{"id":224738,"date":"2025-09-22T08:54:21","date_gmt":"2025-09-22T06:54:21","guid":{"rendered":"https:\/\/flexibleshipping.com\/?p=224738"},"modified":"2025-09-24T20:06:20","modified_gmt":"2025-09-24T18:06:20","slug":"add-custom-code-woocommerce-and-wordpress","status":"publish","type":"post","link":"https:\/\/octolize.com\/es\/blog\/add-custom-code-woocommerce-and-wordpress\/","title":{"rendered":"How to Add Custom Code to WooCommerce and WordPress Safely?"},"content":{"rendered":"<p><strong>One of the greatest things about WordPress and WooCommerce is that you can modify and customize your website however you want, especially when you know how to add custom code to WooCommerce and WordPress. You can use numerous plugins, different themes, or extensions. You can even write your code to create a solution exactly for your needs. In this guide, you\u2019ll learn the safest and most effective ways to add custom PHP code to your WooCommerce or WordPress site without breaking anything.<\/strong><br \/>\n<!--more--><\/p>\n<h2>Why (and When) You Should Add Custom Code to WordPress or WooCommerce<\/h2>\n<p>If you\u2019re running a WordPress site or a WooCommerce store, sooner or later you\u2019ll come across a situation where standard settings, themes, or plugins just don\u2019t cut it. You may want to:<\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Hide unnecessary elements on the product page,<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Customize the checkout process,<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Adjust shipping behavior,<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Remove default styles or scripts,<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Add small but powerful features like auto-applying a coupon, or hiding payment methods based on the shipping option.<\/span><\/li>\n<\/ul>\n<p>In most of these cases, there\u2019s no plugin that does exactly what you need, or using a plugin would be overkill, adding unnecessary weight to your website. That\u2019s when it\u2019s time to <strong>add WooCommerce code snippets<\/strong> manually. Adding custom code in WooCommerce or WordPress allows you to <b>tailor your site to your business needs<\/b> without relying on third-party tools. You can control exactly what changes are made, keep your store lightweight, and avoid bloating your site with yet another plugin.<\/p>\n<h3>When Is It a Good Idea to Add Custom Code?<\/h3>\n<p>Custom code is ideal when:<\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">You need a <\/span><b>very specific tweak<\/b><span style=\"font-weight: 400\"> that no plugin offers,<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">You want to <\/span><b>improve performance<\/b><span style=\"font-weight: 400\"> by reducing the number of active plugins,<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">You\u2019re following a <\/span><b>developer\u2019s tutorial<\/b><span style=\"font-weight: 400\"> that provides code snippets,<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">You want to <\/span><b>extend existing plugin functionality<\/b><span style=\"font-weight: 400\">,<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">You need to <\/span><b>fix theme or plugin behavior<\/b><span style=\"font-weight: 400\"> without editing core files.<\/span><\/li>\n<\/ul>\n<p>Even simple changes, like redirecting users after adding a product to the cart, can require a few lines of code. Knowing how to safely add these changes is a must-have skill for any store owner who wants more control over their WooCommerce site.<\/p>\n<h3>What You&#8217;ll Learn in This Guide<\/h3>\n<p>In this article, we\u2019ll show you <b>how to add custom code to WooCommerce and WordPress the right way: <\/b>afely, effectively, and without risking your site\u2019s stability. Whether you&#8217;re a complete beginner or someone who has pasted code snippets before but wants to do it more cleanly, you\u2019ll find step-by-step instructions and practical tips.<\/p>\n<p>Learning <strong>how to safely add custom code to WooCommerce<\/strong> helps you gain more flexibility without increasing plugin overhead. Let\u2019s get started with the best methods for adding custom code.<\/p>\n<h2>Three ways to add custom code to WooCommerce and WordPress<\/h2>\n<ul>\n<li><a href=\"#plugin\">Add WooCommerce Code Snippets with a Plugin (Code Snippets Method)<\/a><\/li>\n<li><a href=\"#functions\">Using Your Child Theme Functions.php<\/a><\/li>\n<li><a href=\"#mu-plugin\">Using Must Use Plugins<\/a><\/li>\n<\/ul>\n<h2>Which method should you use?<\/h2>\n<p>All three methods are working, but they differ in terms of complexity and safety. I will explain each of them in detail, but <strong>if you don&#8217;t know which solution to use, please read this paragraph first<\/strong>.