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There is no single pixel size that works for every website header. For a full-width hero, start with a 16:9 image such as 1920 × 1080 px; for a shorter website banner, 1200 × 400 px (3:1) is a useful starting point. Your theme, section height, and responsive crop determine what visitors actually see, so use platform guidance first and preview the finished header on desktop and mobile.
Recommended website header image sizes
Choose dimensions by identifying the component you are designing, not by treating every image across the top of a site as the same kind of “header.” A narrow banner and a large, screen-filling hero need different shapes. These are source-image starting points, not guaranteed display dimensions.
| Use | Starting dimensions | Aspect ratio | What the guidance means |
|---|---|---|---|
| Full-width hero | 1920 × 1080 px | 16:9 | The U.S. National Science Foundation (NSF) recommends this as its preferred full-size hero for high quality on large monitors. |
| Desktop hero in Shopify’s guide | 1280 × 720 px | 16:9 | Shopify’s 2026 image-size guide lists this as a desktop hero size; it also lists a different mobile rendition. |
| Website banner | 1200 × 400 px | 3:1 | Shopify lists this for a banner, a shorter shape than a full hero. |
| Desktop hero in Squarespace guidance | 1600 × 500 px or 1920 × 1080 px | Varies | Squarespace gives both as starting points and emphasizes responsive display. |
| Mobile hero example in Squarespace guidance | 800 × 1200 px | 2:3 | A portrait composition can suit a phone screen; whether you can supply a separate mobile image depends on your site setup. |
The figures differ because the sources describe different components and setups—not because one universal ratio has been overlooked. Start with your theme or platform’s documented dimensions if it provides them. If it does not, use the closest starting point above, then check the actual rendered page at the sizes your visitors use.
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First decide whether you need a banner or a hero
Choose a banner for a shallow horizontal strip
A banner has a wide, short composition, so 1200 × 400 px (3:1) is a reasonable starting point when the design is a strip rather than a large visual area. Keep the important part of the image within the area that remains visible after the site applies its crop. A banner specification should not be substituted for a hero specification simply because both images appear near the top of a page.
Choose a hero for a large visual area
A hero occupies more height and may fill a substantial part of the first screen. A 16:9 source such as 1920 × 1080 px is one well-supported starting point for a full-size hero; Shopify’s guide also gives 1280 × 720 px for a desktop hero. A site may display the source at different dimensions or crop it to fit its layout, so the upload size does not dictate the precise size visitors will see.
Use platform dimensions when available
Guidance from NSF, Shopify, and Squarespace illustrates why “recommended header size” has no one-size-fits-all answer. NSF’s 1920 × 1080 px recommendation is for a full-size hero; Shopify distinguishes its 1280 × 720 px hero from its 1200 × 400 px banner; Squarespace provides more than one desktop starting point and describes responsive resizing. Treat each number in the context it was given, and check your own theme’s settings before preparing the final image.
How aspect ratio affects the crop
Aspect ratio describes the relationship between an image’s width and height. A 16:9 image is wider than a 2:3 portrait image, and a 3:1 banner is much shallower than either. If a layout’s visible area has a different ratio from the source, the site may crop the image to fill it. That can cut off a face, product, logo, or other important subject even when the original file has ample pixels.
Responsive pages can use a different crop on a phone than on a desktop. Shopify’s developer documentation notes that the mobile crop may have a different aspect ratio from the desktop crop. It also warns that omitting dimensions on a responsive source can cause the browser to reserve the wrong ratio while the mobile image loads. A separate mobile composition can protect the subject when your theme supports one; it is not an option in every setup.
Keep important content inside a safe area
- Place the main subject away from the extreme edges, where a responsive crop is more likely to remove it.
- Leave room around faces, products, or other details that must remain visible as the viewport narrows.
- Do not assume text positioned over the desktop image will stay clear of the subject or controls on mobile.
- Check the crop in the actual theme or page builder; the source-image ratio alone cannot tell you exactly what its focal-point and fit settings will do.
Make and test desktop and mobile versions
The most reliable way to choose a final image is to judge it in the page component where it will appear. A source that looks well composed in an image editor may be cropped, resized, or placed behind navigation when the theme renders it.
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- Find the component settings. In your site platform or theme editor, locate the page section or header that will display the image. Check for documented dimensions, a focal-point control, image-fit behavior, and any separate desktop and mobile image fields.
- Prepare a source for the largest intended display. Use the platform’s specified dimensions if provided. Otherwise, select a suitable starting ratio from the table: 16:9 for a large hero or 3:1 for a short banner. Keep a copy of the original so you can make an alternate crop without degrading it through repeated exports.
