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A website hero image is the prominent visual near the top of a page, usually spanning the viewport width and paired with a headline, short supporting copy and one primary action. The most reliable implementation treats the artwork as responsive wallpaper: compose it with room for HTML text, serve an appropriately sized format, reserve its dimensions, and art-direct the mobile crop instead of shrinking the desktop file everywhere.
What a hero image is—and what it must do
A hero establishes the mood of a page and helps visitors understand the offer quickly. The National Science Foundation describes hero components as full-width areas containing a large image at the top of a page, with space for a headline, supporting text and a link or button.
That definition separates a hero from an ordinary content image. A product detail photo explains a feature; a hero creates context and directs the first decision. The image should support the message, not compete with it.
Three useful hero patterns
- Atmospheric wide photograph: A landscape or product-in-context scene places the subject to one side and leaves negative space for the headline. This “wallpaper” composition tolerates responsive cropping better than a busy portrait.
- Art-directed campaign image: Desktop and mobile use different crops or even different artwork. The mobile version keeps the focal point clear and avoids placing it beneath navigation or the call-to-action.
- Product or service hero: A clear image of the product in use sits beside a concise value statement and one primary CTA. Keep the offer text in HTML rather than inside the bitmap.
Choose dimensions and composition before exporting
For a full-width hero, start with a wide, high-resolution source. NSF recommends at least a 1.7:1 width-to-height ratio and gives 1920×1080 (16:9) as a preferred full-size example. That is a starting canvas, not a promise that every device will display the entire frame.
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Build a safe area
Place the visual subject away from edges that may be cropped. Reserve relatively quiet space for the heading, supporting copy and CTA. Check the composition at desktop, tablet and narrow-phone aspect ratios; a focal point that is safe at 16:9 can disappear when a container becomes tall and narrow.
- Keep faces, products and logos out of likely crop zones.
- Leave enough contrast behind the text area for a readable overlay.
- Do not bake the headline, price or button into the image.
- Prepare a version without text so content can be translated, resized and indexed.
Informative versus decorative artwork
An informative image communicates something visitors need to understand. Give it concise, contextual alternative text. A texture or illustration that adds atmosphere but no information is decorative; use the appropriate empty alternative so assistive technology does not announce redundant content. W3C WAI notes that alternatives support screen readers, Braille displays, speech input, mobile users and search engines.
Responsive hero images: picture, srcset and sizes
Responsive delivery has two separate jobs. Resolution switching serves the same composition at an appropriate pixel density; art direction changes the composition when the crop itself must change.
Use srcset and sizes for one composition
When the subject remains in the same place, provide width variants and tell the browser how wide the image will render:
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<img
src="/images/hero-1280.webp"
srcset="/images/hero-640.webp 640w,
/images/hero-1280.webp 1280w,
/images/hero-1920.webp 1920w"
sizes="100vw"
width="1920"
height="1080"
alt="A team reviewing a dashboard beside a laptop">The fallback src remains useful for older or unusual clients. Adjust sizes if the hero occupies only part of the layout—for example, (min-width: 900px) 50vw, 100vw for a two-column design.
Use picture for art direction
If mobile needs a tighter crop, use <picture> with a media-specific source:
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<picture>
<source media="(max-width: 767px)"
srcset="/images/hero-mobile.avif 768w,
/images/hero-mobile-2x.avif 1536w"
sizes="100vw"
type="image/avif">
<source media="(max-width: 767px)"
srcset="/images/hero-mobile.webp 768w"
sizes="100vw"
type="image/webp">
<img src="/images/hero-desktop.jpg"
width="1920" height="1080"
alt="A team reviewing a dashboard beside a laptop"
fetchpriority="high">
</picture>The browser chooses the first matching source. Keep the focal subject visible in the mobile artwork rather than relying on CSS to rescue a fundamentally wrong crop.
Formats, loading and layout stability
Offer modern formats with a fallback
AVIF and WebP can reduce transfer size; retain a broadly supported JPEG or PNG fallback. Use the format sources shown above and verify that transparency, color and fine detail survive conversion.
Reserve space with dimensions
Always provide width and height, or reserve an equivalent aspect ratio in CSS. The browser can then allocate space before the image arrives, reducing cumulative layout shift and preventing text and buttons from jumping.
Do not lazy-load the above-the-fold hero
The hero is commonly the largest contentful paint (LCP) image. Chrome guidance recommends normal eager loading for an important above-the-fold image and supports fetchpriority="high" when it is the LCP candidate. Reserve loading="lazy" for images below the fold; lazy-loading the first visual can delay the page’s primary content.