<\/p>\n<p><strong>If you are a complete beginner<\/strong> in WordPress and the thought of adding custom code scares you, you can <strong>choose a plugin to add a custom code to WooCommerce and WordPress<\/strong>. This is the simplest solution, which doesn&#8217;t require any code knowledge skills. However, please have in mind, that those <strong>plugins may be the target of attacks on your website<\/strong>.<\/p>\n<p>If you&#8217;re looking for the <strong>safest solution and you don&#8217;t want to be dependent on your theme, choose Must Use Plugins<\/strong>. Adding Must Use Plugins seems complicated, but if you learn this functionality, adding another custom code will be very easy. I can also add that <strong>this is the way recommended by our developers<\/strong>.<\/p>\n<p>If creating Must Use Plugin is a little too much for you, you can <strong>use your child theme functions.php file<\/strong>. It\u2019s also o good solution, but be careful and follow a few rules. Most of all, <strong>remember to add your code to a Child theme<\/strong>.<\/p>\n<h2 id=\"plugin\">Add custom code to WordPress with a plugin<\/h2>\n<p>I don&#8217;t think I&#8217;ll surprise anyone with the fact that you can use a plugin to add custom code to WordPress. There are quite a few of them in the WordPress repository. In this article, I will show you how to use the <a href=\"https:\/\/wordpress.org\/plugins\/code-snippets\/\">Code Snippets<\/a> plugin.<\/p>\n<p><strong>Easy solution\u2026<\/strong><\/p>\n<p>This solution is getting more and more popular. Why is that? First of all, it is the simplest one. In most cases, all you have to do is just install an additional plugin, paste the code and everything is ready. It doesn&#8217;t require any knowledge of the code and paying additional attention.\u00a0 What\u2019s more, all the plugins are free and available in the WordPress repository.<\/p>\n<p>Its simplicity makes it an extremely tempting solution for beginner WordPress users. I get it. <strong>If you are a complete rookie, probably using a plugin to add your custom code is the right move<\/strong>. Unfortunately, this solution has its disadvantages.<\/p>\n<p><strong>\u2026but not safe.<\/strong><\/p>\n<p>Have in mind that it\u2019s not the safest solution. By their specific characteristics, <strong>plugins like Code Snippets may be the target of attacks on your website<\/strong>. If you want to use this option, remember to use regularly updated plugins, and additionally secure your website. However, it will be best if you\u2019ll use one of the other solutions presented in that article.<\/p>\n<p>Enough with all the descriptions and theories. It is time to move on to a proper guide.<\/p>\n<h3>How to add a custom code in WordPress with the Code Snippets plugin?<\/h3>\n<p>To add a new snippet, just go to <strong>Snippets<\/strong> in the WordPress menu and click the <strong>Add New<\/strong> button. You can also use the <strong>Add New<\/strong> link in the WordPress menu directly.<\/p>\n<p><a class=\"glightbox\" href=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/add-new-snippet-in-Code-Snippets-plugin.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-224739 size-full\" src=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/add-new-snippet-in-Code-Snippets-plugin.png\" alt=\"add new snippet in Code Snippets plugin\" width=\"763\" height=\"724\" srcset=\"https:\/\/octolize.com\/app\/uploads\/2020\/12\/add-new-snippet-in-Code-Snippets-plugin.png 763w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/add-new-snippet-in-Code-Snippets-plugin-260x247.png 260w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/add-new-snippet-in-Code-Snippets-plugin-712x676.png 712w\" sizes=\"auto, (max-width: 763px) 100vw, 763px\" \/><\/a><\/p>\n<p>On a new page, you can add your snippet. In this example, I\u2019ll use the custom code from my earlier article on <a href=\"https:\/\/octolize.com\/blog\/united-arab-emirates-woocommerce\/\" target=\"_blank\" rel=\"noopener\">How to add a United Arab Emirates city in WooCommerce<\/a>.<\/p>\n<p>Enter the <strong>Title<\/strong> of your custom code. It should be self-describing so that you will be able to easily determine how it works. You can add a <strong>Description<\/strong> for additional information.<\/p>\n<p><a class=\"glightbox\" href=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/new-custom-code-in-Code-Snippets-plugin.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-224740 size-full\" src=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/new-custom-code-in-Code-Snippets-plugin.png\" alt=\"new custom code in Code Snippets plugin\" width=\"1658\" height=\"993\" srcset=\"https:\/\/octolize.com\/app\/uploads\/2020\/12\/new-custom-code-in-Code-Snippets-plugin.png 1658w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/new-custom-code-in-Code-Snippets-plugin-260x156.png 260w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/new-custom-code-in-Code-Snippets-plugin-712x426.png 712w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/new-custom-code-in-Code-Snippets-plugin-768x460.png 768w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/new-custom-code-in-Code-Snippets-plugin-1536x920.png 1536w\" sizes=\"auto, (max-width: 1658px) 100vw, 1658px\" \/><\/a><\/p>\n<p>You can also add some tags, and priority. If everything is complete, <strong>save changes and activate the snippet<\/strong>.