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To capture lazy-loaded images in a Puppeteer full-page screenshot, scroll through the page to trigger loading, wait for the images or a page-specific readiness signal, then call page.screenshot({ fullPage: true }). The full-page option expands the capture area; it does not itself make the browser request images that have not yet come near the viewport.
Why lazy-loaded images can be missing
Pages commonly defer images with loading="lazy" until they are within a browser-calculated distance of the viewport. Puppeteer can capture the document’s full height, but extending the screenshot area does not necessarily scroll through the document or trigger those deferred requests. The result can be a full-length screenshot with blank image areas.
Puppeteer’s screenshot guide demonstrates navigating with waitUntil: 'networkidle2' before capture, but network idle is only a general navigation signal. It does not prove that offscreen lazy images have been requested or loaded. See the Puppeteer screenshot guide and MDN’s image loading reference.
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This JavaScript pattern scrolls down by roughly one viewport at a time, pauses briefly at each position to let the browser progress, returns to the top, waits for DOM image elements to finish, and saves a full-page PNG. It is an adaptable implementation pattern, not a guarantee for every site: adjust its readiness condition for the page you are capturing.
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const url = 'https://example.com';
await page.goto(url, { waitUntil: 'networkidle2' });
await page.evaluate(async () => {
const step = Math.max(1, window.innerHeight);
for (let y = 0; y < document.documentElement.scrollHeight; y += step) {
window.scrollTo(0, y);
await new Promise(resolve => setTimeout(resolve, 250));
}
window.scrollTo(0, 0);
});
await page.waitForFunction(() =>
[...document.images].every(img => img.complete)
);
await page.screenshot({ path: 'page.png', fullPage: true });The loop brings content near the viewport so native lazy loading can begin. The pause is a small opportunity for rendering and requests to progress; it is not evidence that any particular image has loaded. The final check waits for each image element’s complete property. As MDN notes, that property can also be true when an image failed, so for images that must contain usable pixels, check naturalWidth > 0 as well and decide how your capture should handle failures. Reference: MDN’s HTMLImageElement.complete documentation.
Use a page-specific readiness condition when possible
If the site exposes a loaded marker or you know which image matters, wait for that condition rather than treating every image in the document as equally important. Puppeteer’s page.waitForFunction() can wait for a condition evaluated in the page; page.evaluate() can run asynchronous page-context code. For example, to require a particular image to have loaded successfully:
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await page.waitForFunction(() => {
const img = document.querySelector('.hero-image');
return img && img.complete && img.naturalWidth > 0;
});Replace .hero-image with a selector that identifies the image on your target page. For pages where images appear or move as content loads, consider checking readiness after each scroll step or waiting for a page-specific marker before the final capture. Puppeteer API references: page.evaluate() and page.waitForFunction().
Choose full-page or element capture
- Whole document: Use
page.screenshot({ fullPage: true })when the output should cover the full page. Scroll and establish readiness first; the option controls screenshot extent, not lazy-image loading. - One component: If you only need a known element, Puppeteer’s
ElementHandle.screenshot()scrolls the element into view when needed and captures it. That behavior does not guarantee that every image inside the element has finished rendering. See the ElementHandle screenshot API.
Handle pages that do not use ordinary image lazy loading
The generic scroll-and-wait approach is not universal. A page may use JavaScript or an intersection observer rather than native loading="lazy", place content in a nested scroll container, append images after your readiness check, or use background images instead of DOM <img> elements. Virtualized lists may remove offscreen items as you scroll, so a full-page capture may not contain all content even after visiting each section.
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When images remain missing, inspect the page’s actual DOM and scrolling behavior. Scroll the relevant container—not just window—and wait for the site’s own content signal or the specific resources that must appear. For pages you control, setting image width and height can improve layout stability, particularly for lazy images. See MDN’s guidance on image loading.
Troubleshooting
| Symptom | Likely cause | What to change |
|---|---|---|
| Images near the bottom are blank | The screenshot expanded to full height, but scrolling did not trigger their requests. | Scroll through the document before capture, then wait for the relevant images or a page-specific signal. |
networkidle2 finishes, but images are still absent |
Network idle is not a guarantee that offscreen lazy resources have been requested. | Trigger loading by scrolling and add an explicit readiness check for the images needed in the output. |
| The image check passes, but an image is broken | img.complete can be true after a failed load. |
For expected usable images, also check img.naturalWidth > 0; handle failures according to your capture requirements. |
| Scrolling the window has no effect | The page may scroll inside a nested container, or a site-specific script may control loading. | Identify and scroll the actual container, then wait for the relevant content to appear. |
| Some content disappears or is missing in a long capture | A virtualized list may render only items near the current scroll position, or new content may be added after the check. | Use a site-specific method to expose the required content and verify it is present at capture time; the generic loop cannot guarantee a complete virtualized page. |
| Images are CSS backgrounds rather than image elements | document.images does not cover CSS background images. |
Wait on a page-specific condition or inspect the relevant element’s background and rendering state. |
Performance and reliability considerations
Scrolling and waiting adds time, especially on tall pages. A fixed pause at every viewport is simple but may be longer than needed on some pages and too short on others. A targeted selector or application-ready signal can avoid waiting on unrelated content. If the page shifts or appends items asynchronously, readiness should be checked after those changes rather than only once immediately after the scroll loop.
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Do not treat one signal as proof of every other condition: networkidle2 does not establish lazy-image readiness, and complete does not establish successful image retrieval. When correctness matters, check the images or application state that the screenshot must show.
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Frequently Asked Questions
Why does `fullPage: true` not load every lazy image?
It expands the screenshot’s capture area; it does not necessarily scroll the page to trigger offscreen image requests.
Does `img.complete` mean the image loaded successfully?
No. For images expected to have usable pixels, also check `naturalWidth > 0`.
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