Lazy Load Generator for Images and Iframes
Lazy load generator that produces native loading="lazy" markup for images and iframes. Drop-in HTML you can paste into any template.
<img src="https://example.com/photo.jpg" alt="Description of image" width="1200" height="800" loading="lazy" decoding="async" />
Tip: never lazy-load your hero / above-the-fold image — it delays LCP. Apply loading="lazy" only to images and iframes below the fold.
How to use the Lazy Load Code Generator
- 1Paste the URL of an image, iframe, or video.
- 2Set width, height, and alt text.
- 3Pick native lazy-loading or IntersectionObserver.
- 4Copy the generated snippet into your HTML.
What you can do with the Lazy Load Code Generator
Lazy load an image.
Generate <img loading="lazy"> with width/height to avoid layout shift.
Lazy load an iframe (YouTube, Maps).
Use loading="lazy" or a facade pattern to defer the heavy embed.
Lazy load with IntersectionObserver.
Falls back gracefully for older browsers or finer control over thresholds.
Lazy load background images.
Generate the CSS + JS to load a hero background only when in view.
Lazy Load Code Generator FAQs
Does lazy loading hurt SEO?+
No — Google fully supports loading="lazy" and IntersectionObserver as long as content is reachable. Don't lazy-load the LCP image, though, or you'll slow first paint.
Which images should I NOT lazy load?+
Anything above the fold, especially your LCP image. Lazy-loading the hero adds latency to your Largest Contentful Paint.
Is native lazy loading enough?+
For most sites, yes. Use IntersectionObserver only when you need custom thresholds, placeholders, or background images.
Do I need width and height attributes?+
Yes. Without them the browser can't reserve space and you'll get Cumulative Layout Shift (CLS).
Does this work on WordPress?+
Yes. Paste the snippet into a custom HTML block, or use your theme's templates.
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