<\/p>\n<p><a class=\"glightbox\" href=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Save-new-custom-code-in-Code-Snippets-plugin.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-224741 size-full\" src=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Save-new-custom-code-in-Code-Snippets-plugin.png\" alt=\"Save new custom code in Code Snippets plugin\" width=\"831\" height=\"280\" srcset=\"https:\/\/octolize.com\/app\/uploads\/2020\/12\/Save-new-custom-code-in-Code-Snippets-plugin.png 831w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Save-new-custom-code-in-Code-Snippets-plugin-260x88.png 260w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Save-new-custom-code-in-Code-Snippets-plugin-712x240.png 712w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Save-new-custom-code-in-Code-Snippets-plugin-768x259.png 768w\" sizes=\"auto, (max-width: 831px) 100vw, 831px\" \/><\/a><\/p>\n<p>You can do it on the same page or in the <strong>All Snippets<\/strong> <strong>list<\/strong>.<\/p>\n<p><a class=\"glightbox\" href=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Activate-new-custom-code-in-Code-Snippets-plugin.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-224742 size-full\" src=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Activate-new-custom-code-in-Code-Snippets-plugin.png\" alt=\"Activate new custom code in Code Snippets plugin\" width=\"1472\" height=\"524\" srcset=\"https:\/\/octolize.com\/app\/uploads\/2020\/12\/Activate-new-custom-code-in-Code-Snippets-plugin.png 1472w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Activate-new-custom-code-in-Code-Snippets-plugin-260x93.png 260w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Activate-new-custom-code-in-Code-Snippets-plugin-712x253.png 712w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Activate-new-custom-code-in-Code-Snippets-plugin-768x273.png 768w\" sizes=\"auto, (max-width: 1472px) 100vw, 1472px\" \/><\/a><\/p>\n<p>If the snippet is correct, your custom code should work well and be active on your website.<\/p>\n<h2 id=\"functions\">Add Custom Code to functions.php in WordPress<\/h2>\n<p>Another popular method to <strong>add WooCommerce custom code<\/strong> is by placing it directly into the <code>functions.php<\/code> file of your child theme. This is especially useful if you\u2019re following tutorials that provide <strong>code snippets for WooCommerce customization<\/strong>. This is certainly the most popular solution for adding custom code in WordPress. In many articles or documentation, you can find information to add a certain code to the functions.php file of your theme. How to do it? It\u2019s not that complicated.<\/p>\n<h3>Remember to use Child Theme<\/h3>\n<p>We strongly recommend adding your<strong> custom code to the Child Theme functions.php file rather than to your original Theme<\/strong>. There are two main reasons to do that. If you add your custom code to the functions.php file of your regular theme, all the changes will be lost with each update of the theme. What&#8217;s more, it&#8217;s much more likely to crash your website by making a mistake in the code or deleting an important element of previously added code.<\/p>\n<div class=\"info-box  \u201dinfo\u201d   \">If you want to learn more about using Child Themes in WordPress, check out the official <a href=\"https:\/\/developer.wordpress.org\/themes\/advanced-topics\/child-themes\/\">Theme Handbook<\/a>.<\/div>\n<p>Remember that adding code to the functions.php file of your theme will make you dependent on it. If you decide to change your theme or debug an error on another theme, the code added earlier won\u2019t work. That\u2019s why this solution is best to add changes to your theme rather than adding changes to the website functionality.<\/p>\n<h3>How to add Custom Code to functions.php in WordPress?<\/h3>\n<h4><strong>Add The Code To Your Theme Functions.php From WordPress Dashboard<\/strong><\/h4>\n<p>Just go to <strong>Appearance &gt; Theme Editor<\/strong>. Make sure that you are editing your <strong>Child Theme<\/strong>, and select <strong>Theme Functions (functions.php)<\/strong>.<\/p>\n<p><a class=\"glightbox\" href=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Child-Theme-functions.php-file.