☕ Java Formatter

Beautify messy Java code — supports Java 8 – 21, Spring Boot, Lombok, records and sealed classes.

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Paste Java code on the left to see formatted output

Auto-formats as you type · 100% private · Java 8 – 21

About Java Formatter

Consistent code formatting is essential for readability, code review efficiency, and long-term maintainability of Java projects. This browser-based Java formatter beautifies messy or minified Java code with zero server round-trips — paste your code and get cleanly indented, consistently spaced output in milliseconds. It supports Java 8 through 21, covering modern language features like records, sealed classes, text blocks, switch expressions with yield, and pattern matching instanceof.

Whether you are formatting a full Spring Boot service class, a Lombok-annotated POJO, a stream pipeline, or a snippet pasted from Stack Overflow, this tool applies the Google Java Style Guide conventions by default — with options to switch between K&R and Allman brace styles, adjust line wrap length, and sort import groups. All processing runs in your browser; your code never leaves your device.

How to format Java code

Paste your Java code into the left panel — a full class file, a method, a code block, or a snippet.
Select the code type (Full Class, Method/Field, Code Block, or Expression) to help the formatter parse ambiguous input correctly.
Choose your preferred brace style — K&R (opening brace on the same line, Java convention) or Allman (opening brace on a new line).
Set the indent size (2 or 4 spaces, or Tab) and line wrap length.
Enable Sort Imports to group and alphabetise import statements by package.
Copy the formatted output with the ⎘ Copy button.

Features

📄 Full Class / File

Format complete .java files: package declaration, import groups, class body, inner classes, enums, and annotations.

🔧 Method / Field

Format individual method declarations, field definitions, constructor signatures, and Lombok-annotated classes.

📦 Code Block

Format statement blocks, switch-case, try-catch-finally, for/while loops, and nested control structures.

⚡ Expressions

Format lambda expressions, method references, stream chains, ternary expressions, and record constructors.

🎯 K&R vs Allman

K&R keeps { on the same line (Java convention). Allman puts { on a new line, used in some enterprise codebases.

🔤 Sort Imports

Groups imports: static first, then java.*, javax.*, org.*, com.*, and others — each group alphabetically sorted.

📏 Line Wrap

Wraps long method signatures, chained calls, and string concatenations. Adjustable from 60 to 180 characters per line.

🌟 Java 21 Support

Records, sealed classes with permits, pattern matching instanceof, switch expressions with yield, and text blocks.

Frequently Asked Questions

What Java versions does this formatter support?

Java 8 through 21. This includes Java 8 lambdas and streams, Java 14+ records, Java 17 sealed classes and pattern matching, Java 15+ text blocks, and Java 21 pattern matching in switch expressions. If you are using Java 22+ features, formatting may still work for most code but edge cases with very new syntax may not be handled perfectly.

What is the difference between K&R and Allman brace styles?

In K&R style (the Java convention and Google Java Style Guide default), opening braces appear at the end of the statement line: public void method() {. In Allman style, opening braces appear on their own line: public void method() followed by { on the next line. Both styles produce valid Java — the choice is a team convention.

Does this formatter sort imports correctly for Spring Boot projects?

Yes. Import sorting groups imports as: static imports first, then java.*, javax.*, jakarta.*, org.springframework.*, org.*, com.*, and other packages. Each group is sorted alphabetically with a blank line between groups. This matches the convention used by IntelliJ IDEA and the Google Java Style Guide. When Sort imports is off, your original import order is preserved exactly.

Can I format Java code that uses Lombok annotations?

Yes. Lombok annotations like @Data, @Builder, @AllArgsConstructor, @NoArgsConstructor, @Getter, @Setter, @Slf4j, and others are treated as standard annotations and formatted accordingly. The formatter does not process Lombok's generated code — it formats the source as written.

Why does my formatted code look different from IntelliJ's auto-format?

This tool parses your code with a real Java parser (Prettier's Java plugin) running entirely in your browser, falling back to a fast pattern-based engine for fragments the parser cannot handle. For the vast majority of code the output matches IDE formatters closely, but individual wrapping decisions on very long expressions may differ slightly from IntelliJ's or Eclipse's own algorithms. The Google Java Style preset uses 2-space indent and 100-column lines; Java Standard uses 4-space indent and 120 columns.

Java code formatter: clean snippets and improve readability

Consistent code formatting is one of the cheapest forms of code quality. When all Java code in a project follows the same indentation, brace placement, and line-length rules, reviews focus on logic rather than style, onboarding is faster, and diffs in version control are cleaner.

Braxik's Java formatter cleans the indentation, brace alignment, spacing, and line breaks of Java code snippets. It is designed for quick formatting of classes, methods, annotations, lambdas, records, and configuration snippets that you want to share, document, or review — without the overhead of setting up a full IDE or build tool.

The formatter is especially useful for developers who share Java code in Slack threads, GitHub comments, documentation pages, or Stack Overflow questions. Unformatted code pasted into those contexts is disproportionately difficult to read and review. A quick format pass makes the structure immediately clear.

This tool complements IDE formatters and build-time tools like google-java-format and Spotless. It handles ad-hoc snippets quickly, while your project's committed formatter handles the canonical style for production code in version control.

How it works

The formatter parses the Java source code into a token stream and abstract syntax tree, then rebuilds the source text according to configurable style rules. It handles class declarations, method bodies, annotations, generics, lambda expressions, switch expressions, records, and sealed classes.

Indentation is applied recursively based on block depth. Braces are placed according to the Allman or K&R style depending on the selected option. Blank lines between methods, fields, and class sections are normalised to a consistent count. Import statements can optionally be sorted into standard Java groups.

Because the formatter works on source text rather than compiled bytecode, it requires syntactically parseable input. Methods without a class body, incomplete generic types, or severely malformed code may not format correctly. Complete class definitions or well-formed method bodies give the best results.

Common uses

Format copied Spring Boot controller, service, repository, mapper, or DTO snippets before sharing them in code review comments.
Clean up auto-generated Java code from OpenAPI generators, Swagger codegen, or JPA entity generators before manual review.
Normalise indentation in documentation examples before publishing to Confluence, Notion, or internal wikis.
Format Java code examples before pasting them into Stack Overflow questions or answers.
Clean up vendor-provided Java SDK samples that use different formatting conventions from your team.
Format generated JAXB or Protocol Buffer Java classes before adding them to version control.
Quickly tidy a method before sharing it in a technical interview or pair programming session.

Before you rely on the result

Run your project's committed formatter (Spotless, google-java-format, or IDEA formatter) before committing to match your team's exact style rules. This browser tool is for ad-hoc formatting, not a replacement for your project formatter.
Do not rely on formatting to reveal syntax errors or missing imports — a syntax error will either prevent formatting or produce malformed output, and missing imports are not visible from the code structure alone.
Review long chained method calls, complex lambda expressions, and Stream pipelines for readability after formatting — auto-formatted chains can sometimes be harder to read than manually line-broken versions.
Check that annotation placement is correct after formatting — Spring annotations (@Autowired, @Value, @RequestMapping) must be on their own line immediately above the annotated element.
Verify that generic type parameters, wildcard types, and bounded wildcards are correctly spaced after formatting — formatters occasionally add or remove spaces around < and > in ways that look odd.
For record classes and sealed classes (Java 16+), verify that the compact constructor and component fields are formatted as expected by your team's style guide.
If you are formatting code that uses Java modules (module-info.java), test the formatter output against your module setup since module declarations have specific syntax requirements.