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HTML places an image on the page; CSS controls how transparent it looks. Add a class to the <img> element and set that class’s opacity to a number from 0 (invisible) to 1 (fully opaque), or use an equivalent percentage.
The basic method
Put the image in your HTML and apply a class. Then set opacity in CSS:
<img class="photo" src="photo.jpg" alt="Description of the photo">.photo {
opacity: 0.6;
}The image remains in the document and keeps its layout space, but only 60% of its rendered pixels are opaque. The page behind it shows through the remaining 40%.
Opacity values and percentages
opacity: 1oropacity: 100%leaves the image fully opaque.opacity: 0.5oropacity: 50%makes it half transparent.opacity: 0oropacity: 0%makes it invisible.
Values between zero and one are translucent. CSS also accepts percentages from 0% through 100%. A value outside the useful range is clamped to the nearest endpoint, so it is clearer and less error-prone to write a value in that range.
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Make an image fade on hover
Use a normal opacity for the resting state, a transition for smooth movement, and a lower value for :hover:
.photo {
opacity: 1;
transition: opacity 200ms ease;
}
.photo:hover {
opacity: 0.5;
}The transition duration is 200 milliseconds in this example. Change it to suit the design, but avoid making an important control so subtle that users miss the state change.
Support keyboard and touch users
A hover-only change is unavailable on many touch devices and can be difficult to discover with a keyboard. If the fade communicates information or reveals a control, provide an equivalent focus or activated state:
.photo {
opacity: 1;
transition: opacity 200ms ease;
}
.photo:hover,
.photo:focus-visible {
opacity: 0.5;
}This works when the image itself is focusable, such as an image inside a link. For a plain decorative image, put the focus styles on the interactive parent instead:
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display: inline-block;
}
.image-link img {
opacity: 1;
transition: opacity 200ms ease;
}
.image-link:hover img,
.image-link:focus-visible img {
opacity: 0.5;
}Do not make essential information available only through hover. Touch users should get the same information through the normal page content or an explicit control.
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Respect reduced-motion preferences
A fade is motion, even though it does not move the image across the page. You can remove the transition for visitors who request less motion:
@media (prefers-reduced-motion: reduce) {
.photo {
transition: none;
}
}The opacity state still changes; only the animated interpolation is removed.
Fade the image without fading text or controls
The opacity property applies to the entire element and all of its descendants. If you put an image and a caption inside one container and lower the container’s opacity, the caption fades too. A value below one also creates a new stacking context, which can change how that element’s z-index interacts with neighboring elements.
When only a background should be translucent while text stays fully readable, use an alpha color on the background instead of lowering the parent’s opacity:
.card {
background: rgb(0 0 0 / 40%);
/* Legacy-compatible form: */
/* background: rgba(0, 0, 0, 0.4); */
}Here the background color is composited at 40% opacity, while text and child controls retain their own opacity. This is the appropriate pattern for a translucent panel, overlay, or caption background.
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Complete examples you can paste into a page
Static translucent image
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.photo {
max-width: 100%;
opacity: 0.65;
}
</style>
</head>
<body>
<img class="photo" src="photo.jpg" alt="A mountain at sunset">
</body>
</html>Hover and keyboard fade
<style>
.photo-link {
display: inline-block;
}
.photo-link img {
display: block;
opacity: 1;
transition: opacity 200ms ease;
}
.photo-link:hover img,
.photo-link:focus-visible img {
opacity: 0.5;
}
@media (prefers-reduced-motion: reduce) {
.photo-link img {
transition: none;
}
}
</style>
<a class="photo-link" href="/gallery">
<img src="photo.jpg" alt="Open the photo gallery">
</a>Reusable values with a custom property
:root {
--image-opacity: 0.72;
}
.photo {
opacity: var(--image-opacity);
}A custom property is useful when a design system has one approved image treatment. Keep the final value between zero and one (or use a percentage) so the intent is obvious during code review.
What opacity changes—and what it does not
Layout and sizing
Opacity changes painting, not layout. An invisible image still has its intrinsic or CSS-defined dimensions, affects surrounding flow, and can reserve space. Use display: none or another layout technique only when you genuinely want the element removed from layout; do not use opacity as a substitute.
Pointer and keyboard interaction
Opacity does not disable hit testing. An image at opacity: 0 can still receive pointer input if it is interactive, and an invisible overlay can block clicks on content underneath. If an element should not be interactive, change its interaction behavior explicitly, for example by removing the link or using an appropriate state and focus management.
