with corrected code in seconds.
What programming languages are supported?
Our code checker supports over 50 programming languages including Python, JavaScript, TypeScript, Java, C++, C#, Go, Rust, Ruby, PHP, Swift, Kotlin, R, Lua, and many more.
Is the code checker free to use?
Yes. You can use the free code checker without creating an account for up to 5 checks per day. For more checks and higher limits, sign in for free — every account gets 5 free credits with support for up to 25,000 characters of input code per check.
How is this different from a linter?
Traditional linters check for syntax errors and basic style violations based on predefined rules. This AI code checker goes much further — it understands your code's logic and can find semantic bugs, suggest performance optimizations, identify security concerns, and explain issues in plain English. It also provides corrected code, not just error messages.
Does the tool fix my code automatically?
Yes. In addition to identifying issues, the tool provides a corrected version of your code with all fixes applied. Each issue is explained with a severity level and a code snippet showing the fix, so you can understand what changed and why.
Do I need to sign up to use the code checker?
No. You can use the free code checker without signing up or creating an account for up to 5 checks per day. Just paste your code, select the language, and click Check Code. Sign in for free to get 5 free credits with higher limits.
Can I also convert, generate, or explain code?
Yes! CodeConvert AI offers a full suite of free tools. You can convert code between 50+ languages with the Code Converter, generate code from plain-English descriptions with the Code Generator, or get step-by-step explanations with the Code Explainer. Try the Code Explainer
What are the benefits of signing in?
Signing in unlocks CodeConvert AI's Pro tool, which includes more powerful AI models, an integrated chat assistant, code execution, personal notes, conversion history, and an enhanced interface. Every account gets 5 free credits with support for up to 25,000 characters of input code per check — no credit card required.
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