Get Placeholder image url in Magento 2.

Native Magento 2 has four types of placeholder images called, small_image, image, thumbnail, and swatch_image.

Placeholder image URL is used when you want to display default images for a site.
Magento 2 gets a placeholder image URL using below simple code snippet.

I hope you are aware of, How to upload Placeholder images in Magento 2?

Create a Block file to programmatically get a placeholder image,

namespace Rbj\Training\Model;

use Magento\Catalog\Helper\ImageFactory;
use Magento\Framework\View\Asset\Repository;

class Placeholder
    private Repository $assetRepos;
    private ImageFactory $imageFactory;

    public function __construct(
        Repository $assetRepos,
        ImageFactory $imageFactory,
    ) {
        $this->assetRepos = $assetRepos;
        $this->imageFactory = $imageFactory;

     * Get place holder image of a product for small_image
     * @return string
    public function getPlaceHolderImage(): string
        $imagePlaceholder = $this->imageFactory->create();
        $smallImagePlaceHolder = $imagePlaceholder->getPlaceholder('small_image');

        return $this->assetRepos->getUrl($smallImagePlaceHolder);

Call the Placeholder function below way,

$placeholderUrl = $this->getPlaceHolderImage();
<img src="<?php echo $placeholderUrl; ?>" alt="placeholder" />

Using the above way, You can get a small_image Placeholder image URL in Magento 2.

You can pass small_image, image, thumbnail, and swatch_image for a placeholder.