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Use CSS’s opacity property on an <img> element or a class applied to it. A value of 1 is fully opaque, 0 is fully transparent, and values between them create translucency.
<img class="photo" src="photo.jpg" alt="Description of the photo">.photo {
opacity: 0.6;
}HTML provides the image; CSS controls how transparent it appears. The sections below show static transparency, hover fades, background-only transparency, accessibility safeguards, and the behavior that often surprises developers.
Set a fixed opacity on an image
Assign a class to the image and set opacity in your stylesheet:
<img class="photo" src="photo.jpg" alt="A mountain at sunrise">.photo {
opacity: 0.6;
}Opacity accepts numbers from 0 through 1. The same range can be written as percentages, such as 60%. A value of 0 makes the rendered image invisible, 0.5 makes it half-opaque, and 1 leaves it unchanged. Values below zero or above one are clamped to the valid range.
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Complete example
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Transparent image</title>
<style>
.photo {
display: block;
max-width: 100%;
opacity: 0.6;
}
</style>
</head>
<body>
<img class="photo" src="photo.jpg" alt="A mountain at sunrise">
</body>
</html>The image still occupies its normal layout space. Opacity changes the pixels that are composited, not the image dimensions.
Fade an image on hover
For a pointer-triggered fade, define an initial state, a transition, and a :hover state:
.photo {
opacity: 1;
transition: opacity 200ms ease;
}
.photo:hover {
opacity: 0.5;
}The transition interpolates between the two values over 200 milliseconds. Without transition, the image changes immediately when the pointer enters or leaves it.
Include keyboard focus
Hover is not available to keyboard users and has no consistent equivalent on touch devices. If the fade communicates an action, make the image a link or button and style its focus state as well:
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<img class="photo" src="photo.jpg" alt="Open the gallery">
</a>.photo-link .photo {
opacity: 1;
transition: opacity 200ms ease;
}
.photo-link:hover .photo,
.photo-link:focus-visible .photo {
opacity: 0.5;
}
.photo-link:focus-visible {
outline: 3px solid #1a73e8;
outline-offset: 4px;
}Do not hide essential information exclusively on hover. Put the same information in visible text, an accessible label, or an activated state.
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Respect reduced-motion preferences
A fade is motion, even though it is brief. Users who request reduced motion should not be forced to watch it:
@media (prefers-reduced-motion: reduce) {
.photo-link .photo {
transition: none;
}
}Choose between whole-image and background-only transparency
opacity applies to the element as a whole, including its descendants. If you set opacity on a card, its image, text, icons, and other children all become translucent together.
.card {
opacity: 0.7;
}When only the background should be translucent while text remains fully opaque, use an alpha color instead:
.card {
background: rgb(0 0 0 / 40%);
/* Older syntax: background: rgba(0, 0, 0, 0.4); */
color: white;
}This distinction matters for overlays, captions, navigation panels, and cards. Fading the container can make text difficult to read; an alpha background preserves the foreground content.
Overlay example
<figure class="hero">
<img src="hero.jpg" alt="Coastal cliffs">
<figcaption>Coastal cliffs at low tide</figcaption>
</figure>.hero {
position: relative;
margin: 0;
}
.hero img {
display: block;
width: 100%;
}
.hero figcaption {
position: absolute;
right: 0;
bottom: 0;
left: 0;
padding: 0.75rem 1rem;
color: #fff;
background: rgb(0 0 0 / 55%);
}Understand stacking and pointer behavior
An opacity value below 1 creates a new stacking context. That can change how the image participates in z-index ordering compared with neighboring elements. If an image appears behind or in front of an element unexpectedly, inspect the ancestor stacking contexts rather than adding arbitrary, very large z-index values.
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Opacity does not disable hit testing. An image at opacity: 0 can still occupy space, receive pointer events, and block clicks on elements behind it. If the invisible image should not intercept input, disable pointer events explicitly:
.is-hidden {
opacity: 0;
pointer-events: none;
}That rule does not remove the element from layout or the accessibility tree. Use display: none or the hidden attribute only when the content should be removed from layout and interaction altogether.
