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copied!<p>The following will do to the RGB to hex conversion and add any required zero padding: </p> <pre><code>function componentToHex(c) { var hex = c.toString(16); return hex.length == 1 ? "0" + hex : hex; } function rgbToHex(r, g, b) { return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b); } alert( rgbToHex(0, 51, 255) ); // #0033ff </code></pre> <p>Converting the other way:</p> <pre><code>function hexToRgb(hex) { var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex); return result ? { r: parseInt(result[1], 16), g: parseInt(result[2], 16), b: parseInt(result[3], 16) } : null; } alert( hexToRgb("#0033ff").g ); // "51"; </code></pre> <p>Finally, an alternative version of <code>rgbToHex()</code>, as discussed in @casablanca's answer and suggested in the comments by @cwolves:</p> <pre><code>function rgbToHex(r, g, b) { return "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1); } </code></pre> <h2>Update 3 December 2012</h2> <p>Here's a version of <code>hexToRgb()</code> that also parses a shorthand hex triplet such as "#03F":</p> <pre><code>function hexToRgb(hex) { // Expand shorthand form (e.g. "03F") to full form (e.g. "0033FF") var shorthandRegex = /^#?([a-f\d])([a-f\d])([a-f\d])$/i; hex = hex.replace(shorthandRegex, function(m, r, g, b) { return r + r + g + g + b + b; }); var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex); return result ? { r: parseInt(result[1], 16), g: parseInt(result[2], 16), b: parseInt(result[3], 16) } : null; } alert( hexToRgb("#0033ff").g ); // "51"; alert( hexToRgb("#03f").g ); // "51"; </code></pre>

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