- Upload and set the crop. If the platform offers a focal point or a fit option, adjust it so the most important part of the image remains in frame. Do not assume that “cover,” automatic resizing, or a default crop will preserve the composition you intended.
- Preview the actual responsive page. Check a representative desktop width and a narrow phone width. Confirm that the subject, headline, navigation, and call to action remain visible and do not collide. If your theme allows a separate mobile image, test that rendition as well.
- Inspect after publishing. Check the live page, not only the editor preview. Confirm that the image has loaded, that the crop matches the preview, and that text remains readable at the widths you tested.
To inspect a live page, open it in a browser, use its responsive or device-preview controls if available, and resize the viewport. Browser tools can help you see how the page behaves, but your site’s own preview and published theme remain the authority for its crop settings.
Or skip the browser setup
For a screenshot of a page you can access, ScreenshotNeo offers a one-request way to capture a rendered result and inspect the composition at a chosen viewport. See the ScreenshotNeo documentation for the available parameters.
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Image quality, file size, and formats
Use enough source resolution for the largest intended display, but do not assume that making the image larger always improves the page. Compress the file and check the real page load as well as visual quality. Shopify’s 2026 general image-size guide says smaller files—often around 500 KB and up to 2 MB in many cases—are better. This is editorial guidance, not a universal limit. Squarespace’s hero article gives a 10–20 MB starting range. Since the recommendations differ substantially, neither should be presented as the right file size for every site. Keep the image as light as practical while preserving acceptable detail, then test your page.
WebP is described in Shopify’s guide as a popular format for web images, and its hero article favors WebP for many hero images. If you choose AVIF, Shopify advises having a fallback because browser support is not universal. The best choice depends on your image, platform support, and whether a fallback is configured. Check that the published page actually serves the format you intended.
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Accessibility and text over a header
A decorative background image usually should not be announced as meaningful content to someone using a screen reader. If an image conveys information that visitors need, provide appropriate alternative text. Shopify’s image-sizing guide explains that alt text helps screen-reader software interpret images.
A headline or call to action is usually better as live page text than baked into the image. Live text is easier to resize and access, and it can remain legible when the image is cropped or displayed on a smaller screen. Check contrast and readability against every part of the image that may appear behind the text. Keep essential words and controls visible on both desktop and mobile layouts.
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Common header image problems and fixes
The subject disappears on mobile
Likely cause: The mobile layout crops the desktop source to a different aspect ratio or focal position. Fix: Move the focal point inward, choose a composition with more space around the subject, or provide a separate mobile crop if your theme allows it. Verify the result on the narrow live layout.
The banner looks too tall or the hero too shallow
Likely cause: You chose a source based on the wrong component, or the section height and image ratio do not match. Fix: Confirm whether the page uses a short banner or a large hero, then start with the corresponding ratio and inspect the theme’s section-height and fit controls.
The uploaded image looks soft
Likely cause: The source does not have enough resolution for the displayed area, or compression is too aggressive. Fix: Prepare a source appropriate for the largest intended display, export it with acceptable quality, and check the published result rather than judging only the editor thumbnail.
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The page shifts while a responsive image loads
Likely cause: The browser has not been given the right dimensions or ratio to reserve space for the responsive source. Shopify’s developer documentation specifically warns about omitting dimensions when the mobile crop uses a different ratio. Fix: Follow the platform’s responsive image guidance and ensure the displayed source has the appropriate dimensions or aspect ratio reserved.
The headline becomes hard to read
Likely cause: The image crop places a busy or bright area behind the text, or text was embedded in an image and scaled down. Fix: Use live text, adjust the image focal point or overlay treatment, and preview the result across viewport widths.
Quick decision checklist
- Short strip across the page? Start with a banner-shaped source such as 1200 × 400 px (3:1), subject to your platform’s guidance.
- Large hero area? Consider a 16:9 source such as 1920 × 1080 px or the platform’s specified hero size.
- Mobile composition at risk? Check the crop, protect the subject, and use a separate mobile image only if the site supports it.
- Image unnecessarily heavy? Compress it while preserving visible quality and test the actual page load.
- Text or important meaning in the image? Prefer live text for headlines and calls to action; supply appropriate alt text when the image itself conveys information.
Frequently Asked Questions
What is the aspect ratio of a 1200 × 400 website banner?
It is 3:1: the image is three times as wide as it is tall.
Can I use the same header image on desktop and mobile?
You can if the composition still works after the mobile crop. Whether your platform lets you assign a separate mobile image depends on your site setup.
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Usually not for a headline or call to action. Live text is easier to resize and access, and is less vulnerable to being cut off by a responsive crop.
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