yehudaT

Adds a button to the WC edit/new product page that enables generating a SKU (catalog number) in a pre-defined format and length. It is aimed for Woocommerce shop admins who manage a shop with no pre-defined catalog numbers for products.
When adding or editing a product it is common that you do not have a pre-set catalog number for the product. 
This plugin enables you to generate a SKU (catalog number) for the product, with specified format and length. 
It also checks that the suggested SKU does not exist in the database for any other product.
At the same time you can use it to check a SKU number you enter.
Starting on V 1.0.1 you can choose to add automatic SKU for every new product or existing product without a SKU (no need to click a button or select).
You also can select not to generate a random SKU, but write it yourself, and the plugin will check asynchronously if the SKU already exist in the database.
<blockquote>
Tested up to Woocommerce Version 6.0.0
Important! version 1.0.2 and up works with Woocommerce 2.6.0 and up. If you have earlier version of WC please use this plugin version 1.0.1
</blockquote>
<h4>Features</h4>
<ol>
<li>None intrusive. The plugin adds the SKU to the SKU field in the product edit page but it saved only by you. </li>
<li>Option to add auto prefix to the generated SKU.</li>
<li>Option to auto fill SKU for new product.</li>
<li>3 flexible SKU formats – between min-max numbers, string (you can select any alpha numeric combination), Incremental (auto increment next SKU)</li>
</ol>

SKU generator for Woocommerce by ATR

Generates custom SKUs for WooCommerce products automatically or on-demand, with flexible formatting options and duplicate checking.

kungwoopanda

Kung Woo Auto Sku for WooCommerce is a lightweight and efficient tool designed to save you time by automatically managing your product SKUs.
Whenever you create or save a product (or product variation), the plugin checks if the SKU field is empty. If it is, the plugin automatically generates a unique SKU based on the product ID. You can fully customize the generated SKUs with custom prefixes and leading zeros.
<h3>Main Features</h3>
<ul>
<li>Automatic SKU Generation: Automatically assigns the Product ID (or Variation ID) as the SKU upon saving.</li>
<li>Bulk Generation: A powerful AJAX-based bulk tool to generate SKUs for all existing products and variations in your store with a single click. Safe for large stores!</li>
<li>Custom Prefix: Add any string before the ID (e.g., <code>SKU-1234</code>).</li>
<li>Leading Zeros: Define a minimum length for your SKUs. The plugin will automatically pad the ID with leading zeros (e.g., ID <code>12</code> becomes <code>SKU-0012</code>).</li>
<li>Read-Only Protection: Lock the SKU field on the WooCommerce product edit screen to prevent accidental manual edits of auto-generated SKUs.</li>
<li>Overwrite Mode (New!): Force the plugin to overwrite existing custom SKUs with your new, standardized auto-generated format during bulk generation or product saving.</li>
</ul>
This plugin is designed with performance in mind and strictly follows WordPress and WooCommerce coding standards.

Kung Woo Auto Sku for WooCommerce

Automatically generates and fills empty SKU fields with the product or variation ID. Includes bulk generation, leading zeros, and overwrite options.

SKU generator for Woocommerce by ATR vs Kung Woo Auto Sku for WooCommerce