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-224743 size-full\" src=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Child-Theme-functions.php-file.png\" alt=\"Child Theme functions.php file\" width=\"529\" height=\"474\" srcset=\"https:\/\/octolize.com\/app\/uploads\/2020\/12\/Child-Theme-functions.php-file.png 529w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Child-Theme-functions.php-file-260x233.png 260w\" sizes=\"auto, (max-width: 529px) 100vw, 529px\" \/><\/a><\/p>\n<p>There you can paste your custom code.<\/p>\n<p><a class=\"glightbox\" href=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Add-Custom-Code-to-functions.php-in-WordPress.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-224744 size-full\" src=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Add-Custom-Code-to-functions.php-in-WordPress.png\" alt=\"Add Custom Code to functions.php in WordPress\" width=\"1643\" height=\"905\" srcset=\"https:\/\/octolize.com\/app\/uploads\/2020\/12\/Add-Custom-Code-to-functions.php-in-WordPress.png 1643w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Add-Custom-Code-to-functions.php-in-WordPress-260x143.png 260w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Add-Custom-Code-to-functions.php-in-WordPress-712x392.png 712w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Add-Custom-Code-to-functions.php-in-WordPress-768x423.png 768w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Add-Custom-Code-to-functions.php-in-WordPress-1536x846.png 1536w\" sizes=\"auto, (max-width: 1643px) 100vw, 1643px\" \/><\/a><\/p>\n<p>Make sure there\u2019s no closing ?&gt; tag and <strong>Update File<\/strong>.<\/p>\n<h4>Add The Code To Your Theme Functions.php From cPanel or FTP<\/h4>\n<p>To do that, use File Manager of your cPanel or FTP client. In both situations go to <strong>public_html folder &gt; [WordPress Folder] &gt; wp-content &gt; themes &gt; [theme folder] &gt; functions.php<\/strong>.<\/p>\n<p><a class=\"glightbox\" href=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Add-the-Custom-Code-in-Functions.php-from-FTP-client.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-224745 size-full\" src=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Add-the-Custom-Code-in-Functions.php-from-FTP-client.png\" alt=\"Add the Custom Code in Functions.php from FTP client\" width=\"615\" height=\"657\" srcset=\"https:\/\/octolize.com\/app\/uploads\/2020\/12\/Add-the-Custom-Code-in-Functions.php-from-FTP-client.png 615w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Add-the-Custom-Code-in-Functions.php-from-FTP-client-260x278.png 260w\" sizes=\"auto, (max-width: 615px) 100vw, 615px\" \/><\/a><\/p>\n<p>Open and edit that file. Scroll down the way to the end of the file, paste the code and save it. <strong>This method is better than using the WordPress Dashboard<\/strong>. If anything in the code is wrong and it\u2019ll cause any issues on your website, it can easily be reverted.<\/p>\n<h2 id=\"mu-plugin\">Add Custom Code in WooCommerce using Must Use Plugins<\/h2>\n<p><strong>Must Use Plugins, or simply mu-plugins<\/strong>, are plugins installed differently than regular plugins. They are installed in the <em>wp-content\/mu-plugins<\/em> directory. Must Use Plugins don&#8217;t need (and cannot) be activated. They cannot be deactivated either. Plugins are active and work as long as they are in the <em>mu-plugins<\/em> directory.<\/p>\n<p>Must Use Plugins are an ideal way to add additional functionality related to the site, things that should always work, even when you change your theme. It\u2019s also a very secure solution. Adding Custom Code using Must Use Plugins<strong> is recommended by our developers. <\/strong><\/p>\n<h3>How to add Must Use Plugin?<\/h3>\n<p>As you will see, adding Must Use Plugin is not that difficult. First, in the <em>wp-content<\/em> directory\u00a0 create a new <em>mu-plugins<\/em> folder. You can use File Manager of your cPanel or FTP client. In the new directory, create a new file. I added just simply <em>custom_code.php<\/em> file. Open the file for editing and add your custom code. Remember to start with &lt;?php, but don\u2019t add closing ?&gt; tag. Your code should look like this:<\/p>\n<p><code>&lt;?php<\/code><\/p>\n<p><code>\/\/your custom code<\/code><\/p>\n<p>Save the file and Must Use Plugin should be active and working. Basically, you can use the mu-plugins like an old functions.php to add custom code to WooCommerce and WordPress. You can add many or even all of our snippets in one file.<\/p>\n<p>You can find your Must Use Plugins in the WordPress Dashboard. Just go <strong>Plugins &gt; Installed Plugins &gt; Must-Use<\/strong>. It\u2019ll be just the name of the file that you have added.<\/p>\n<p><a class=\"glightbox\" href=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Must-Use-plugin-in-WordPress.