Image Lazy-Load Generator

Generate lightweight image placeholders and lazy-loading implementation code.

Chia sẻ:

Drag & Drop Image here

or click to upload

Generator Settings

Placeholder Style

Blur Amount

Preview

Size: 0kb

Generated Code

HTML Code

CSS

.lazy { opacity: 0; transition: opacity 0.3s; }
    .lazy.loaded { opacity: 1; }

JavaScript

document.addEventListener("DOMContentLoaded", function() {
      const lazyImages = document.querySelectorAll("img.lazy");
      const observer = new IntersectionObserver((entries, observer) => {
        entries.forEach(entry => {
          if (entry.isIntersecting) {
            const img = entry.target;
            img.src = img.dataset.src;
            img.onload = () => img.classList.add("loaded");
            observer.unobserve(img);
          }
        });
      });
      lazyImages.forEach(img => observer.observe(img));
    });

Why Use This Tool?

Expert Utilities for Full-Stack Performance Optimization

Boost your website speed significantly.

Automated LQIP Generator

Instantly creates ultra-low resolution, base64-encoded versions of your images to serve as instant, zero-latency placeholders.

Intersection Observer Logic

Generates lean, modern vanilla JavaScript that uses the browser's native API to trigger image loading only when needed, minimizing CPU usage.

Aspect Ratio Preservation

Calculates and includes intrinsic aspect ratio box code to prevent 'Cumulative Layout Shift' (CLS) and ensure a stable, professional page load.

Custom Blur Intensity

Control the aesthetic of your placeholders. Choose from a subtle blur to a heavy, artistic wash to match your site's design language.

Modern & Legacy Fallbacks

Includes standardized 'loading=lazy' attributes along with custom JS-driven observers and 'noscript' tags for maximum cross-browser compatibility.

Zero-Upload Local Logic

All image processing and string encoding happens right in your browser. No data is stored or logged on our servers, ensuring total asset privacy.

Master the Load: How to Implement Lazy Loading

Generate optimized code in steps.

Upload the High-Res Asset

Refresh your site. You should see the blurred placeholder appear instantly and then smoothly fade into the full image as you scroll.

Configure Placeholder Style

Drop the original image you want to optimize into the tool. It should be the final, web-ready version of the file.

Generate the Code Block

Choose your preferred 'Blur' level. A higher blur creates a softer, more abstract placeholder that works well for large hero images.

Integrate into Your Page

The tool will instantly generate three sections: HTML for the image tag, CSS for the fade effect, and JS for the scroll detection.

Verify Data-Src Paths

Replace your standard `<img>` tags with our generated HTML. Add the provided CSS to your stylesheet and the JS to your footer.

Lazy Loading Knowledge Base: Lazy-Loading Optimization FAQ

What is the benefit of using Base64 for placeholders?

Base64 allows the tiny placeholder to be loaded inside the HTML itself, meaning zero extra network requests and an 'instant' appear time.

Will lazy loading hurt my SEO?

No. In fact, it helps! Google's crawler is now very good at reading lazy-loaded images, and the performance boost will improve your Rank.

Does this tool work with WordPress?

Yes. You can use our code in 'Custom HTML' blocks or code-snippet plugins to manually optimize high-traffic landing pages.

What is the difference between this and 'loading=lazy'?

Native 'loading=lazy' is simple but provides no placeholder. Our tool adds the LQIP and fade-in effect for a much more professional feel.

Does the code require any libraries like jQuery?

No. Our generated code is 100% vanilla JavaScript, making it lightweight and future-proof with zero external dependencies.

Is this tool free for developers?

Yes! Our generator is 100% free for both personal and commercial projects, from small blogs to enterprise apps.

How do I know the placeholder is small enough?

We target a maximum size of 1KB per placeholder. Most are actually around 500 bytes, which is less than a few sentences of text.

Is responsive code generation mobile-ready?

Yes. Intersection Observer is supported by Safari, Chrome, and Firefox on all modern mobile devices (iOS and Android).

Is this generator suitable for CSS background-image properties?

This version is specifically for `<img>` tags. For background images, the principles are similar but the implementation code is different.

How do I keep my source images private?

Since our tool processes everything locally in your browser via JS, your full-resolution source data never leaves your computer.