Why put up with manually embedding watermarks on your images when you can have it done for you automatically using JavaScript, or in this case, PHP? This PHP snippet will make use of a image file (PNG) that you’ll create and supply, and place it on top of the photo you want watermarked at a pre-defined (e.g. bottom-left, upper-right, etc.) or exact position (by pixels).

<?php 
function watermark($file, $watermark, $pos = null, $x = 0, $y = 0){ 
 $details = getimagesize($file); 
 $wDetails = getimagesize($watermark); 
 if(!is_null($pos)){ 
 switch($pos){ 
 case TOP_LEFT: 
 $x = 0; 
 $y = 0; 
 break; 
 case TOP_RIGHT: 
 $x = $details[0] - $wDetails[0]; 
 $y = 0; 
 break; 
 case BOTTOM_LEFT: 
 $x = 0; 
 $y = $details[1] - $wDetails[1]; 
 break; 
 case BOTTOM_RIGHT: 
 $x = $details[0] - $wDetails[0]; 
 $y = $details[1] - $wDetails[1]; 
 break; 
 case CENTER: 
 $x = round(($details[0] - $wDetails[0])/2); 
 $y = round(($details[1] - $wDetails[1])/2); 
 break; 
 } 
 } 
 switch($details['mime']){ 
 case 'image/jpeg':$im = imagecreatefromjpeg($file);break; 
 case 'image/gif':$im = imagecreatefromgif($file);break; 
 case 'image/png':$im = imagecreatefrompng($file);break; 
 } 
 switch($wDetails['mime']){ 
 case 'image/jpeg':$newWater = imagecreatefromjpeg($watermark);break; 
 case 'image/gif':$newWater = imagecreatefromgif($watermark);$colorTransparent = imagecolortransparent($newWater);imagefill($newWater, 0, 0, $colorTransparent);imagecolortransparent($newWater, $colorTransparent);break; 
 case 'image/png':$newWater = imagecreatefrompng($watermark);imagealphablending($newWater, false);imagesavealpha($newWater,true);break; 
 } 
 imagecopyresampled($im, $newWater, $x, $y, 0, 0, $wDetails[0], $wDetails[1], $wDetails[0], $wDetails[1]); 
 // Output the image 
 switch($details['mime']){ 
 case 'image/jpeg':header('Content-type: image/jpeg');imagejpeg($im);break; 
 case 'image/gif':header('Content-type: image/gif');imagegif($im);break; 
 case 'image/png':header('Content-type: image/png');imagepng($im);break; 
 } 
 // Free up memory 
 imagedestroy($im); 
} 
// Watermark using only the defaults 
watermark('girl.jpg','watermark.png'); 
// Watermark using a pre-defined position 
// Valid values: TOP_LEFT, TOP_RIGHT, BOTTOM_LEFT, BOTTOM_RIGHT, CENTER 
watermark('girl.jpg','watermark.png', BOTTOM_RIGHT); 
// Watermark using an exact position 
watermark('girl.jpg','watermark.png', null, 150, 150); 
// Note that you can only use this function once per page. 
// If it is used more than one time, the image that will be displayed 
// will be the first function called. 
?>     

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