Your Code

Claude API Key Free at console.anthropic.com · stored in session only

          ✨ How to use:

          1. Get a free API key at console.anthropic.com

          2. Paste your API key above

          3. Paste any code in the left panel

          4. Choose an action or type a question

          5. Click Ask Claude

          Your API key and code go directly from your browser to Anthropic. itsseven never sees them.

AI Code Explainer Online — Understand Any Code with Claude AI — Free Online Tool

Paste any code and get a clear AI explanation. Powered by Claude. Explain code, find bugs, optimize, add comments, convert languages. Add your Anthropic API key to start.

Free Forever

No Signup

No Upload

100% Private

Browser-based

Features

Built for real developer workflows. No fluff, just the tools you need.

✨

Plain English Explanations

Claude reads your code and explains what it does — function by function — in language anyone can understand.

🐛

Bug Detection

Identify bugs, edge cases and potential security issues with specific line-level feedback.

⚡

Code Optimization

Get suggestions for performance, readability and best practices specific to your language.

🔄

Language Conversion

Convert between JavaScript, Python, SQL, TypeScript, Go, Rust, Java and more.

📝

Comment Generation

Generate clear inline comments and docstrings for any function, class or module.

🔒

Direct to Anthropic

Your code goes directly from your browser to the Anthropic API using your own key. itsseven never sees it.

How to use

Get results in seconds — no account, no file upload required.

Add your Claude API key

Get a free key at console.anthropic.com. Paste it into the API key field. It stays in your browser session only.

Paste your code

Paste any code — JavaScript, Python, SQL, Rust, Go, Java, C++, TypeScript, Bash — into the left panel.

Ask a question and get an answer

Choose Explain, Find Bugs, Optimize, or type a specific question. Click Ask Claude for a detailed answer in seconds.

More free tools

Every tool at itsseven is free, private and browser-based.

Frequently asked questions

Is my code private?

▾

Your code goes directly to the Anthropic API using your personal key. itsseven does not receive, store or log any code.

Do I need to pay?

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Anthropic offers a free tier for new accounts. Usage beyond the free tier is billed per token. Check anthropic.com/pricing for current rates.

Which languages are supported?

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Claude understands virtually all programming languages — JavaScript, TypeScript, Python, Java, C, C++, C#, Rust, Go, PHP, Ruby, Swift, Kotlin, SQL, Bash, R and more.

Can it explain minified code?

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Claude can infer meaning from minified code but accuracy drops significantly. Beautify the code first using JS Formatter for better results.

Can it generate new code?

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Yes. Describe what you need in the question field and Claude generates working code. Always review AI-generated code before production use.

What Claude model is used?

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claude-sonnet-4-5-20251001 — Anthropic's capable and efficient model. Update the model string in the source if a newer version is available.