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-224746 size-full\" src=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Must-Use-plugin-in-WordPress.png\" alt=\"Must-Use plugin in WordPress\" width=\"979\" height=\"556\" srcset=\"https:\/\/octolize.com\/app\/uploads\/2020\/12\/Must-Use-plugin-in-WordPress.png 979w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Must-Use-plugin-in-WordPress-260x148.png 260w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Must-Use-plugin-in-WordPress-712x404.png 712w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Must-Use-plugin-in-WordPress-768x436.png 768w\" sizes=\"auto, (max-width: 979px) 100vw, 979px\" \/><\/a><\/p>\n<p>If you want to include additional information about the custom code in WordPress, you can add a typical plugin comment at the beginning of the file, with information about the name, author, and version:<\/p>\n<p><code>\/*<\/code><\/p>\n<p><code>Plugin Name: My custom code<\/code><\/p>\n<p><code>Description: Functions extending the capabilities of my website<\/code><\/p>\n<p><code>Version: 1.0<\/code><\/p>\n<p><code>Author: Bartosz Gajewski<\/code><\/p>\n<p><code>*\/<\/code><\/p>\n<p>With that additional comment, your mu-plugin should look like this:<\/p>\n<p><a class=\"glightbox\" href=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Must-Use-plugin-in-WordPress-with-additional-information.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-224747 size-full\" src=\"https:\/\/octolize.com\/cdn-cgi\/image\/format=auto\/app\/uploads\/2020\/12\/Must-Use-plugin-in-WordPress-with-additional-information.png\" alt=\"Must-Use plugin in WordPress with additional information\" width=\"998\" height=\"444\" srcset=\"https:\/\/octolize.com\/app\/uploads\/2020\/12\/Must-Use-plugin-in-WordPress-with-additional-information.png 998w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Must-Use-plugin-in-WordPress-with-additional-information-260x116.png 260w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Must-Use-plugin-in-WordPress-with-additional-information-712x317.png 712w, https:\/\/octolize.com\/app\/uploads\/2020\/12\/Must-Use-plugin-in-WordPress-with-additional-information-768x342.png 768w\" sizes=\"auto, (max-width: 998px) 100vw, 998px\" \/><\/a><\/p>\n<h2>FAQ: Custom Code in WooCommerce &amp; WordPress<\/h2>\n<h3>Is it safe to add custom code to WordPress or WooCommerce?<\/h3>\n<p><span style=\"font-weight: 400\">Yes, but only if done properly. Adding code through safe methods like the <\/span><span style=\"font-weight: 400\">functions.php<\/span><span style=\"font-weight: 400\"> file of a child theme or using a code snippets plugin minimizes the risk of breaking your site. Always test your code on a staging site first and create a backup before making changes.<\/span><\/p>\n<h3>What\u2019s the best way to add custom PHP code to WooCommerce?<\/h3>\n<p><span style=\"font-weight: 400\">The safest and most beginner-friendly method is using a plugin like Code Snippets. It allows you to add, manage, and activate\/deactivate custom code without directly editing theme files.<\/span><\/p>\n<h3>Can I add WooCommerce code directly to my theme\u2019s functions.php file?<\/h3>\n<p><span style=\"font-weight: 400\">Yes, but only if you\u2019re using a <\/span><b>child theme<\/b><span style=\"font-weight: 400\">. Editing the <\/span><span style=\"font-weight: 400\">functions.php<\/span><span style=\"font-weight: 400\"> file of a parent theme is not recommended, as your changes will be overwritten after a theme update. A child theme ensures your code remains safe during updates.<\/span><\/p>\n<h3>Should I use a plugin or a child theme for adding code?<\/h3>\n<p><span style=\"font-weight: 400\">It depends. Use a <\/span><b>child theme<\/b><span style=\"font-weight: 400\"> if you&#8217;re comfortable editing code and need deeper customization. Use a <\/span><b>plugin<\/b><span style=\"font-weight: 400\"> (like Code Snippets) if you want a safer, plugin-based interface to manage snippets. Both methods work, it\u2019s about what suits your workflow best.<\/span><\/p>\n<h3>What types of code can I safely add to WooCommerce or WordPress?<\/h3>\n<p><span style=\"font-weight: 400\">You can add various types of custom PHP code, such as:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">WooCommerce checkout field modifications<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Custom shipping conditions<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Payment method tweaks<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">WordPress filters and actions<\/span><\/li>\n<li style=\"font-weight: 400\"><span style=\"font-weight: 400\">Admin dashboard changes<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400\">Just make sure you understand what the code does and test before applying it to a live site.<\/span><\/p>\n<h3>What if I get a white screen or error after adding code?<\/h3>\n<p><span style=\"font-weight: 400\">That usually means there\u2019s a syntax error in the code. If you can\u2019t access your admin panel, use FTP or a file manager (e.g., in your hosting panel) to remove the faulty snippet or revert changes made in <\/span><span style=\"font-weight: 400\">functions.php<\/span><span style=\"font-weight: 400\">.