jwhist

DocRenders lets your visitors download a clean, print-ready PDF of any post or page with a single click. Connect your <a href="https://docrenders.com" rel="nofollow ugc">DocRenders</a> API key, place the button with a shortcode or Gutenberg block, and you’re done.
Features
<ul>
<li>One-click PDF download for posts, pages, or any custom post type</li>
<li>Shortcode <code>[docrenders_pdf]</code> — drop it anywhere in your content</li>
<li>Gutenberg block — insert the PDF button from the block inserter</li>
<li>Configurable button label and placement</li>
<li>Usage meter in the settings page so you always know where you stand</li>
<li>Free plan includes a small “PDF generated by DocRenders” footer; upgrade to remove it</li>
</ul>
WooCommerce (optional)
When WooCommerce is active, a separate settings section appears that lets you automatically attach a PDF invoice to the customer-completed-order email.
How it works
DocRenders sends your post HTML to the DocRenders rendering service and streams the resulting PDF directly to the visitor’s browser — no files are stored on your server.
A free API key is available at <a href="https://docrenders.com" rel="nofollow ugc">docrenders.com</a>.
<h3>External services</h3>
This plugin connects to the DocRenders API to generate PDFs. No PDF files are stored on your server — they are streamed directly to the visitor’s browser.
Endpoints used:
<ul>
<li><code>/render</code> — called whenever a visitor clicks the PDF download button or a WooCommerce invoice is generated. Sends the post/page HTML (or invoice data) and your API key.</li>
<li><code>/usage</code> — called periodically from the admin settings page to display your monthly render count. Sends only your API key.</li>
</ul>
Data sent: post or page HTML content, invoice field values (shop name, address, order details), API key (as a Bearer token), and optional rendering options (page format, margins).
This service is provided by DocRenders. 
 Terms of Service: https://docrenders.com/terms 
 Privacy Policy: https://docrenders.com/privacy

DocRenders – PDF Download Button

Add a "Download PDF" button to any post or page — powered by the DocRenders API.

Yagnik Sangani

This WooCommerce extension simplifies invoice generation for your WooCommerce orders. It enables administrators to effortlessly download PDF invoices directly from the order admin page, while customers can conveniently access and download their order PDFs from the “My Account” page.
<h4>Key Features</h4>
<ul>
<li>Instant PDF Download: Obtain PDF invoices with just one click.</li>
<li>Admin Page Accessibility: Easily download PDF invoices directly from the order admin page.</li>
<li>Customer Convenience: Access and download invoices conveniently from the “My Account” page.</li>
</ul>
<h4>Hooks</h4>
<ul>
<li>Utilized hooks to incorporate new order items into the PDF, 
add_action( ‘wcopd_order_pdf_add_extra_order_details’, ‘callback_function’, 10, 1 );</li>
</ul>

Download PDF Invoices for WooCommerce Orders

By using this plugin it's very easy to download the order invoice.

Nice Plugin

Effortlessly generate and download PDF invoices for your WooCommerce orders.

DocRenders – PDF Download Button vs Download PDF Invoices for WooCommerce Orders