For a full-width website hero, 16:9 is a practical starting point—not a universal rule. The right aspect ratio is the ratio of the space your design actually displays, especially on mobile. Choose the image and crop for that container, then check that the important subject remains visible at every intended screen size.
Start with the shape of the displayed header
An image file’s aspect ratio is its width divided by its height. A 1920 × 1080 image is 16:9; a 1200 × 400 image is 3:1. But the source file does not determine the final appearance by itself. The displayed container may have a different ratio, and the browser or your CSS may crop the image to fill it.
For example, a wide source image placed in a short banner can lose much of its top and bottom. A landscape image placed in a tall mobile hero may lose its sides. The key decision is therefore not simply “Which ratio is best?” but “What shape will this component have at each viewport, and can the image tolerate the resulting crop?”
A useful starting point: 16:9 for a full-width hero
The U.S. National Science Foundation’s current author guidance, accessed in 2026, identifies 1920 × 1080 pixels (16:9) as its preferred full-size hero asset for high quality on large monitors. It also lists 1366 × 768 pixels (16:9) as an option with less detail, and says a hero image is principally a wide format, with at least 1.7:1. These are NSF recommendations for its own content, not a web-wide standard.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchUse 16:9 as a sensible first draft if your hero is a broad landscape image and your layout does not prescribe another shape. Then compare the source ratio with the actual desktop and mobile containers. A component specification from your own design system should take precedence over a general starting point.
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Choose how the image fits its container
For a fixed-shape hero, CSS fit behavior determines whether the image fills the box or stays fully visible. The choice is a trade-off between filling the layout and retaining every edge of the source.
| Setting | What it does | Best suited to | Trade-off |
|---|---|---|---|
object-fit: cover |
Fills the image box, cropping parts of the source when its ratio differs from the box. | Photographic heroes where a full-bleed image matters more than showing every edge. | Some content will be cut off; the crop can change as the box changes shape. |
object-fit: contain |
Shows the complete image within the box without cropping it. | Images, diagrams, or artwork where every part must remain visible. | The image may not fill the box, leaving empty space around it. |
With cover, use object-position to move the visible crop toward the focal point. The default center position may be fine for a centered subject, but it can cut off a face, product, or other important detail placed near an edge.
Example: a deliberately cropped hero
This pattern fills a wide hero while preserving the image’s intrinsic proportions and allowing you to adjust the focal point:
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.hero__image {
display: block;
width: 100%;
height: 28rem;
object-fit: cover;
object-position: 65% center;
}
@media (max-width: 40rem) {
.hero__image {
height: 20rem;
object-position: 72% center;
}
}The heights and focal positions above are examples, not prescribed values. Adjust them for your layout and subject. A fixed height creates a predictable crop; an automatic height preserves the image’s natural proportions instead. Check both approaches in the real design before choosing.
Check the crop on narrow screens
A desktop crop that looks balanced can fail on a phone. When a full-width image is squeezed into a narrow container, its sides may disappear. A tall header can also consume a large share of the mobile viewport before the reader reaches the page content. MDN’s responsive-image guidance describes these issues and supports testing the actual subject and composition at narrow widths.
Inspect the image at the smallest screen width your design intends to support, not just at a desktop size and one convenient phone preset. Check whether the subject stays visible, whether the crop leaves room for the headline and controls, and whether the header’s height pushes useful content too far down.
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When one image cannot serve both layouts
If no crop keeps the important content in frame at both wide and narrow sizes, provide a separate mobile composition. Responsive image markup can let the browser select an appropriate file for the layout:
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<picture>
<source
media="(max-width: 40rem)"
srcset="/images/hero-mobile.webp">
<img
src="/images/hero-desktop.webp"
alt="A concise description of the meaningful image content"
width="1920"
height="1080"
class="hero__image">
</picture>Use a distinct mobile source when the composition genuinely needs to change—for instance, when the subject must move to one side to leave space for text. Do not stretch an image to force it into a different ratio; stretching distorts its contents. Responsive sources can also deliver files suited to different screen sizes, rather than making every device download the same oversized asset.
Set image dimensions and keep text accessible
Where applicable, include the image’s intrinsic width and height attributes or reserve space with a deliberate layout ratio. That gives the browser information about the image’s shape before it loads and helps prevent surrounding content from shifting as the image appears. The dimensions describe the source; CSS can still scale or crop it for the container.
