Java Formatter
Format and beautify Java source code with structured indentation and cleaner layout
Best For
Clean up copied code, minified snippets, or messy indentation before code reviews and documentation.
Style Rule
Powered by Prettier with the prettier-plugin-java parser: 2-space indentation and 100-character lines.
Before & After Java Formatting
See the difference one click makes. The formatter parses your Java source and rebuilds it with consistent 2-space indentation, sane line breaks, and Google Java Style-inspired spacing — without changing a single token of logic.
public class OrderService{private final Map<String,Double> prices=new HashMap<>();public double checkout(List<String> items){double total=0;for(String item:items){Double price=prices.get(item);if(price==null){throw new IllegalArgumentException("Unknown item: "+item);}total+=price;}if(total>100){return total*0.9;}return total;}}public class OrderService {
private final Map<String, Double> prices = new HashMap<>();
public double checkout(List<String> items) {
double total = 0;
for (String item : items) {
Double price = prices.get(item);
if (price == null) {
throw new IllegalArgumentException("Unknown item: " + item);
}
total += price;
}
if (total > 100) {
return total * 0.9;
}
return total;
}
}Professional Java Formatter Processing Features
Everything you need to work with Java Formatter data efficiently and professionally
Syntax Error Detection
Invalid Java is reported instantly with the error position, so a stray brace or missing semicolon never silently breaks your reformat.
Structured Code Layout
Rebuild classes, methods, and control-flow blocks with consistent 2-space indentation and brace-aware line splitting at 100 characters.
Consistent Team Style
Paste any team member's code and get the same layout — the deterministic Prettier engine removes style debates from code review.
Modern Java Support
Full support for records, sealed classes, switch expressions, text blocks, var, lambda expressions, and annotated generics.
Instant Processing
Format large Java files up to 10MB entirely in your browser with zero server round-trips and no data uploads.
Zero Setup
No IDE plugins, no Maven or Gradle config, no command line. Open the page, paste Java code, click once, and copy the result.
How It Works
Simple steps to process your Java Formatter like a pro
Paste Java Code
Paste your Java source code into the input area, or load the sample class to see the formatter in action.
Click Format
One click runs the Prettier engine with sensible Java defaults — no configuration needed.
Inspect the Result
Review the rebuilt code with clean indentation, line breaks, and spacing. Syntax errors, if any, are shown with their position.
Copy & Use
Copy the formatted Java to your clipboard and paste it straight back into your IDE or project.
Professional Java Formatter Formatter & Validator
Java Formatter processing runs entirely in your browser — no uploads, no accounts, no limits.
Processing method
Use this tool’s examples, syntax limits and source documentation to understand its output.
Key Technical Features:
- • Built on Prettier and prettier-plugin-java, an open-source Java parser
- • Syntax errors are reported with the exact position so you can fix them fast
- • Understands modern Java: records, sealed classes, switch expressions, and text blocks
- • Client-side WebAssembly-grade processing for maximum security and speed
- • Handles files up to 10MB directly in your browser
Processing and output
Check the stated processing method and compare the result with your input before using it.
Security & Privacy:
- • 100% client-side processing - data never sent to servers
- • No tracking, cookies or data collection
- • HTTPS encryption for secure connections
- • Open-source formatting engine you can inspect yourself
- • GDPR and CCPA compliant approach
Why Professionals Choose EZ Formatter
Your data stays in your browser
Frequently Asked Questions
Common questions about Java Formatter formatting answered
Yes, our Java formatter is completely free with no registration required. All processing happens in your browser.
It uses Prettier with the prettier-plugin-java parser — the same open-source combination used in IDEs and build pipelines. That means deterministic output: the same input always produces the same formatted code.
Yes. The formatter supports modern Java syntax including records, sealed classes, pattern matching, switch expressions, and text blocks introduced in recent Java versions.
Its defaults align closely with Google Java Style: 2-space indentation and a 100-character line width. Note that it is Prettier-based rather than a google-java-format port, so a few edge cases like import ordering may differ.
Never. The formatter engine is downloaded to your browser once and all parsing and formatting run locally on your machine. Your code is not sent, stored, or logged anywhere.
The Google Java Style Guide as the base: 2-space indent, 100-column limit, braces on the same line (K&R). An alternate profile follows the Oracle/AOSP 4-space convention - Java is one of the few ecosystems where both styles are widespread, which is why the profile switch exists.
Parameter and local-variable annotations stay on the same line as their element (@Override public void run()), while type-use annotations remain glued to the type. Declaration annotations for generated code patterns (Lombok @Builder, JPA @Entity) each get their own line above the declaration - the convention both IntelliJ and Eclipse formatters produce.
Wildcards (List<? extends Number>) keep their spacing exactly; lambda bodies get consistent arrow spacing (x -> x * 2) with block bodies indented; records (Java 16+) and sealed interfaces format like classes with their compact constructors preserved. Switch expressions with -> arms align their cases, matching the java.util formatting examples in JDK docs.
Authoritative References
Standards and official documentation that define the formats this tool works with.
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