<\/span><\/p>\n<h3>Can I use custom code instead of installing plugins?<\/h3>\n<p><span style=\"font-weight: 400\">Yes, in many cases, custom code can replace lightweight plugins and help reduce bloat. However, for complex functionality, a well-built plugin may be more secure and better supported than writing it from scratch.<\/span><\/p>\n<h2>Summary<\/h2>\n<p>I hope this guide has helped you understand <strong>how to safely add custom code to WooCommerce and WordPress<\/strong>, whether you prefer using a plugin, editing the functions.php file, or creating Must Use Plugins. The methods described here are designed to make adding WooCommerce code snippets easier, safer, and more efficient. By choosing the right approach, you can customize your store without unnecessary plugins and maintain full control over your site\u2019s functionality.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Learn how to safely add custom code to WooCommerce and WordPress. Explore the best methods for adding snippets and customizing your store.<\/p>","protected":false},"author":5611,"featured_media":224753,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1831,1903],"tags":[],"class_list":["post-224738","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-woocommerce"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.6 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How to Add Custom Code to WooCommerce and WordPress?<\/title>\n<meta name=\"description\" content=\"Discover 3 safe ways to add custom code to WordPress and WooCommerce: via plugin, child theme, or must\u2011use plugin.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/octolize.com\/es\/blog\/add-custom-code-woocommerce-and-wordpress\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Add Custom Code to WooCommerce and WordPress Safely?\" \/>\n<meta property=\"og:description\" content=\"Learn how to safely add custom code to WooCommerce and WordPress. Explore the best methods for adding snippets and customizing your store.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/octolize.com\/es\/blog\/add-custom-code-woocommerce-and-wordpress\/\" \/>\n<meta property=\"og:site_name\" content=\"Octolize\" \/>\n<meta property=\"article:published_time\" content=\"2025-09-22T06:54:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-09-24T18:06:20+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/octolize.com\/app\/uploads\/2020\/12\/How-to-add-custom-code-to-WooCommerce-and-WordPress.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"628\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Bartosz Gajewski\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Bartosz Gajewski\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"12 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/octolize.com\\\/blog\\\/add-custom-code-woocommerce-and-wordpress\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/octolize.com\\\/blog\\\/add-custom-code-woocommerce-and-wordpress\\\/\"},\"author\":{\"name\":\"Bartosz Gajewski\",\"@id\":\"https:\\\/\\\/octolize.com\\\/#\\\/schema\\\/person\\\/1fffc6f40d4bd269e2e1c3538a39d8e0\"},\"headline\":\"How to Add Custom Code to WooCommerce and WordPress Safely?\",\"datePublished\":\"2025-09-22T06:54:21+00:00\",\"dateModified\":\"2025-09-24T18:06:20+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/octolize.com\\\/blog\\\/add-custom-code-woocommerce-and-wordpress\\\/\"},\"wordCount\":2276,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/octolize.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/octolize.com\\\/blog\\\/add-custom-code-woocommerce-and-wordpress\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/octolize.com\\\/app\\\/uploads\\\/2020\\\/12\\\/How-to-add-custom-code-to-WooCommerce-and-WordPress.jpg\",\"articleSection\":[\"Blog\",\"WooCommerce\"],\"inLanguage\":\"es-ES\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/octolize.com\\\/blog\\\/add-custom-code-woocommerce-and-wordpress\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/octolize.com\\\/blog\\\/add-custom-code-woocommerce-and-wordpress\\\/\",\"url\":\"https:\\\/\\\/octolize.com\\\/blog\\\/add-custom-code-woocommerce-and-wordpress\\\/\",\"name\":\"How to Add Custom Code to WooCommerce and WordPress?\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/octolize.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/octolize.com\\\/blog\\\/add-custom-code-woocommerce-and-wordpress\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/octolize.com\\\/blog\\\/add-custom-code-woocommerce-and-wordpress\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/octolize.com\\\/app\\\/uploads\\\/2020\\\/12\\\/How-to-add-custom-code-to-WooCommerce-and-WordPress.jpg\",\"datePublished\":\"2025-09-22T06:54:21+00:00\",\"dateModified\":\"2025-09-24T18:06:20+00:00\",\"description\":\"Discover 3 safe ways to add custom code to WordPress and WooCommerce: via plugin, child theme, or must\u2011use plugin.