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Effortless QR Code Generator is a WordPress plugin that allows you to create QR codes using a simple shortcode. It supports both client-side JavaScript rendering and server-side PHP rendering.
<h4>Features</h4>
<ul>
<li>Simple shortcode: Use <code>[effortless_qrcode url="https://example.com"]</code> to generate QR codes</li>
<li>Dual rendering modes: Client-side (JavaScript) or server-side (PHP/PNG)</li>
<li>Developer API: Generate QR codes programmatically from your plugins/themes</li>
<li>Customizable size: Control QR code dimensions (100-500 pixels)</li>
<li>Custom colors: Set dark and light colors for the QR code</li>
<li>Error correction levels: Choose L, M, Q, or H</li>
<li>Cached PNG images: Server-rendered QR codes are cached in the uploads folder</li>
<li>Responsive design: QR codes adapt to different screen sizes</li>
<li>No external dependencies: All code is bundled locally</li>
<li>Privacy-friendly: No data sent to external services</li>
<li>Accessibility ready: Proper alt text support</li>
<li>Performance optimized: Scripts load only when needed</li>
</ul>
<h4>Shortcode Parameters</h4>
<ul>
<li><code>url</code> – The URL to encode (required)</li>
<li><code>size</code> – Size in pixels (default: 150, min: 100, max: 500)</li>
<li><code>color_dark</code> – Dark color in hex format (default: #000000)</li>
<li><code>color_light</code> – Light color in hex format (default: #ffffff)</li>
<li><code>render</code> – Rendering mode: “client” or “server” (default: client)</li>
<li><code>ecc</code> – Error correction level: L, M, Q, H (default: M)</li>
<li><code>alt</code> – Alt text for accessibility (server rendering only)</li>
<li><code>class</code> – Additional CSS class (server rendering only)</li>
<li><code>data</code> – Arbitrary data to encode (plain text, WiFi, vCard, etc.). When set, overrides <code>url</code> and disables <code>link</code></li>
<li><code>link</code> – Wrap QR code in a clickable link: “yes” or “no” (default: no). Only works with URL content, ignored when <code>data</code> is used</li>
<li><code>title</code> – Tooltip text shown on hover</li>
<li><code>target</code> – Link target attribute: “_blank”, “_self”, etc. (default: _blank)</li>
</ul>
<h4>Usage Examples</h4>
Basic usage (client-side): 
 [effortless_qrcode url=”https://example.com”]
Server-side rendering: 
 [effortless_qrcode url=”https://example.com” render=”server”]
With custom size and colors: 
 [effortless_qrcode url=”https://example.com” size=”200″ color_dark=”#0073aa”]
Server-side with high error correction: 
 [effortless_qrcode url=”https://example.com” render=”server” ecc=”H” alt=”Scan me”]
<h4>PHP API for Developers</h4>
Third-party plugins and themes can generate QR codes programmatically using the <code>Effortless_QRCode_Native</code> class.
Basic Usage:
<pre><code><?php
// Make sure the plugin is active
if ( class_exists( 'Effortless_QRCode_Native' ) ) {

 // Generate a QR code PNG
 $result = Effortless_QRCode_Native::generate_png( 'https://example.com' );

 if ( $result ) {
 echo '<img src="' . esc_url( $result['url'] ) . '" alt="QR Code">';
 }
}
?>
</code></pre>
With Custom Options:
<pre><code><?php
$result = Effortless_QRCode_Native::generate_png(
 'https://example.com', // Data to encode (required)
 200, // Size in pixels (default: 150)
 '#0073aa', // Dark color (default: #000000)
 '#ffffff', // Light color (default: #ffffff)
 'H', // ECC level: L, M, Q, H (default: M)
 4 // Margin in modules (default: 4)
);

if ( $result ) {
 // $result['url'] - Public URL to the PNG image
 // $result['path'] - Server filesystem path to the PNG file
 // $result['debug'] - Debug information string
}
?>
</code></pre>
Display in a Template:
<pre><code><?php
if ( class_exists( 'Effortless_QRCode_Native' ) ) {
 $result = Effortless_QRCode_Native::generate_png( get_permalink() );

 if ( $result ) : ?>
 <div class="my-qr-code">
 <img src="<?php echo esc_url( $result['url'] ); ?>"
 alt="<?php esc_attr_e( 'Scan to visit this page', 'my-theme' ); ?>"
 width="150"
 height="150">
 </div>
 <?php endif;
}
?>
</code></pre>
<h4>API Reference</h4>
Effortless_QRCode_Native::generate_png( $data, $size, $color_dark, $color_light, $ecc, $margin )
Generates a QR code PNG image and saves it to the WordPress uploads folder.
Parameters:
<ul>
<li><code>$data</code> (string) – Required. The data to encode (URL, text, etc.)</li>
<li><code>$size</code> (int) – Optional. Image size in pixels. Default: 150</li>
<li><code>$color_dark</code> (string) – Optional. Hex color for dark modules. Default: ‘#000000’</li>
<li><code>$color_light</code> (string) – Optional. Hex color for light modules. Default: ‘#ffffff’</li>
<li><code>$ecc</code> (string) – Optional. Error correction level (L, M, Q, H). Default: ‘M’</li>
<li><code>$margin</code> (int) – Optional. Quiet zone margin in modules. Default: 4</li>
</ul>
Returns:
Array on success with keys: 
* <code>url</code> – Public URL to the generated PNG image 
* <code>path</code> – Server filesystem path to the PNG file 
* <code>debug</code> – Debug information string
Returns <code>false</code> on failure.
Notes:
<ul>
<li>Images are cached based on all parameters (same input = same file)</li>
<li>Files are stored in <code>wp-content/uploads/effortless-qrcodes/</code></li>
<li>Requires GD library for PNG generation</li>
</ul>
<h4>Error Correction Levels</h4>
<ul>
<li>L – 7% recovery capacity (smallest QR code)</li>
<li>M – 15% recovery capacity (default, good balance)</li>
<li>Q – 25% recovery capacity</li>
<li>H – 30% recovery capacity (largest QR code, best for print)</li>
</ul>
Higher error correction allows the QR code to be read even if partially damaged or obscured.
<h4>Privacy</h4>
This plugin does not collect, store, or transmit any personal data. QR codes are generated locally (either in the browser or on your server).
<h4>Requirements</h4>
<ul>
<li>PHP 7.4+ with GD library (for server-side PNG generation)</li>
<li>WordPress 5.0+</li>
<li>JavaScript enabled (for client-side rendering only)</li>
</ul>

EffortLess QR Code Generator

Generate QR codes easily with a simple shortcode. Supports client-side (JavaScript) and server-side (PHP/PNG) rendering with a developer API.

QRtool

QR-Code widget and shortcode in one QR-Code generator plugin. Use the QR-Code widget in your sidebars or generate QR-Codes in pages and articles by inserting [qr-code] right where you want your QR-Code to be displayed.
The QR Code widget is equipped with configurations for alignment, color (foreground and background), size, margin, error correction of QR-Code and more to suit the needs of your installment.
The shortcode [qr-code] can be extendet with attributes to achieve the same level of customization as with the widget. 
Example: 
[qr-code align=”left” class=”my-qr-code” color=”#000000″ background_color=”#FFFFFF” size=”4″ margin=”4″ level=”M” post_id=”0″]

WPQR QR-Code Generator

QR-Code widget and shortcode in one QR-Code generator plugin. Use the QR-Code widget in your sidebars or generate QR-Codes in pages and articles.

EffortLess QR Code Generator vs WPQR QR-Code Generator