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Lazy Load Code Generator

Generate image markup that loads late and never shifts layout.

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Drop an image here, or click to choose one

JPEG, PNG, WebP, GIF or SVG · processed on your device, never uploaded

Quick Tool Overview

The Lazy Load Code Generator writes image markup with the attributes that actually move the score: explicit dimensions to stop layout shift, async decoding, and the right loading and priority values. It asks whether the image is above the fold, because lazy loading a hero makes Largest Contentful Paint worse.

What it does
Generates performance-correct image markup
You give it
An image and where it sits on the page
You get back
An img tag with the right attributes
Best for
Core Web Vitals and layout stability
Image Tools Free, unlimited use No sign-up Runs in your browser

About the Lazy Load Code Generator

Modern lazy loading is one attribute, but the attributes around it are what actually decide whether a page scores well: explicit width and height to reserve the space, decoding to keep the main thread free, and fetchpriority for the image that is the LCP.

The mistake almost everyone makes is lazy-loading the hero image, which delays the very thing the Largest Contentful Paint measures. This tool asks whether the image is above the fold and generates the opposite markup if it is — eager loading with high fetch priority and a preload hint. Dimensions are read from the file, so the aspect-ratio box is always correct and nothing shifts.

Key features of the Lazy Load Code Generator

Knows when not to lazy load

Above-the-fold images get eager loading and high fetch priority, which is the opposite of what most guides say.

Dimensions read from the file

Width and height are written in automatically, which is what reserves the space and prevents layout shift.

Placeholder option

A dominant-colour background or blurred LQIP while the real file loads.

Explains each attribute

loading, decoding and fetchpriority each get a sentence, so the markup is understood rather than pasted.

Preload hint included

For the LCP image, the link rel=preload tag is generated alongside.

How to use the Lazy Load Code Generator

  1. 1

    Add the image

    Its real dimensions are read and written into the markup.

  2. 2

    Say where it appears

    Above the fold gets eager loading and high priority; below gets lazy.

  3. 3

    Add a placeholder if you want

    A dominant-colour background or a blurred LQIP while it loads.

  4. 4

    Copy the markup

    Complete with the attributes that stop layout shifting.

Frequently asked questions

No. Never lazy load anything visible without scrolling, especially the hero — that delays the Largest Contentful Paint and makes the score worse rather than better.

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