Swift String Obfuscator

Swift string obfuscation is the practice of transforming readable string literals in Swift source code into equivalent but hard-to-read representations that produce the same string at runtime. Instead of writinglet apiKey = "abc123", the string is encoded as a hex byte array, Base64 Data payload, XOR-encrypted Data block, Unicode scalar array, or split concatenated expression. The code executes identically but the actual string value is hidden from static analysis, casual code inspection, and simple string searches in decompiled IPA binaries.

The obfuscator processes your input string through five independent techniques, each generating valid Swift code. Here is how each technique transforms the input:

1. Hex Byte Array: Each character is converted to its hex byte value (0x48, 0x65, 0x6C) and stored in a [UInt8] array. The string is reconstructed at runtime via String(cString:) with a null terminator. This technique is compile-time efficient and produces no runtime overhead beyond array construction.
2. Data + Encoding: The entire string is Base64-encoded into an alphanumeric string. At runtime, Data(base64Encoded:) decodes the Base64 payload, and String(data:encoding:) converts it to the original string using UTF-8 encoding. The encoded form contains no visible traces of the original text.
3. XOR Data: Each byte of the input is XORed with a configurable key byte (0-255). The obfuscated output stores the XORed bytes as a Data literal. At runtime, map() iterates over each byte and XORs it again with the same key to reconstruct the original. The key is embedded in the code but not easily distinguishable from the obfuscated data.
4. Unicode Scalar Array: The string is decomposed into individual Unicode scalar values, each expressed as a decimal code point. These are assembled into a [UnicodeScalar] array via map() and passed to String(String.UnicodeScalarView) to reconstruct the original string. Handles all Unicode characters including emoji and special symbols.
5. Split Concatenation: The string is split at a random position into two Base64-encoded parts, each decoded independently at runtime and concatenated with the + operator. The complete string is never visible in a single location, making it harder for static analysis to extract the full value.

The Swift string obfuscator transforms any string literal you provide into obfuscated Swift code. The transformation covers the following aspects:

• String Content: The actual text content is encoded, so the original words, characters, and symbols are not directly visible in the obfuscated source code.
• String Length: The length of the original string is not immediately apparent from the obfuscated form, especially with hex byte array and XOR techniques where all bytes look similar.
• Character Distribution: Frequency analysis of the original string is obscured. Common letters and patterns are uniformly distributed through techniques like XOR encryption and Base64 encoding.
• Variable Association: The variable name is configurable, allowing you to use generic names like “s” or “x” instead of descriptive names like “apiKey” or “secretToken”.

Our Swift string obfuscator processes everything locally in your browserusing client-side JavaScript. Your input strings, the generated obfuscated Swift code, and any XOR keys are never transmitted over the network, stored on a server, or logged. There are no file size limits, no registration required, and no usage caps. The tool is completely freeand works offline after the initial page load. For maximum protection in production iOS/macOS apps, combine string obfuscation with Swift’s compiler optimizations (-Oand -whole-module-optimization) and consider using Apple’s striptool to remove debug symbols from your final binary.