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    <p>This is a category applied to NSData that I wrote. It returns a hexadecimal NSString representing the NSData, where the data can be any length. Returns an empty string if NSData is empty.</p> <p><strong>NSData+Conversion.h</strong></p> <pre><code>#import &lt;Foundation/Foundation.h&gt; @interface NSData (NSData_Conversion) #pragma mark - String Conversion - (NSString *)hexadecimalString; @end </code></pre> <p><strong>NSData+Conversion.m</strong></p> <pre><code>#import "NSData+Conversion.h" @implementation NSData (NSData_Conversion) #pragma mark - String Conversion - (NSString *)hexadecimalString { /* Returns hexadecimal string of NSData. Empty string if data is empty. */ const unsigned char *dataBuffer = (const unsigned char *)[self bytes]; if (!dataBuffer) return [NSString string]; NSUInteger dataLength = [self length]; NSMutableString *hexString = [NSMutableString stringWithCapacity:(dataLength * 2)]; for (int i = 0; i &lt; dataLength; ++i) [hexString appendString:[NSString stringWithFormat:@"%02lx", (unsigned long)dataBuffer[i]]]; return [NSString stringWithString:hexString]; } @end </code></pre> <p>Usage:</p> <pre><code>NSData *someData = ...; NSString *someDataHexadecimalString = [someData hexadecimalString]; </code></pre> <p>This is "probably" better than calling <code>[someData description]</code> and then stripping the spaces, &lt;'s, and >'s. Stripping characters just feels too "hacky". Plus you never know if Apple will change the formatting of NSData's <code>-description</code> in the future.</p> <p><strong>NOTE:</strong> I have had people reach out to me about licensing for the code in this answer. I hereby dedicate my copyright in the code I posted in this answer to the public domain.</p>
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    1. USDave Gallagher
    1. USDave Gallagher
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    1. CODefinitely cleaner and more generic than what we had before. Thanks!
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      1. USsarfata
    2. COWhy does this not have more up-votes?!? This is an amazingly clean way of performing this task. +1.
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      1. USJason Whitehorn
    3. CONice, but two suggestions: (1) I think appendFormat is more efficient for large data since it avoids creating an intermediate NSString and (2) %x represents an unsigned int rather than unsigned long, although the difference is harmless.
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