Layering
Because an opacity below one establishes a stacking context, descendants are composited together before the result is placed in the surrounding stack. If a badge, tooltip, or positioned child appears behind an element that used to be above it, inspect the parent’s opacity and the neighboring stacking contexts before changing arbitrary z-index values.
Accessibility and readability checks
Lowering the opacity of text, icons, or text placed over an image can reduce contrast. Keep meaningful text at full opacity where possible, then test the final composited colors against the actual background. MDN’s accessibility guidance cites WCAG contrast ratios of at least 4.5:1 for ordinary text and 3:1 for larger text; its definition of larger text is at least 18.66px when bold or 24px when not bold.
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- Do not fade an image’s only text label until it becomes hard to read.
- Use descriptive
alttext for informative images; opacity does not change what assistive technology receives. - Keep keyboard focus visible even when a hover or focus state changes opacity.
- Check the design in light and dark contexts, because the background showing through changes the perceived contrast.
Choosing the right technique
| Goal | Recommended CSS | Result |
|---|---|---|
| Make the entire image translucent | img { opacity: 0.6; } |
The image and its rendered descendants are composited at 60% opacity. |
| Fade on hover or focus | :hover and :focus-visible with transition |
The image changes state when the user points to or focuses it. |
| Keep text opaque over a translucent panel | background: rgb(0 0 0 / 40%); |
Only the background color is alpha-composited. |
| Hide an element and remove its layout space | Use a deliberate layout or visibility strategy rather than opacity | Opacity alone will not remove the element from flow or hit testing. |
Troubleshooting common problems
The image looks unchanged
- Confirm the stylesheet is loaded and the selector matches the image’s class exactly.
- Inspect the element in browser developer tools and check whether another rule overrides
opacity. - Look for an inline style or a more specific selector. Fix the cascade rather than adding
!importantas a first resort.
The whole card, including text, is faded
You applied opacity to the card instead of the image. Move the declaration to the img selector, or use an alpha background color for the card.
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Hover is not a reliable touch interaction. Keep the image readable by default and provide an explicit tap action or an equivalent focus/activated state.
A transparent image still blocks a button underneath
The element is still hit-testable. Remove the overlay from the interactive path or change its interaction state when it is not meant to receive input. Do not assume opacity: 0 means “not there.”
A tooltip or badge appears behind another layer
Check whether a parent has opacity below one, which creates a stacking context. Reorganize the positioned elements or apply the layering to a more appropriate wrapper.
The text fails contrast after the fade
Measure the final colors against the actual background and restore full opacity for meaningful text. Adjust the background, text color, or layout rather than relying on a barely visible label.
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Testing and performance notes
Test the resting, hover, focus, and activated states at the actual image size. Check keyboard-only navigation, a touch device, zoomed text, and both color-scheme contexts used by your site. A simple opacity transition is generally inexpensive, but a page with many large, continuously animated images can still consume compositing and battery resources. Keep transitions short, avoid animating dozens of full-viewport images simultaneously, and honor prefers-reduced-motion.
Opacity does not change image download size. If bandwidth is the problem, use appropriately sized responsive images with srcset and sizes; use opacity only for the visual treatment.
Or skip the browser setup
If you need rendered screenshots of pages with this styling rather than a local browser workflow, ScreenshotNeo provides a website screenshot API and MCP server. It accepts a URL and returns PNG, JPEG, WebP, or PDF; its options include custom CSS and JavaScript, device presets, viewport and retina settings, full-page capture, element selection, waits, and dark mode. You can use those options to capture a page after applying the opacity rule in your own site.
One GET request is enough:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo documentation for authentication and the complete option list. Equivalent Python and Node.js requests are:
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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' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);ScreenshotNeo accepts cookie and consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets; each cleanup step can be disabled. Bot checks, CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers identify the page verdict and billing result. Its MCP server supplies take_screenshot, get_page_info, and capture_pdf tools to Claude, Cursor, and other MCP clients.
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Frequently Asked Questions
Can I use a percentage instead of a decimal for image opacity?
Yes. CSS accepts percentages from 0% to 100%; choose the form that makes your design token easiest to read.
Why does an invisible image still take up room?
Opacity changes painting only. The element keeps its dimensions and layout participation until you use a separate layout or visibility technique.
Should I put opacity on a parent or on the image?
Put it on the image when only the image should fade. Put an alpha color on the background when child text and controls must remain fully opaque.
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