\",\"inLanguage\":\"es-ES\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/octolize.com\\\/blog\\\/add-custom-code-woocommerce-and-wordpress\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"es-ES\",\"@id\":\"https:\\\/\\\/octolize.com\\\/blog\\\/add-custom-code-woocommerce-and-wordpress\\\/#primaryimage\",\"url\":\"https:\\\/\\\/octolize.com\\\/app\\\/uploads\\\/2020\\\/12\\\/How-to-add-custom-code-to-WooCommerce-and-WordPress.jpg\",\"contentUrl\":\"https:\\\/\\\/octolize.com\\\/app\\\/uploads\\\/2020\\\/12\\\/How-to-add-custom-code-to-WooCommerce-and-WordPress.jpg\",\"width\":1200,\"height\":628,\"caption\":\"How to add custom code to WooCommerce and WordPress\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/octolize.com\\\/blog\\\/add-custom-code-woocommerce-and-wordpress\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/octolize.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"How to Add Custom Code to WooCommerce and WordPress Safely?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/octolize.com\\\/#website\",\"url\":\"https:\\\/\\\/octolize.com\\\/\",\"name\":\"Octolize\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/octolize.com\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/octolize.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"es-ES\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/octolize.com\\\/#organization\",\"name\":\"Octolize\",\"url\":\"https:\\\/\\\/octolize.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"es-ES\",\"@id\":\"https:\\\/\\\/octolize.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/octolize.com\\\/app\\\/uploads\\\/2022\\\/03\\\/octolize-logo-rgb-pion-green-e1649128780788.png\",\"contentUrl\":\"https:\\\/\\\/octolize.com\\\/app\\\/uploads\\\/2022\\\/03\\\/octolize-logo-rgb-pion-green-e1649128780788.png\",\"width\":656,\"height\":628,\"caption\":\"Octolize\"},\"image\":{\"@id\":\"https:\\\/\\\/octolize.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/octolize.com\\\/#\\\/schema\\\/person\\\/1fffc6f40d4bd269e2e1c3538a39d8e0\",\"name\":\"Bartosz Gajewski\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"es-ES\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f4a355a17050796980acd833dc9cbac4ce04daf3cf261c078e27f0dc68a1a20c?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f4a355a17050796980acd833dc9cbac4ce04daf3cf261c078e27f0dc68a1a20c?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f4a355a17050796980acd833dc9cbac4ce04daf3cf261c078e27f0dc68a1a20c?s=96&d=mm&r=g\",\"caption\":\"Bartosz Gajewski\"},\"description\":\"Content Specialist in WP Desk. He tries to increase the number of plugin users with useful content. Privately an enthusiast of mountains and European cinema.\",\"sameAs\":[\"https:\\\/\\\/www.linkedin.com\\\/in\\\/bartoszgajewski\\\/\"],\"jobTitle\":\"Content Writer\",\"url\":\"https:\\\/\\\/octolize.com\\\/es\\\/blog\\\/author\\\/bartosz\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"How to Add Custom Code to WooCommerce and WordPress?","description":"Discover 3 safe ways to add custom code to WordPress and WooCommerce: via plugin, child theme, or must\u2011use plugin.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/octolize.com\/es\/blog\/add-custom-code-woocommerce-and-wordpress\/","og_locale":"es_ES","og_type":"article","og_title":"How to Add Custom Code to WooCommerce and WordPress Safely?","og_description":"Learn how to safely add custom code to WooCommerce and WordPress. Explore the best methods for adding snippets and customizing your store.","og_url":"https:\/\/octolize.com\/es\/blog\/add-custom-code-woocommerce-and-wordpress\/","og_site_name":"Octolize","article_published_time":"2025-09-22T06:54:21+00:00","article_modified_time":"2025-09-24T18:06:20+00:00","og_image":[{"width":1200,"height":628,"url":"https:\/\/octolize.com\/app\/uploads\/2020\/12\/How-to-add-custom-code-to-WooCommerce-and-WordPress.jpg","type":"image\/jpeg"}],"author":"Bartosz Gajewski","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Bartosz Gajewski","Est. reading time":"12 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/octolize.com\/blog\/add-custom-code-woocommerce-and-wordpress\/#article","isPartOf":{"@id":"https:\/\/octolize.com\/blog\/add-custom-code-woocommerce-and-wordpress\/"},"author":{"name":"Bartosz Gajewski","@id":"https:\/\/octolize.com\/#\/schema\/person\/1fffc6f40d4bd269e2e1c3538a39d8e0"},"headline":"How to Add Custom Code to WooCommerce and WordPress Safely?","datePublished":"2025-09-22T06:54:21+00:00","dateModified":"2025-09-24T18:06:20+00:00","mainEntityOfPage":{"@id":"https:\/\/octolize.com\/blog\/add-custom-code-woocommerce-and-wordpress\/"},"wordCount":2276,"commentCount":0,"publisher":{"@id":"https:\/\/octolize.com\/#organization"},"image":{"@id":"https:\/\/octolize.com\/blog\/add-custom-code-woocommerce-and-wordpress\/#primaryimage"},"thumbnailUrl":"https:\/\/octolize.com\/app\/uploads\/2020\/12\/How-to-add-custom-code-to-WooCommerce-and-WordPress.jpg","articleSection":["Blog","WooCommerce"],"inLanguage":"es-ES","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/octolize.com\/blog\/add-custom-code-woocommerce-and-wordpress\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/octolize.com\/blog\/add-custom-code-woocommerce-and-wordpress\/","url":"https:\/\/octolize.com\/blog\/add-custom-code-woocommerce-and-wordpress\/","name":"How to Add Custom Code to WooCommerce and WordPress?","isPartOf":{"@id":"https:\/\/octolize.