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1. Give every image the right text alternative
W3C’s Images Tutorial states: “Images must have text alternatives that describe the information or function represented by them.” The correct alternative depends on purpose, not on whether an image looks attractive.
Informative photographs
Write concise alt text that conveys the image’s essential information in its page context. For a gallery of a hiking trip, alt="Hikers crossing a wooden bridge over a misty valley" is useful; alt="beautiful hiking photo" is vague. Do not repeat captions, surrounding headings, or keyword lists when they add no information. See the W3C WAI Images Tutorial.
Decorative images
If an image contributes no information and is purely ornamental, use an empty alternative: alt="". Keep the attribute present so assistive technology knows the image has been intentionally treated as decorative.
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Images that perform an action
When a thumbnail is a link or button, its alternative should communicate the destination or action, not merely its appearance. For example, alt="Open night market photo, image 4 of 12" tells a screen-reader user what activating it does. If a visible caption already identifies the destination, avoid making the alternative unnecessarily repetitive.
2. Choose a layout around the reader’s task
No grid, masonry layout, carousel, or lightbox is universally best. Choose by how people need to discover, compare, and open images.
| Pattern | Works well when | Watch for |
|---|---|---|
| Uniform grid | Visitors scan many images and need predictable positions. | Very different aspect ratios can create awkward cropping; preserve the subject or provide an uncropped view. |
| Masonry | Images have varied proportions and visual browsing is the primary task. | Changing row positions can make keyboard and low-vision navigation harder to predict. |
| Carousel | A small, ordered set should be viewed one item at a time. | Controls, focus handling, status text, and motion can be missed on mobile or by assistive-technology users. |
| Lightbox | A thumbnail grid should open a larger image without leaving the page. | Trap focus while open, provide an obvious close control, support Escape, and return focus to the launching thumbnail. |
Use clear, consistent controls and labels. Ensure thumbnails are keyboard reachable, have visible focus, and expose the current image and total count when a viewer opens. A gallery should remain understandable when CSS, hover effects, or JavaScript behavior is unavailable.
3. Make the gallery reflow on every viewport
Images should fit their containers without distortion or unexpected horizontal scrolling. A basic responsive rule is:
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display: block;
max-width: 100%;
height: auto;
}
W3C Technique C37 describes this max-width and proportional-height approach as one way to support reflow; it is advisory rather than the only conforming implementation. Use a flexible grid, test narrow phones, tablets, desktop windows, and browser zoom, and keep controls large enough to activate by touch. W3C’s design tips also recommend viewport-adaptive layouts and clear, consistent navigation.
Do not rely on color alone to indicate the selected image. Pair visual states with text, borders, or ARIA state where appropriate. Check that captions remain associated with their images and that zooming does not hide the close or next controls.
4. Send an image size that fits the display
Do not routinely send a desktop original to every phone. Generate several width candidates and let the browser choose with srcset and sizes:
<img
src="photos/alps-800.jpg"
srcset="photos/alps-400.jpg 400w,
photos/alps-800.jpg 800w,
photos/alps-1600.jpg 1600w"
sizes="(max-width: 700px) 100vw, 33vw"
width="1600" height="1067"
alt="Hikers crossing a wooden bridge over a misty valley"
>The sizes value should describe the rendered slot, not the source file’s dimensions. Use <picture> when art direction requires a different crop at a breakpoint, or when offering a format with a fallback. Google’s Image SEO guidance and Chrome’s image and media optimization guidance cover these responsive-candidate patterns. The cited guidance does not establish a universal quality setting or file-size target, so choose compression by visual inspection and your content’s needs.
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Reserve the image’s space
Include intrinsic width and height (or an equivalent aspect-ratio box) so the browser can calculate layout before the file arrives. This prevents captions, buttons, and surrounding content from jumping as images decode.
5. Load images at the right time
Images below the initial viewport are good candidates for loading="lazy":
<img src="photos/alps-800.jpg" loading="eager" width="1600" height="1067" alt="...">Keep the prominent image already visible on the first screen eager. Indiscriminate lazy loading can delay the image people need first. For that image, omit loading="lazy"; where supported, consider an appropriate fetch priority. The web.dev responsive-images guide discusses lazy loading, eager loading for prominent images, and fetch priority.
