Add Watermark on Images using PHP

Posted on Updated on - by Arjun

One of the most common approach to brand/protect images is watermarking. Here I would like to show you how to use PHP to add a watermark on 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.

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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.

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

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Arjun
I am Arjun from Hyderabad (India). I have been working as a software engineer from last 7+ years, and its my passion to learn new things and implement them as a practice. Aside from work, I likes gardening and spending time with pets.

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