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There is no universal “hero image size.” Choose dimensions from the hero slot your design actually renders, then provide responsive candidates for that slot and the device’s pixel density. Use srcset and an accurate sizes value so the browser can select an efficient file, use picture when mobile needs a different crop, and declare the image’s intrinsic dimensions so space is reserved before loading.
This approach produces sharper heroes on large screens without sending desktop-sized files to phones. It also matters for performance: a hero image is often the page’s Largest Contentful Paint (LCP) element.
What size should a web hero image be?
Start with the rendered CSS dimensions, not a preset such as “1920×1080.” Measure the hero container at each important breakpoint. If it renders at 1,200 CSS pixels wide, supply a candidate near 1,200 pixels for standard-density displays and a larger candidate for high-density screens. Do the same for the height and crop.
For example, if a desktop hero is 1,200 × 600 CSS pixels (a 2:1 ratio), useful source candidates might be 800 × 400, 1,200 × 600 and 2,400 × 1,200. Those are delivery options, not rules. Your actual set should reflect the slots, content and file sizes on your site.
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Measure the real slot
- Open the page at each supported breakpoint.
- Use browser developer tools to inspect the hero image or its container.
- Record the rendered width and height in CSS pixels, including changes caused by navigation, text wrapping and overlays.
- Check whether the image is full-bleed, constrained by a max-width, or displayed inside a grid column.
A full-width hero commonly needs more width variants than a thumbnail because the difference between a phone, tablet and wide desktop is substantial. The image guidance from Google Chrome Developers recommends serving an image at the correct size rather than relying on one oversized file.
Account for device pixel density
A device with a 2× pixel ratio can benefit from roughly twice the source dimensions in each direction, subject to bandwidth and visual detail. You do not need a candidate for every possible density. A small, well-spaced set lets the browser choose without creating dozens of nearly identical files.
| Rendered slot (CSS pixels) | Illustrative candidates | Why |
|---|---|---|
| 360 × 240 mobile | 360 × 240, 720 × 480 | Covers standard and high-density phones. |
| 768 × 420 tablet | 768 × 420, 1,536 × 840 | Provides a sharper 2× option when it is worth the bytes. |
| 1,200 × 600 desktop | 800 × 400, 1,200 × 600, 2,400 × 1,200 | Allows an intermediate choice and a high-density option. |
The table is an example planning grid, not a universal specification. Keep each candidate’s crop and aspect ratio consistent unless you deliberately art-direct it.
Choose the hero’s aspect ratio and crop
The correct ratio is the ratio of the visible design area. A wide marketing banner, a split hero with text beside the image and a tall mobile panel are different compositions. Decide where the subject may be cropped before exporting variants.
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If the same composition works at every width, export the candidates at one ratio and let CSS scale them. Accurate ratio information prevents unexpected stretching and reduces layout movement.
Use art direction for a different mobile crop
If a desktop image puts the subject at the right edge but mobile needs the subject centered, use a separate source selected with <picture>. Do not force a desktop crop into a narrow slot when it makes the subject unreadable.
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<picture>
<source
media="(max-width: 700px)"
srcset="/images/hero-mobile-480.webp 480w,
/images/hero-mobile-720.webp 720w"
sizes="100vw">
<img
src="/images/hero-desktop-1200.webp"
srcset="/images/hero-desktop-800.webp 800w,
/images/hero-desktop-1200.webp 1200w,
/images/hero-desktop-2400.webp 2400w"
sizes="(max-width: 1200px) 100vw, 1200px"
width="1200"
height="600"
alt="People collaborating around a table"
fetchpriority="high">
</picture>Give each art-directed source its own correct dimensions. If the mobile files use a different ratio, the mobile source and its layout must reserve that mobile ratio rather than inheriting the desktop one.
Use srcset and sizes correctly
With width descriptors such as 800w and 1200w, srcset lists the files available. sizes describes the image’s expected rendered width; it does not resize the image and does not replace CSS.
<img
src="/images/hero-1200.webp"
srcset="/images/hero-480.webp 480w,
/images/hero-800.webp 800w,
/images/hero-1200.webp 1200w,
/images/hero-2000.webp 2000w"
sizes="(max-width: 640px) 100vw,
(max-width: 1100px) 90vw,
1200px"
width="1200"
height="600"
alt="Product dashboard on a laptop"
fetchpriority="high">Here, a viewport up to 640 pixels is expected to display the image at the viewport width; between 641 and 1,100 pixels it is expected to use 90% of the viewport; above that, the slot is capped at 1,200 pixels. Match these values to your CSS. An inaccurate sizes value can make the browser download a file that is too large or too small.
Do not confuse width descriptors with density descriptors
Use width descriptors when the rendered width changes fluidly. Density descriptors such as 1x and 2x are suitable when the CSS width is fixed. Do not mix the two approaches in one candidate list.
Reserve layout space before the image loads
Set intrinsic width and height attributes on the img, or define an equivalent explicit aspect ratio in CSS. The browser can then calculate the box before the bytes arrive, reducing layout movement.
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.hero-media {
aspect-ratio: 2 / 1;
overflow: hidden;
}
.hero-media img {
display: block;
width: 100%;
height: 100%;
object-fit: cover;
}Only use object-fit: cover when cropping is intentional. If every pixel must remain visible, use contain or preserve the image’s natural ratio instead.