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/octolize.com\/blog\/add-custom-code-woocommerce-and-wordpress\/#primaryimage"},"image":{"@id":"https:\/\/octolize.com\/blog\/add-custom-code-woocommerce-and-wordpress\/#primaryimage"},"thumbnailUrl":"https:\/\/octolize.com\/app\/uploads\/2020\/12\/How-to-add-custom-code-to-WooCommerce-and-WordPress.jpg","datePublished":"2025-09-22T06:54:21+00:00","dateModified":"2025-09-24T18:06:20+00:00","description":"Discover 3 safe ways to add custom code to WordPress and WooCommerce: via plugin, child theme, or must\u2011use plugin.","inLanguage":"es-ES","potentialAction":[{"@type":"ReadAction","target":["https:\/\/octolize.com\/blog\/add-custom-code-woocommerce-and-wordpress\/"]}]},{"@type":"ImageObject","inLanguage":"es-ES","@id":"https:\/\/octolize.com\/blog\/add-custom-code-woocommerce-and-wordpress\/#primaryimage","url":"https:\/\/octolize.com\/app\/uploads\/2020\/12\/How-to-add-custom-code-to-WooCommerce-and-WordPress.jpg","contentUrl":"https:\/\/octolize.com\/app\/uploads\/2020\/12\/How-to-add-custom-code-to-WooCommerce-and-WordPress.jpg","width":1200,"height":628,"caption":"How to add custom code to WooCommerce and WordPress"},{"@type":"BreadcrumbList","@id":"https:\/\/octolize.com\/blog\/add-custom-code-woocommerce-and-wordpress\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/octolize.com\/"},{"@type":"ListItem","position":2,"name":"How to Add Custom Code to WooCommerce and WordPress Safely?"}]},{"@type":"WebSite","@id":"https:\/\/octolize.com\/#website","url":"https:\/\/octolize.com\/","name":"Octolize","description":"","publisher":{"@id":"https:\/\/octolize.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/octolize.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"es-ES"},{"@type":"Organization","@id":"https:\/\/octolize.com\/#organization","name":"Octolize","url":"https:\/\/octolize.com\/","logo":{"@type":"ImageObject","inLanguage":"es-ES","@id":"https:\/\/octolize.com\/#\/schema\/logo\/image\/","url":"https:\/\/octolize.com\/app\/uploads\/2022\/03\/octolize-logo-rgb-pion-green-e1649128780788.png","contentUrl":"https:\/\/octolize.com\/app\/uploads\/2022\/03\/octolize-logo-rgb-pion-green-e1649128780788.png","width":656,"height":628,"caption":"Octolize"},"image":{"@id":"https:\/\/octolize.com\/#\/schema\/logo\/image\/"}},{"@type":"Person","@id":"https:\/\/octolize.com\/#\/schema\/person\/1fffc6f40d4bd269e2e1c3538a39d8e0","name":"Bartosz Gajewski","image":{"@type":"ImageObject","inLanguage":"es-ES","@id":"https:\/\/secure.gravatar.com\/avatar\/f4a355a17050796980acd833dc9cbac4ce04daf3cf261c078e27f0dc68a1a20c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/f4a355a17050796980acd833dc9cbac4ce04daf3cf261c078e27f0dc68a1a20c?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/f4a355a17050796980acd833dc9cbac4ce04daf3cf261c078e27f0dc68a1a20c?s=96&d=mm&r=g","caption":"Bartosz Gajewski"},"description":"Content Specialist in WP Desk. He tries to increase the number of plugin users with useful content. Privately an enthusiast of mountains and European cinema.","sameAs":["https:\/\/www.linkedin.com\/in\/bartoszgajewski\/"],"jobTitle":"Content Writer","url":"https:\/\/octolize.com\/es\/blog\/author\/bartosz\/"}]}},"_links":{"self":[{"href":"https:\/\/octolize.com\/es\/wp-json\/wp\/v2\/posts\/224738","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/octolize.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/octolize.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/octolize.com\/es\/wp-json\/wp\/v2\/users\/5611"}],"replies":[{"embeddable":true,"href":"https:\/\/octolize.com\/es\/wp-json\/wp\/v2\/comments?post=224738"}],"version-history":[{"count":11,"href":"https:\/\/octolize.com\/es\/wp-json\/wp\/v2\/posts\/224738\/revisions"}],"predecessor-version":[{"id":336021,"href":"https:\/\/octolize.com\/es\/wp-json\/wp\/v2\/posts\/224738\/revisions\/336021"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/octolize.com\/es\/wp-json\/wp\/v2\/media\/224753"}],"wp:attachment":[{"href":"https:\/\/octolize.com\/es\/wp-json\/wp\/v2\/media?parent=224738"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/octolize.com\/es\/wp-json\/wp\/v2\/categories?post=224738"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/octolize.com\/es\/wp-json\/wp\/v2\/tags?post=224738"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}