Swift Formatter
Standardize Swift code formatting with consistent indentation and spacing.
struct Product {
let id: Int
let name: String
let price: Double
var isAvailable: Bool
init(id: Int, name: String, price: Double, isAvailable: Bool = true) {
self.id = id
self.name = name
self.price = price
self.isAvailable = isAvailable
}
func formattedPrice() -> String {
return String(format: "$%.2f", price)
}
mutating func markUnavailable() {
isAvailable = false
}
}
class ProductStore {
private var products: [Product] = []
func addProduct(_ product: Product) {
products.append(product)
}
func findProduct(byId id: Int) -> Product? {
return products.first {$0.id==id}
}
func availableProducts() -> [Product] {
return products.filter {$0.isAvailable}
}
}Why consistent Swift formatting matters for iOS team projects
Swift is one of the most expressive languages for mobile development, but that expressiveness can produce wildly inconsistent codebases when different developers apply different formatting habits. Xcode's built-in re-indent shortcut (Ctrl+I) applies formatting based on the current file's indentation settings, which differ between team members unless enforced at the project level. The result: merge conflicts full of formatting noise rather than logic changes.
This browser formatter is particularly useful for cleaning up code in documentation, code review comments, Swift Playgrounds, or blog posts where you cannot run Xcode or SwiftFormat. Paste your Swift snippet, format, copy: the process takes a few seconds and produces consistent output every time.
How to format Swift code: step by step
- 1Paste your Swift code
Copy any Swift source: structs, classes, functions, SwiftUI views, or protocol definitions: and paste it into the left input panel. - 2Choose indent size
Select 2 or 4 spaces. The Swift API Design Guidelines and most open-source Swift projects use 4 spaces. Some SwiftUI-heavy codebases prefer 2 for more compact layouts. - 3Enable blank lines before func
When enabled, a blank line is inserted before each function declaration that is not at the start of a block. This improves visual separation between method definitions. - 4Optionally minify
Toggle Minify to collapse the Swift code to a single line with comments stripped: useful for embedding code in documentation strings or compact display. - 5Copy or download
Click Copy to grab the formatted output, or Download .swift to save a properly named Swift source file.
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Frequently Asked Questions
- Does this follow the Swift API Design Guidelines?
- The formatter applies the main structural rules from the Swift API Design Guidelines and common SwiftFormat conventions: consistent indentation, spaces around operators, spaces after commas, and blank lines between declarations. It is not a full SwiftFormat or SwiftLint implementation.
- What indentation size does Apple recommend for Swift?
- Apple's Swift style guide and most open-source Swift projects use 4 spaces. Xcode defaults to 4 spaces (or tab width = 4). Some teams choose 2 spaces for more compact code: both are common in the Swift community.
- Does this work with SwiftUI code?
- Yes. SwiftUI's trailing closure syntax, property wrappers (@State, @Binding, @ObservedObject), and ViewBuilder content are all standard Swift syntax and are handled by the formatter.
- Can I use this to format Objective-C?
- No: this formatter is designed for Swift only. Objective-C has fundamentally different syntax and would require a separate parser.
- Is this a replacement for SwiftFormat or SwiftLint?
- For production use, SwiftFormat (formatter) or SwiftLint (linter/formatter) integrated into your Xcode build phase or CI pipeline are the professional standard. This browser tool is ideal for quick formatting of code snippets, documentation, or code reviews.
- Does the minifier remove comments?
- Yes. The minifier removes // and /* */ comments and collapses whitespace. Use this only for code snippets where comments are not needed.
- Does the formatter handle multiline strings?
- Swift multiline string literals (triple-quoted strings) are preserved as-is to avoid changing indentation inside the string, which would alter its content.
- Is this tool free?
- Yes: completely free, no account required, and everything runs in your browser.
AlteredIdea vs alternatives
vs other online tools: Everything runs in your browser: private, instant, no account needed.
vs desktop apps: No install required. Works on any device.
vs paid tools: Completely free, unlimited use.