.hero {
aspect-ratio: 16 / 9;
min-height: 360px;
overflow: hidden;
position: relative;
}
.hero img {
width: 100%;
height: 100%;
object-fit: cover;
object-position: 65% center;
}
@media (max-width: 767px) {
.hero { aspect-ratio: 4 / 5; }
.hero img { object-position: 50% center; }
}Use CSS cropping only when one composition works at every breakpoint. Otherwise switch to an art-directed source.
Keep text readable and accessible
Put words in HTML
Text embedded in a bitmap can pixelate, crop or become unreadable as the image resizes. It also cannot be selected, translated or reliably announced by assistive technology. Place the heading, supporting copy and CTA in a semantic HTML layer:
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<section class="hero" aria-labelledby="hero-title">
<img src="/images/hero.webp" width="1920" height="1080"
alt="A designer presenting a new mobile interface">
<div class="hero__content">
<h1 id="hero-title">Design reviews without the busywork</h1>
<p>Share one clear workflow with every stakeholder.</p>
<a class="button" href="/demo">See the demo</a>
</div>
</section>Check contrast at every breakpoint
Contrast changes when a crop exposes a lighter or busier region behind the copy. Test the actual desktop and mobile renderings, not just the source file. A restrained gradient or solid panel behind the text can preserve readability without obscuring the subject.
Ensure the CTA remains keyboard reachable, has a visible focus style and is not covered by decorative layers. Do not make the entire hero a clickable image when a clearly labeled link communicates the action better.
Account for motion and reduced-motion preferences
If the hero uses video, parallax or animated transitions, provide a still fallback and respect the user’s reduced-motion preference. A static image should still convey the page’s essential context when motion is disabled or unavailable.
Implementation checklist
- Define the message, one primary CTA and the focal subject.
- Compose a wide source with a 1.7:1-or-wider canvas and a text-safe area.
- Export AVIF or WebP plus a JPEG/PNG fallback.
- Create mobile art direction when the focal point or crop changes.
- Add
srcset,sizesand explicit dimensions. - Keep the above-the-fold image eager; consider
fetchpriority="high". - Write concise alt text for informative images; use an empty alternative for decorative ones.
- Verify contrast, keyboard focus, crop safety and CTA visibility on real phones.
- Measure network performance on a slower mobile connection before launch.
Common problems and fixes
The subject is cut off on phones
Cause: A desktop composition is being cover-cropped into a narrow container. Fix: supply a mobile crop with <picture>, or change object-position only if the same artwork remains intelligible.
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Cause: missing intrinsic dimensions or a reserved ratio. Fix: add matching width/height attributes or an explicit aspect-ratio.
The first paint is slow
Cause: an oversized file, an uncompressed format or lazy-loading on the LCP image. Fix: generate width variants, serve AVIF/WebP, set accurate sizes, remove loading="lazy" above the fold and consider high fetch priority.
Text disappears into the photograph
Cause: contrast was checked only at one viewport. Fix: test each crop and add a gradient or content panel; keep the copy in HTML.
Alt text repeats the heading
Cause: the image description and visible copy were written independently. Fix: describe the image’s useful visual context, or use an empty alternative when it is purely decorative and the surrounding text already conveys the message.
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FAQ
Can a hero be a background image?
Yes, but an actual <img> is usually easier to make responsive, accessible and measurable as the LCP image. Use CSS backgrounds for decorative layers or when the design genuinely needs background behavior.
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Should every hero span the entire viewport height?
No. Full-width is common; full-height is a design choice. Preserve enough of the next section to signal that more content exists, especially on mobile.
How many CTAs belong in a hero?
One primary action is clearest. Add a secondary link only when it serves a distinct audience or decision and does not compete visually with the main CTA.
Frequently Asked Questions
Can a hero be a background image?
Yes, but an actual <img> is usually easier to make responsive, accessible and measurable as the LCP image. Use CSS backgrounds for decorative layers or when the design genuinely needs background behavior.
Should every hero span the entire viewport height?
No. Full-width is common; full-height is a design choice. Preserve enough of the next section to signal that more content exists, especially on mobile.
How many CTAs belong in a hero?
One primary action is clearest. Add a secondary link only when it serves a distinct audience or decision and does not compete visually with the main CTA.
Quick Recap
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