Add Watermark on Images using PHP

Last updated on November 20, 2017

One of the most common approaches to brand/protect images is watermarking. Here I would like to show you how to use PHP to add a watermark to images. PHP uses its GD library to write text on images using true type fonts.

To add a watermark, you need an image and any font with extension ttf. For example, I will use “arail.ttf” in my tutorial. Image type can be jpg / jpeg, png, gif, wbmp.

Function to Watermark

Below function will add watermark on images and this function accepts two parameters images path and watermark text.

function createWatermarkOnImage ($imagePath, $waterMarkText){

	header ("Content-type: image/jpeg");
		
	$font = 4;
	
	$width = imagefontwidth($font) * strlen($waterMarkText) ;
	
	$height = imagefontheight($font) ;
	
	$image = imagecreatefromjpeg($imagePath);
	
	$x = imagesx($image) - $width ;
	
	$y = imagesy($image) - $height;
	
	$backgroundColor = imagecolorallocate ($image, 255,255,255);
	
	$textColor = imagecolorallocate ($image, 0,0,0);
	
	imagestring ($image, $font, $x, $y, $waterMarkText, $textColor);
	
	imagejpeg($image);	
	}

How to use

As I mentioned above, this function accepts two parameters; image path, and watermark text.

 createWatermarkOnImage ('20160514_212931.jpg', 'zueebi');