Objective-C to Swift Online Converter

Migrating an iOS or macOS project from Objective-C to Swift is one of the most common refactoring tasks for Apple platform developers. The two languages have very different syntax — Objective-C uses message-passing square-bracket syntax, NS-prefixed Foundation types, and a separate header/implementation file structure, while Swift uses dot-syntax method calls, value types, and a single unified source file.

This online converter handles the mechanical part of the migration automatically: it replaces NS* types with their Swift equivalents (NSString → String, BOOL → Bool, NSInteger → Int), converts @interface and @implementation class declarations to Swift class syntax, translates @property attributes to Swift var/let declarations, and converts Objective-C message sends like [obj method:arg] to obj.method(arg).

The conversion runs entirely in your browser — your source code is never sent to a server. You can use the tool offline once the page has loaded.