diff --git a/Sources/Extensions/Extension+String.swift b/Sources/Extensions/Extension+String.swift
new file mode 100644
index 0000000..2c53b73
--- /dev/null
+++ b/Sources/Extensions/Extension+String.swift
@@ -0,0 +1,92 @@
+//
+//  Extension+String.swift
+//  Extensions
+//
+//  Created by ilker on 17.12.2024.
+//
+import Foundation
+import UIKit
+
+extension String {
+    /// Returns localized string from legacy strings catalog
+    /// - Returns: Localized string if found in Localizable.strings, otherwise returns self
+    /// - Note: This extension uses the main bundle and "Localizable.strings" file by default
+    public var localized: String {
+        return NSLocalizedString(self, tableName: "Localizable", bundle: .main, value: self, comment: "")
+    }
+    
+    /// Checks if string is empty or contains only whitespace and newline characters
+    /// - Returns: True if string is empty or contains only whitespace
+    public var isBlank: Bool {
+        return trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
+    }
+    
+    /// Checks if string contains only numeric characters
+    /// - Returns: True if string contains only numbers
+    public var isNumeric: Bool {
+        return !isEmpty && rangeOfCharacter(from: CharacterSet.decimalDigits.inverted) == nil
+    }
+    
+    /// Checks if string is a valid email format
+    /// - Returns: True if string matches basic email pattern
+    public var isValidEmail: Bool {
+        let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
+        let emailPred = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
+        return emailPred.evaluate(with: self)
+    }
+    
+    /// Converts string to url encoded string
+    /// - Returns: URL encoded string or empty string if encoding fails
+    public var urlEncoded: String {
+        return self.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? ""
+    }
+    
+    /// Converts string to url decoded string
+    /// - Returns: URL decoded string or self if decoding fails
+    public var urlDecoded: String {
+        return self.removingPercentEncoding ?? self
+    }
+    
+    /// Converts first character of string to uppercase
+    /// - Returns: String with first letter capitalized
+    public var capitalizedFirst: String {
+        return prefix(1).capitalized + dropFirst()
+    }
+    
+    /// Converts string to Base64 encoded string
+    /// - Returns: Base64 encoded string
+    public var base64Encoded: String {
+        return Data(self.utf8).base64EncodedString()
+    }
+    
+    /// Converts Base64 encoded string back to normal string
+    /// - Returns: Decoded string or empty string if decoding fails
+    public var base64Decoded: String {
+        guard let data = Data(base64Encoded: self) else { return "" }
+        return String(data: data, encoding: .utf8) ?? ""
+    }
+    
+    /// Extracts all numbers from string
+    /// - Returns: String containing only numeric characters
+    public var extractNumbers: String {
+        return components(separatedBy: CharacterSet.decimalDigits.inverted)
+            .joined()
+    }
+    
+    /// Creates an attributed string with the specified color
+    /// - Parameter color: UIColor to apply to the string
+    /// - Returns: NSAttributedString with the specified color
+    public func colored(_ color: UIColor) -> NSAttributedString {
+        return NSAttributedString(string: self, attributes: [.foregroundColor: color])
+    }
+    
+    /// Converts string to slug format (lowercase, no spaces, only hyphens)
+    /// - Returns: Slugified string
+    public var slugified: String {
+        return self.lowercased()
+            .replacingOccurrences(of: " ", with: "-")
+            .folding(options: .diacriticInsensitive, locale: .current)
+            .components(separatedBy: CharacterSet.alphanumerics.union(CharacterSet(charactersIn: "-")))
+            .joined()
+    }
+}