Source Code Analyzer
Analyze your source code for logic, issues and insights
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Have you ever opened a file and realised nobody left in the team knows what it does? Nine hundred lines, three nested callbacks, one comment from 2019 that stopped being true years ago. Source Code Analyzer reads what you paste and explains it back in plain English, at whatever level you need.
Short answer: Source Code Analyzer is a free AI tool that explains pasted code in plain language. You choose how deep the explanation goes, who it is written for, and whether it arrives as prose, inline comments or a doc comment.
What is Source Code Analyzer?
Source Code Analyzer is a code explanation tool on EizTools. Paste a function, a class or a short file, and it tells you what the code does, why it is built that way and where the awkward parts sit.
The options panel behind Source Code Analyzer is its own, built for explaining rather than fixing. Nothing runs, and nothing outside your paste is visible, so a call to code you did not include is described from its name alone.
Who Ends Up Pasting Code Into It
Four kinds of reader turn up here, wanting different answers from the same file.
- A new hire on day three, handed a legacy service and a ticket, who needs its shape before touching anything.
- A reviewer facing a large pull request written in a language they use twice a year.
- A student reading a public repository, working out why the author structured it that way.
- A founder with no coding background, checking what a contractor actually delivered.
How Does Source Code Analyzer Work?
Paste the code into the prompt box, then add one line saying what you already know and what you want out of it. That single line steers the answer more than any dropdown. Pick a model from the selector and open advanced options.
Generate, then use Copy to move the explanation into your notes or download it as TXT. The activity history panel keeps earlier explanations for the session, which helps when you work through a large file in pieces.
Explanation Depth, Audience And Output Format
Three dropdowns do most of the work here.
| Option | What it changes | Where to start |
|---|---|---|
| Explanation Depth | How closely the answer tracks the code | High-Level for a first pass, Line-by-Line when one block is the problem |
| Audience | The vocabulary and what it assumes you know | Beginner while learning a language, Non-Technical when someone else needs the answer |
| Output Format | The shape the explanation arrives in | Plain Explanation to read now, Doc Comment to paste above a function |
| Language | Which syntax rules it reads by | Auto-Detect, unless the snippet could belong to two languages |
The toggles cover the rest. Add Examples and Add Summary are already on. Line-by-Line and Note Edge Cases start off, and Note Edge Cases is worth flipping when you review rather than read. The Depth slider sits at 60 percent.
Tip Split a long file. One class at a time keeps the explanation specific. A whole file at once gets summarised, and the summary is where the detail you needed disappears.
Where It Earns Its Place In A Week
Documenting the undocumented
Set Output Format to Doc Comment and paste the result straight above the function it describes.
Decoding a regular expression
Ask what a pattern matches and get a sentence back, plus sample strings that pass and fail.
Briefing people who do not code
Audience set to Non-Technical turns a change into something a client or manager can sign off.
When the explanation turns up a real bug rather than a design you had missed, Error Fixer is the next stop.
EizTools runs a free tool for each job, with no account and no sign up, plus a model selector so you decide which AI handles the request. Deep explanations get long. When all you need is the short version for a ticket, the Text Summarizer will cut it down to a few lines.
Frequently Asked Questions
How much code can I paste at once?
One class or one long function is the sweet spot. Very long files come back compressed into a summary, so split them and run the pieces separately whenever you want real detail on each part.
Can it explain code to someone who does not program?
Yes. Set Audience to Non-Technical and the answer drops the jargon, describing what the code achieves rather than how it is written. That version is useful for briefing a client or a manager.
Will it find bugs in my code?
Finding bugs is not the job here. It explains what the code does, and Note Edge Cases will flag inputs that look risky. For an actual diagnosis and fix, use a debugging tool instead.
Can I get the explanation as comments in the code?
Yes. Output Format set to Inline Comments returns the code annotated line by line. Doc Comment gives you a single block to paste above a function, which suits documentation work better.
Code you cannot explain is code you cannot safely change, whether you wrote it or inherited it. Paste the file you have been avoiding into the box above, pick the depth that fits your question, and read it back in words.
Sabir Bepari
Founder of EizTools and a passionate AI enthusiast dedicated to building practical, user-friendly AI tools that simplify everyday tasks.
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