Balance image bytes, format and loading priority
Responsive sizing is also a data-transfer decision. The web.dev guidance “Serve responsive images” reports that serving desktop-sized images to mobile devices can use 2–4× more data than supplying appropriately sized responsive images. That is a general comparison, not a guaranteed saving for every page.
- Export each candidate at the dimensions it will actually need.
- Compress until text, faces and edges remain acceptable at the intended display size.
- Offer modern formats where your delivery pipeline supports them, while retaining a fallback for browsers that need one.
- Do not lazy-load the hero if it is visible at initial load. Give the main image normal or high priority and lazy-load below-the-fold imagery instead.
- Preload only when measurement shows the hero is discovered too late; unnecessary preloads compete with CSS and fonts.
An image CDN can automate resizing and format negotiation, but responsive markup does not inherently require a paid service. Use a CDN when its transformations, caching or operational benefits solve a real need.
A complete implementation pattern
The following example combines art direction, responsive candidates, reserved space and a visible hero layout.
<section class="hero">
<div class="hero-copy">
<h1>Plan projects with less friction</h1>
<p>A short value proposition sits beside the image.</p>
</div>
<div class="hero-media">
<picture>
<source media="(max-width: 700px)"
srcset="/img/hero-mobile-480.avif 480w,
/img/hero-mobile-720.avif 720w"
sizes="100vw">
<img src="/img/hero-desktop-1200.avif"
srcset="/img/hero-desktop-800.avif 800w,
/img/hero-desktop-1200.avif 1200w,
/img/hero-desktop-2000.avif 2000w"
sizes="(max-width: 1100px) 90vw, 1200px"
width="1200" height="675"
alt="Project cards arranged on a planning board"
fetchpriority="high">
</picture>
</div>
</section>.hero {
display: grid;
grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
gap: 2rem;
align-items: center;
}
.hero-media { aspect-ratio: 1200 / 675; }
.hero-media img { width: 100%; height: 100%; object-fit: cover; }
@media (max-width: 700px) {
.hero { grid-template-columns: 1fr; }
.hero-media { aspect-ratio: 3 / 2; }
}Because the mobile source has a 3:2 composition while the desktop source is 1200:675, the mobile rule explicitly reserves the mobile shape. Update the attributes and CSS whenever the exported ratios change.
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How to validate a hero image choice
- Check every breakpoint in responsive developer tools.
- Verify that the selected file is close to the rendered CSS width multiplied by the device pixel ratio.
- Inspect the network panel for an oversized desktop file on mobile.
- Throttle the connection and watch for layout movement before the image arrives.
- Confirm that the subject remains visible after
object-fitcropping. - Measure LCP with your performance tooling; the hero should not be delayed by avoidable JavaScript or a late-discovered background image.
Troubleshooting common problems
The hero looks blurry on high-density screens
Add a larger candidate and ensure the browser is allowed to select it. Check that sizes is not claiming a narrower slot than the CSS actually creates.
Mobile downloads the desktop image
Use width-based srcset candidates, provide a truthful mobile sizes value, and use a media-specific source when the crop differs.
The page jumps when the hero appears
Add accurate width and height attributes or an explicit aspect-ratio. Check that responsive CSS does not later replace the reserved ratio with a conflicting one.
The crop hides the important subject
Reposition the source artwork, use object-position, or create an art-directed crop. Do not solve a composition problem by continually increasing image dimensions.
The hero delays LCP
Keep the critical image in the initial HTML, avoid lazy-loading it when it is visible, reduce its candidate bytes, and remove render-blocking work that postpones discovery.
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Or skip the browser setup
To inspect how a hero actually renders at different viewports, you can capture the page with ScreenshotNeo. Its API accepts a URL and returns a PNG, JPEG, WebP or PDF; clean shots are billed only when the page succeeds, while bot checks, blank pages, timeouts, failed loads and cache hits cost nothing. Cookie banners, newsletter popups and chat widgets are removed before capture.
One call is enough:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o hero-check.webpSee the complete options in the ScreenshotNeo documentation. You can set a viewport or device preset, retina scale, full-page capture, a CSS selector for one element, custom CSS or JavaScript, click an element, wait for a selector or network idle, hide selectors, block resources, provide cookies and headers, choose timezone or geolocation, and create PDFs. An MCP server also lets Claude, Cursor and other MCP clients call take_screenshot, get_page_info and capture_pdf.
Python:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://example.com"}, timeout=90)
open("hero-check.webp", "wb").write(r.content)Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://example.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);The free plan includes 1,000 screenshots per month with no card. Paid plans start at $5 for 3,000 shots, and every feature is included on every plan. Create a free ScreenshotNeo account.
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What is the best hero image size for desktop?
Use the desktop hero slot’s measured CSS width and height, then provide candidates around that width and a higher-density option. There is no universal desktop preset.
Should a hero image be above the fold?
If it is visible on initial load, treat it as a critical image: reserve its space, avoid lazy-loading it, and keep its selected file appropriately sized.
Do I need an image CDN for responsive heroes?
No. Correctly prepared files with srcset, sizes and, when needed, picture work without a paid CDN. A CDN is optional when automated transformations or delivery operations justify it.
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