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Choose a hero crop by checking the actual desktop and mobile slots—not by relying on a universal image size or an automated “saliency” score. Keep the subject and campaign meaning visible, clear of headlines and buttons. If one composition cannot do that at both ratios, create separate art-directed crops and serve them responsively.
Start with the storefront’s real image slots
Before choosing a focal point, find the rendered hero dimensions or aspect ratios at the desktop and mobile breakpoints. Record where headlines and calls to action appear, whether text overlays the image or sits beside it, and which parts of the image are essential: a person’s face, a product, or another element that carries the campaign’s meaning.
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Decide what may be cropped away and what must remain. The theme’s layout and overlays determine the crop; sample dimensions from another site are not a universal standard.
| Source and context | Desktop or full-width example | Mobile or alternative example |
|---|---|---|
| Shopify hero-image guidance (2026) | 1600 × 500 px desktop example | 800 × 1200 px mobile example |
| U.S. National Science Foundation hero component guidance | 1920 × 1080 px component specification | 1366 × 768 px lower-detail alternative at the same ratio |
These figures describe the cited examples and component, not a shared storefront rule. The NSF says its hero images can change substantially across window sizes and may obscure content.
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Choose a focal point that survives the crop
Mark the visual element that communicates the page’s message, then inspect it inside each rendered slot. A focal point that looks well placed on the original canvas may be cut off or covered after the image is cropped and text is overlaid. Check the composition at the actual mobile and desktop ratios, including the headline and CTA positions.
The NSF warns, “The Hero component will crop your image unpredictably at different sizes.” Its guidance advises against a left-aligned focal point in its own component because the headline or page title may overlay that area; it suggests a centered focal point or one less than one quarter right-aligned. That positioning advice is specific to the NSF component, not a universal coordinate. Shopify’s mobile checklist likewise advises keeping critical content away from image edges and centering the focal point.
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Ask whether the image still conveys the same idea when its edges disappear or its center is enlarged. If the message depends on the full frame, use a layout or image treatment that keeps the whole composition visible rather than assuming a focal point can rescue it.
Decide whether one composition is enough
Use a single composition if it preserves the subject and campaign meaning at both target ratios. If mobile needs a tighter, taller, or differently positioned frame, make a separate mobile crop. That is art direction: changing the composition for a viewport, rather than merely supplying a different resolution of the same image.
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For this case, Shopify’s developer guidance recommends the HTML <picture> element. The browser evaluates its source media conditions and selects the matching crop before downloading it. Avoid putting two large <img> elements on the page and hiding one with CSS: display: none does not prevent its image resource from downloading.
Serve the right crop and resolution
Use art-directed sources when the framing or subject position must change; use srcset and sizes to offer appropriate resolutions for each composition. Set sizes to match the rendered layout and breakpoints. Shopify uses sizes="100vw" as an example for a full-width hero, but a narrower or constrained slot needs a value that reflects its actual width. Missing or inaccurate sizes information can lead the browser to download an oversized resource.
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For each art-directed source, provide its own width and height so the browser can reserve space using that crop’s aspect ratio. When there is no separate mobile crop, a single responsive image can serve as a fallback. If the hero is above the fold and likely to be the Largest Contentful Paint element, Shopify’s implementation example uses eager loading and high fetch priority on the fallback <img>; fetchpriority="high" belongs on that element and applies to the selected source. This is a loading choice, not a crop-selection rule.
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Keep overlays legible and accessible
- Keep meaningful headlines and CTA labels in HTML instead of baking them into the image. The NSF says image text, except when purely decorative, creates accessibility problems and can be cropped or obscured.
- Check that text does not cover the face, product, or other focal subject, and that the text remains readable against the image.
- Shopify’s 2026 article cites WCAG contrast thresholds of 4.5:1 for body text and 3:1 for large display text. These are contrast checks, separate from the crop decision.
- Confirm that overlaid buttons and other controls remain operable by keyboard.
Validate the responsive result in the browser
- Open the storefront in Chrome DevTools and use device mode to check the mobile and desktop breakpoints where the hero changes.
- At each size, confirm that the intended crop is selected, the focal subject remains visible, the image still communicates the campaign, and overlays do not collide with the subject.
- In the Network panel, inspect the hero image requests. Verify that the browser downloads the matching crop rather than both desktop and mobile assets, and check the request priority if loading behavior matters.
- Check that the reserved space matches each source’s dimensions and aspect ratio. Use Lighthouse as an additional check on image sizing and loading behavior.
- Review the final composition at the rendered slot size—not just on the uncropped source canvas.
Shopify recommends testing and refining hero images, but the cited guidance does not establish that a particular focal position or saliency method improves conversion. Treat automated focal suggestions as candidates for human review, not as objective proof that a crop preserves the intended message.
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Compare crop candidates against the same criteria
When reviewing two or more versions, assess each against the same practical checks. This is a decision aid, not a standardized scoring system:
Quick Recap
- Is the focal subject visible at both actual slot ratios?
- Does the crop preserve the campaign’s meaning?
- Does the subject remain separate from headline and CTA overlays?
- Is there enough negative space for readable text?
- Does the cropped file retain enough resolution for its displayed size?
- Does responsive delivery select the right asset without downloading an unused crop or causing a layout shift?
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