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Protect contrast
Reducing opacity on text or text overlays changes the final composited color and can lower contrast. Check the result against its actual background. The contrast targets commonly used for normal text are 4.5:1 and 3:1 for large text; large text is at least 18.66px when bold or 24px when not bold under the cited guidance.
Keep meaningful text at full opacity where possible. If a decorative image is faded, give it an appropriate alt value (or an empty alt when it is purely decorative). Do not rely on a low-contrast image to convey information that has no text equivalent.
Do not use opacity as the only disabled-state signal
A faded control can still be interactive, and an invisible control can still receive focus. Pair visual changes with a real disabled state, such as the disabled attribute on a button, when the control is unavailable.
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Useful patterns
Reusable utility classes
.opacity-25 { opacity: 0.25; }
.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }
.opacity-100 { opacity: 1; }Apply one class per image:
<img class="opacity-50" src="photo.jpg" alt="Product detail">Reveal an image after an interaction
.reveal {
opacity: 0;
transition: opacity 250ms ease;
}
.reveal.is-visible {
opacity: 1;
}JavaScript can add or remove is-visible after an explicit action or after an IntersectionObserver detects the image. Keep the class change separate from the CSS so the same visual state can be triggered by a button, keyboard activation, or another non-hover interaction.
Use a custom property for theming
:root {
--image-opacity: 0.8;
}
.photo {
opacity: var(--image-opacity);
}Changing the custom property lets a theme or component adjust the value without duplicating selectors.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot common problems
The image does not change
- Confirm the stylesheet is loaded and that the selector matches the element.
- Inspect the image in browser developer tools and check the computed
opacityvalue. - Look for a more specific rule or an inline style overriding your class. Fix the selector instead of reaching for
!importantunless you control the cascade deliberately.
The whole card, including text, is faded
Opacity is inherited as a composited effect from the container. Move the property to the image itself, or replace container opacity with an alpha background color.
The hover fade is not visible
- Make sure the initial and hover values differ.
- Check that another element is not covering the image and receiving the pointer.
- On touch devices, do not depend on hover; provide a tap or focus state.
A transparent image still blocks clicks
That is expected hit-testing behavior. Add pointer-events: none when the invisible layer must let clicks pass through, or remove it from the interface entirely when appropriate.
The image looks washed out over a white page
Transparency reveals whatever is behind the image. Set a deliberate background on the parent or use an opaque replacement color if the design requires consistent appearance.
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Performance and rendering considerations
Changing opacity is generally inexpensive, but animated opacity can cause the browser to create a composited layer. Apply will-change: opacity only when profiling shows a real problem; leaving it on many images can consume memory. Keep transitions short, avoid animating dozens of large images simultaneously, and test on mobile hardware.
Opacity does not reduce the file size or network cost of an image. Use appropriately sized files, modern formats, and responsive image markup independently of the visual effect:
<img
src="photo-800.webp"
srcset="photo-400.webp 400w, photo-800.webp 800w, photo-1200.webp 1200w"
sizes="(max-width: 600px) 100vw, 800px"
alt="A mountain at sunrise"
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cURL
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpPython
import requests
r = requests.get(
"https://api.screenshotneo.com/v1/shot",
params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"},
timeout=90,
)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)Node.js
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`Screenshot failed: ${res.status}`);
const bytes = new Uint8Array(await res.arrayBuffer());
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Frequently Asked Questions
Can I use a percentage instead of a decimal for opacity?
Yes. CSS accepts percentages from 0% to 100%; for example, 60% is equivalent to 0.6.
Does opacity make an image file smaller?
No. It changes rendering only. Optimize dimensions, format, and responsive delivery separately.
Why can an opacity-zero image still be clicked?
Opacity affects compositing, not hit testing. Add pointer-events: none or remove the element when it should not receive input.
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How do I fade only the image, not its caption?
Apply opacity to the img element and keep the caption outside it, or use an alpha background for the caption container.
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