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Keep essential headings, calls to action, and other text in the page’s HTML rather than baking them into the image. NSF’s author guidance recommends a separate accessible headline layer. Text embedded in a picture can be cropped or obscured at different sizes and is not a substitute for accessible page text.
A practical selection and testing process
- Check the component rules. If your site or design system defines a hero image ratio or dimensions, begin there. Treat other organizations’ component specifications as examples, not universal requirements.
- Measure the rendered box. Note the image container’s approximate width and height on desktop and narrow screens. Compare those shapes with the source image’s ratio.
- Mark the important content. Identify the subject, faces, product details, or other elements that must remain visible. Allow for the crop around them, including any space required by overlaid HTML text.
- Choose the fit behavior. Use
coverwhen filling the box is the priority and cropping is acceptable. Usecontainwhen the entire image must remain visible and surrounding space is acceptable. - Preview the smallest layout. Check the focal subject, text placement, and header height at the narrowest intended width. Adjust
object-position, change the container shape, or use a mobile-specific composition if needed. - Reserve the layout space. Provide intrinsic dimensions or a defined ratio so the page has room for the image while it loads.
- Use an appropriately sized source. Provide enough detail for the largest rendered display, and use responsive sources when screens need different sizes or compositions.
Preview the responsive header in a browser
In your own development setup, load the page at desktop and mobile viewport widths, then inspect the rendered image and crop. If you need a repeatable screenshot for review, use your browser’s capture tools or an automated browser workflow. Check each viewport separately: one desktop screenshot cannot establish whether a narrow crop preserves the focal point.
For a useful review, capture the page after its layout and image have loaded, at the viewport sizes that matter to your site. Compare the visible crop, the position of the subject, the balance between image and text, and how much content the header pushes below the fold. A screenshot is a visual check, not proof that every device or browser will render identically.
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ScreenshotNeo is a website screenshot API and MCP server. One GET request can return an image or PDF, which can help you inspect a header at a chosen URL and viewport. For example, this cURL request captures a page as WebP; replace the URL with your page and supply your API key. See the ScreenshotNeo documentation for the available parameters.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp- It accepts cookie or consent banners as a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each step can be turned off.
- Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed. Response headers report the page verdict and billing status.
- Its MCP server provides the tools
take_screenshot,get_page_info, andcapture_pdffor AI agents and MCP clients. - The free plan includes 1,000 screenshots a month without a card; paid plans start at $5 for 3,000 screenshots.
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Common problems and fixes
- The subject is cut off. With
cover, cropping is expected when the box and source ratios differ. Adjustobject-position, change the box shape, or supply a composition made for that viewport. - The whole image appears, but blank bands remain. That is consistent with
containwhen the image does not match the container’s ratio. Decide whether preserving all content or filling the hero matters more. - The image looks distorted. Check that the layout is scaling it proportionally rather than forcing both dimensions independently. Use a crop or a different source instead of stretching it.
- The mobile header takes up too much room. Revisit the mobile container height and composition. A shorter container or mobile-specific source may preserve the subject while showing more page content.
- Content jumps when the image loads. Supply intrinsic width and height attributes where applicable, or reserve the intended space with a layout ratio.
- Text in the artwork vanishes on some screens. Move essential copy into an HTML text layer. It can then remain readable and positioned independently of the image crop.
How to decide: a compact checklist
- Use a site or component specification if one exists; otherwise treat 16:9 as a starting point for a full-width landscape hero, not a mandate.
- Choose the ratio based on the displayed container at desktop and mobile sizes.
- Use
coverfor a filled crop orcontainwhen every edge must remain visible. - Keep the focal subject safe from cropping, and switch to a mobile composition if one source cannot work across layouts.
- Reserve image space, deliver a suitably detailed source, and keep essential text outside the image pixels.
Frequently Asked Questions
Does a website header have to use 16:9?
No. It is a practical starting point for some full-width hero images, but the displayed container and the site’s component rules determine the appropriate shape.
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Use a fit that keeps the entire image visible, such as object-fit: contain, and accept that the image may not fill the box. Alternatively, design the container around the asset’s natural proportions.
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