What does the Java formatter do?

It auto-indents Java code, normalizes brace placement, adds consistent spacing around operators and keywords, and removes redundant blank lines — following standard Java style conventions.

Does it change my code logic?

No. The formatter only affects whitespace and indentation. It never renames variables, removes code, or changes logic.

Can I upload a .java file?

Yes. Click the upload button to select a .java file. The tool reads the file and displays the formatted output ready to copy.

Does it support Java 17+ features?

Yes, the formatter handles modern Java syntax including records, sealed classes, text blocks, pattern matching, and switch expressions introduced in Java 14–21.

Is there a character limit?

The tool handles typical Java class files comfortably. For extremely large generated files (10,000+ lines), consider using an IDE formatter (IntelliJ IDEA, Eclipse) instead.

Java Code Formatter — Free Online Tool

Indent:

Java Input

1 lines

Formatted Java

public class BankAccount {
    private String owner;
    private double balance;
    public BankAccount(String owner,double initialBalance) {
        this.owner=owner;
        this.balance=initialBalance;
    }
    public void deposit(double amount) {
        if(amount<=0) {
            throw new IllegalArgumentException("Deposit amount must be positive");
        }
        balance+=amount;
    }
    public boolean withdraw(double amount) {
        if(amount<=0||amount>balance) {
            return false;
        }
        balance-=amount;
        return true;
    }
    public double getBalance() {
        return balance;
    }
    @Override public String toString() {
        return "BankAccount{owner='"+owner+"', balance="+balance+"}";
    }
}

All formatting happens in your browser — your data never leaves your device.

What is a Java Formatter?

A Java Formatter auto-indents and cleans Java source code, normalizing brace placement, spacing around operators, and blank line usage according to standard Java style conventions (similar to Google Java Style Guide). It works on any Java code from Java 8 through Java 21.

How to Use It

1Paste Java code or upload a .java file
2Click 'Format' to apply standard Java formatting
3Copy the formatted code or download it as a .java file
4For large codebases, use your IDE's built-in formatter (IntelliJ/Eclipse) instead

Example

Pasting unindented Java code with inconsistent spacing → formatter applies consistent 4-space indentation, places opening braces on the same line as the method signature, and normalizes spaces around operators.

Why Use It

Clean up code before submitting to code review or open-source projects
Standardize formatting when merging code from multiple contributors
Quickly reformat code pasted from documentation or Stack Overflow
Prepare Java code samples for blog posts or technical documentation