Java Code Formatter

Java code from IDEs, code generators, or copy-paste sources often arrives with inconsistent formatting — mixed indentation, missing spaces, or braces in the wrong position. A Java formatter applies the widely accepted K&R style: opening braces on the same line, proper block indentation, and consistent spacing. This tool formats entirely in your browser with no server upload.

Step 1: Paste Your Java Code

Copy your Java code — a class, a method, or an entire file — and paste it into the input area. The formatter handles classes, interfaces, methods, constructors, if/else blocks, for and while loops, try-catch-finally, switch statements, and annotations.

Step 2: Choose Indentation

Select 2 spaces, 4 spaces (standard for most Java style guides including Google Java Style and Oracle conventions), or tabs. The formatter tracks brace depth to apply the correct indentation at each level.

Step 3: Format or Minify

Click Format Java to beautify with syntax highlighting. Click Minify to strip comments and collapse whitespace — useful for comparing code sizes or creating compact snippets for documentation.

Step 4: Copy or Download

Use Copy to place the formatted code on your clipboard, or Download to save as a .java file. The status bar shows line and character counts for both input and output.

Java Formatting Best Practices

The Google Java Style Guide and Oracle's official Java code conventions both favor K&R style braces. Key rules: opening brace on the same line separated by a space, closing brace on its own line at the same indentation as the opening statement, blank line between method declarations, and space after control flow keywords (if, for, while, try). Consistent formatting makes code reviews faster and reduces cognitive load when reading unfamiliar code.