How to Crop Image using jQuery and PHP

Last modified on August 9th, 2018 by Vincy.

Cropping is an action to cut a selected portion from the original image. Image editor software like Photoshop will always have the crop tool. When we build an application to manipulate images, cropping tool is a minimum necessity.

In this article, we are going to create a crop tool in a PHP web application to crop images using jQuery. I have use the Jcrop plugin to implement dynamic image cropping functionality. This is a jQuery based plugin and it is simple and easy to integrate.

How-to-Crop-Image-using-jQuery-and-PHP

View Demo

By executing this example, the original image will be loaded on a landing page. We can select the crop area by using the mouse drag events. Once the crop area is selected, then it can be manipulated by changing the selected dimensions. The crop button’s click event will trigger the code execution to return the image blob for the cropped area. This blob data will be set as the source of the resultant image. If you are looking for a pure PHP server-side solution without using jQuery, check my earlier article to PHP image resize.

Loading Original Image in Crop Mode 

This is the initial page that loads the original image. The user can select and manage crop boundary by using the mouse drag events. This page contains the crop button on clicking of which the jQuery script will be executed to prepare cropped image output (using PHP) to show it to the browser.

<html>
<head>
<title>How to Crop Image using jQuery</title>
<link rel="stylesheet" href="jquery.Jcrop.min.css" type="text/css" />
<script src="jquery.min.js"></script>
<script src="jquery.Jcrop.min.js"></script>

<style>
body {
    width: 550px;
    font-family: Arial;
}

input#crop {
    padding: 5px 25px 5px 25px;
    background: lightseagreen;
    border: #485c61 1px solid;
    color: #FFF;
    visibility: hidden;
}

#cropped_img {
    margin-top: 40px;
}
</style>
</head>
<body>
    <div>
        <img src="img.jpg" id="cropbox" class="img" /><br />
    </div>
    <div id="btn">
        <input type='button' id="crop" value='CROP'>
    </div>
    <div>
        <img src="#" id="cropped_img" style="display: none;">
    </div>

</body>
</html>

jQuery Script to Prepare Cropped Image Source

This jQuery script handles the crop area selection and the crop action events. When the user selects the crop boundary, then the crop area coordinates and the dimensions are indexed by using the onSelect callback of the Jcorp plugin. In this script, we have specified the aspectRatio option while initializing the jCorp plugin.

The indexed data is passed to a PHP file to create the cropped image dynamically by using the PHP GD functions. Previously, we have seen how to create images using PHP image functions

<script type="text/javascript">
  $(document).ready(function(){
        var size;
        $('#cropbox').Jcrop({
          aspectRatio: 1,
          onSelect: function(c){
           size = {x:c.x,y:c.y,w:c.w,h:c.h};   
           $("#crop").css("visibility", "visible");  
          }
        });
     
        $("#crop").click(function(){
            var img = $("#cropbox").attr('src');
            $("#cropped_img").show();
            $("#cropped_img").attr('src','image-crop.php?x='+size.x+'&y='+size.y+'&w='+size.w+'&h='+size.h+'&img='+img);
        });
  });
</script>

PHP Code to Create Dynamic Image Layer to Display Cropped image

This PHP code receives the cropped image dimensions and coordinates. These data are used in creating a dynamic image layer to plot the cropped image on it. By setting the content type by using PHP header function the output image will be displayed to the browser.

<?php
  $img_r = imagecreatefromjpeg($_GET['img']);
  $dst_r = ImageCreateTrueColor( $_GET['w'], $_GET['h'] );
 
  imagecopyresampled($dst_r, $img_r, 0, 0, $_GET['x'], $_GET['y'], $_GET['w'], $_GET['h'], $_GET['w'],$_GET['h']);
  
  header('Content-type: image/jpeg');
  imagejpeg($dst_r);
 
  exit;
?>

Crop Image using jQuery and PHP – Output

This screenshot shows the original image with the crop button control. Also, the cropped image output is displayed at the bottom of this screenshot.

Crop-Image-using-jQuery-and-PHP-Output

View DemoDownload

This PHP code tutorial was published on August 9, 2018.

↑ Back to Top

Share this Article