Lazy loading is not a substitute for responsive candidates. A gallery can still be slow if every deferred image is an oversized original once it enters view. Test scrolling through the entire gallery on a throttled mobile connection and watch for blank gaps, late captions, or images that pop in after the user has moved on.
6. Make carousels and motion accessible
If slides advance automatically, provide pause and stop controls that are available by keyboard and touch. Users must be able to halt movement that continues beyond five seconds; WebAIM identifies automatically cycling carousels as a common WCAG 2.2.2 failure pattern in its Accessible Images guidance.
- Announce the current slide and total count in a concise status message.
- Keep Previous, Next, Pause, and slide-selection controls consistently placed.
- Do not move keyboard focus automatically when a timer advances.
- Respect a user’s reduced-motion preference and avoid parallax or animated zoom that is not needed to understand the image.
7. Captions, metadata, and image context
Alt text is not a caption. Use a visible caption for location, date, creator, or story details that many visitors need. Keep the caption in the same semantic component as its image, and make long descriptions available without forcing every thumbnail to carry a paragraph of text. If copyright or licensing information matters, expose it in the detail view or an adjacent information panel rather than hiding it in an inaccessible hover state.
8. Test before publishing
- Navigate the gallery with Tab, Enter, Space, Escape, and arrow keys where those keys are documented by the control.
- Use a screen reader to verify that informative, decorative, and functional images are announced as intended.
- Zoom the browser and test a narrow viewport; confirm there is no horizontal scroll or clipped control.
- Disable JavaScript temporarily and confirm that images, links, and essential captions remain usable.
- Throttle the network and scroll steadily; check that reserved space prevents layout movement and that the first image appears promptly.
- Run a motion check: automatic movement must be pauseable, and reduced-motion settings should avoid unnecessary animation.
- Inspect generated image URLs, dimensions, and format fallbacks in browser developer tools.
9. Troubleshooting common gallery failures
Images are stretched or cropped badly
Check conflicting fixed width and height rules. Use proportional sizing, an explicit aspect-ratio strategy, and a deliberate object-fit choice. If cropping removes important content, provide an uncropped detail view.
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The page jumps while images load
Add intrinsic dimensions or an aspect-ratio container before the request starts. Ensure the placeholder uses the same ratio as the delivered candidate.
Mobile users download huge files
Verify that srcset candidates exist at useful widths and that sizes matches the actual CSS slot. A wrong sizes value can make the browser select a desktop resource.
The main image appears late
Remove lazy loading from the above-the-fold image, reduce its candidate width, and avoid scripts that delay discovery of the image URL. Consider fetch priority only for the genuinely prominent image.
Keyboard users cannot operate the viewer
Use real buttons and links, provide visible focus, implement a predictable tab order, support Escape to close, and return focus to the thumbnail that opened the viewer. Test without a mouse.
Screen readers announce meaningless thumbnails
Replace filename-based or keyword-stuffed alternatives with concise purpose-based text. Use alt="" for decoration and action-oriented alternatives for links or buttons.
Best Value
10. A practical implementation sequence
- Inventory each image and classify it as informative, decorative, or functional.
- Design the reading and navigation model: grid, masonry, carousel, lightbox, or a combination.
- Set responsive layout rules and test zoom and small screens before polishing visuals.
- Generate width candidates, modern-format variants where useful, fallbacks, and intrinsic dimensions.
- Mark only below-the-fold images for lazy loading; keep the first prominent image eager.
- Implement keyboard, focus, status, pause, and reduced-motion behavior.
- Run the accessibility, layout, and throttled-network checks above on representative pages.
Or skip the browser setup
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import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
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FAQ
Should every gallery use a lightbox?
No. Use one when a larger view adds value without losing context; a direct image page or simple linked detail view may be clearer for some collections.
Is WebP always the best format?
No format is universally best. Choose a suitable modern format with a reliable fallback and verify visual quality and browser requirements for your audience.
How many images should appear per row?
Set the count from the image subject, caption length, and available viewport rather than a fixed universal number. Test the narrowest supported width and browser zoom.
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