Free AI Code Documentation Generator
Paste your code and we generate clear docstrings, inline comments, and README-ready documentation in seconds. Free, no signup, any language.
Free forever · no signup · no credit card · unlimited
import os
# Folder to clean up — change this to your path
FOLDER = "./photos"
for i, name in enumerate(sorted(os.listdir(FOLDER)), start=1):
src = os.path.join(FOLDER, name)
if not os.path.isfile(src):
continue
ext = os.path.splitext(name)[1].lower()
dst = os.path.join(FOLDER, f"photo_{i:03d}{ext}")
os.rename(src, dst)
print(f"{name} -> {os.path.basename(dst)}")This script renames every file in a folder to photo_001, photo_002, and so on, keeping each file’s extension. Set FOLDER to your folder, then run python rename.py from a terminal.
Good documentation makes code easier to maintain, share, and hand off. FreeCodeGen documentation generator takes your code and produces clear, structured docstrings, inline comments, and plain-English explanations — instantly, for any language. Whether you are documenting your own project or trying to understand a function someone else wrote, you describe what you need and the AI writes it.
How to document your code in 3 steps
Paste your code
Paste the function, class, or script you want documented. If you have a preferred docstring format such as Google, NumPy, or JSDoc, mention it in your description.
Describe what you want
Specify the type of documentation — docstrings, inline comments, a README section, or a plain-English explanation of what the code does.
Copy and apply
Copy the generated documentation and apply it to your codebase. Review for accuracy — the AI reads your code, but you know your intent better than it does.
About the code documentation generator
Documentation is the part of software development that almost everyone postpones — and regrets skipping. A function without a docstring is fine when you wrote it last week; six months later, you or a colleague will spend 20 minutes re-reading the implementation to figure out what the parameters are and what the return value means.
FreeCodeGen documentation generator reads your code and writes the documentation for you. For Python, it produces Google-style, NumPy-style, or Sphinx-style docstrings depending on what you ask — covering the function purpose, parameters with their types and expected values, return value, raised exceptions, and usage examples. For JavaScript and TypeScript, it generates JSDoc comments. For SQL, it writes inline comments explaining each clause and any business logic in the query.
Beyond docstrings, the generator can produce: plain-English explanations of what a block of code does (useful when inheriting someone else code), README sections explaining how to install and run a project, API documentation stubs, and inline comments for complex logic that is not self-explanatory.
For best results: paste the complete function or class, mention the docstring style if you have a preference, and note any domain-specific context that is not obvious from the code — for example, noting that a function processes Stripe webhook payloads tells the AI something useful it cannot infer from variable names alone.
Generated documentation should be reviewed before committing. The AI reads the code as written — it cannot know your intent if the implementation diverges from what you meant. Treat the output as a first draft and correct anything that does not accurately describe the behavior. FreeCodeGen is free with no signup — document as much code as you need.
Frequently asked questions
Which docstring formats does it support?
Google style, NumPy style, Sphinx (reStructuredText), JSDoc for JavaScript and TypeScript, and plain English summaries. Mention the format you want in your description.
Can it document code in any programming language?
Python, JavaScript, TypeScript, Java, C#, Go, Ruby, PHP, SQL, and others. Paste your code, describe what you need, and the AI adapts.
Can it explain code written by someone else?
Yes — paste the code and ask it to explain what this does in plain English. Useful for understanding inherited codebases or open-source functions you are integrating.
Is it free? Do I need to sign up?
Completely free, no signup required. Document as much code as you need with no account.