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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11To add an image to a web page, put an HTML <img> element where it should appear, point its src attribute to an image file, and provide an appropriate alt value. For example: <img src="images/photo.jpg" alt="A red bicycle leaning against a brick wall">. Then use CSS to make it fit the page and, when useful, supply its real dimensions to reserve space while it loads.
1. Put the image file where your website can serve it
Before writing the HTML, make sure the image exists at a location your page can reach. It might be in your website project, such as an images folder, or hosted elsewhere at a URL. The src value must identify the file accurately, and the browser must be able to fetch it.
Use a relative path for a file in your site
If your page is at the site root and the image is in a folder named images, the path can be images/photo.jpg. A relative path is resolved from the page’s location. That means a page in a subfolder may need a different path to reach the same image; check the relationship between the HTML file and the image folder.
Use an absolute URL for a remotely hosted image
You can put an image URL in src when the file is hosted elsewhere. The URL must point to an accessible image file, not merely a page that displays an image. Remote hosting also means the image’s availability and delivery depend on that host.
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2. Add the basic HTML image element
Place an <img> element in the HTML where you want the image to appear:
<img src="images/photo.jpg" alt="A red bicycle leaning against a brick wall">src identifies the image file. alt provides a text alternative. At least one of src or srcset is required for an image element, but a simple image can use only src. Use a supported image file format and check the path, filename, and capitalization if it does not load.
Include the image in a complete page
This minimal page shows the element in context. Save the HTML file beside the images folder, or adjust the path to match your project:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>A page with an image</title>
</head>
<body>
<h1>A bicycle</h1>
<img src="images/photo.jpg" alt="A red bicycle leaning against a brick wall" width="1200" height="800">
</body>
</html>The width and height values in this example are only correct if the image’s actual dimensions are 1200 by 800 pixels. Replace them with the image’s real dimensions.
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3. Write alt text for the image’s purpose
Alt text is not a caption or a required inventory of everything visible. Decide what text alternative makes sense from the image’s role in the surrounding content. W3C Web Accessibility Initiative (WAI), in its Images Tutorial, states: “Images must have text alternatives that describe the information or function represented by them.”
Informative images
For an image that contributes information, briefly convey the essential point. In the example, “A red bicycle leaning against a brick wall” tells a reader what is shown. If the surrounding text already explains the same fact, avoid needlessly duplicating it; consider whether the image adds information the text alternative should convey.
Decorative images
If an image is purely decorative and adds no meaningful content or function, use an empty alt value: alt="". This lets assistive technology ignore the image. Do not use an empty value as a general shortcut for an image that communicates information.
Images that act as links or controls
If clicking an image performs an action or takes a visitor somewhere, make the alternative describe the function or destination. For example, the useful text for a linked company logo may be the company name or the destination, depending on the context—not a description of its colors and shape.
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Charts and complex diagrams
A short alt value may not be enough to communicate a chart’s data or a detailed diagram. Provide enough text to convey the important information, and include a fuller explanation in nearby page content when needed. The text alternative should serve the image’s purpose, not simply announce that a chart exists.
WCAG 2.2 Success Criterion 1.1.1 requires text alternatives for non-text content that serve an equivalent purpose, subject to its specified exceptions. WAI’s H37 technique describes using the alt attribute on img elements; the appropriate value still depends on context.
4. Set the image’s dimensions and make it responsive
Adding the image’s actual intrinsic width and height helps the browser work out its aspect ratio and reserve space before the file finishes loading. That can reduce unexpected movement in the page layout. CSS determines how large the image is rendered; the HTML dimensions should describe the file, not serve as arbitrary styling numbers.
<img
src="images/photo.jpg"
alt="A red bicycle leaning against a brick wall"
width="1200"
height="800">A basic fluid-image rule lets an image shrink to fit its container without distorting its proportions:
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img {
max-width: 100%;
height: auto;
}With max-width: 100%, the rendered image will not exceed the available width. height: auto preserves its proportions as it shrinks. WAI’s C37 is an advisory technique for fitting images this way, not the only way to meet accessibility requirements.
Check that the page remains usable at narrow viewport widths. WCAG 2.2 Success Criterion 1.4.10 Reflow specifies vertical content at a width equivalent to 320 CSS pixels and horizontally scrolling content at a height equivalent to 256 CSS pixels, with exceptions for content that requires a two-dimensional layout. These are technical thresholds, not a guarantee that every individual image layout will work well automatically.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.5. Choose the right image source strategy
One src is often all a small page needs. If you have several versions of the same image or need different crops or formats in different circumstances, HTML provides additional source-selection options.
| Approach | Use it when | What to check |
|---|---|---|
src |
You have one suitable image file for the page. | Verify the path and that the file is the right size for its intended display. |
srcset with sizes |
You have multiple resolutions of the same image and want the browser to choose among them. | Use accurate width candidates and a sizes hint that reflects the layout. |
<picture> |
The source itself needs to change, such as for alternate formats or art-directed crops. | Check the current HTML syntax and browser support for the sources you use. |
Offer width candidates with srcset and sizes
Use width descriptors such as 400w and 800w when listing image files at different intrinsic widths. The sizes attribute gives the browser a hint about how wide the image is expected to appear in the layout. The browser selects from the candidates, with discretion to account for conditions such as bandwidth. Do not mix width (w) and pixel-density (x) descriptors in one srcset.
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<img
src="images/landscape-800.jpg"
srcset="images/landscape-400.jpg 400w,
images/landscape-800.jpg 800w,
images/landscape-1600.jpg 1600w"
sizes="(max-width: 600px) 100vw, 800px"
width="1600"
height="1000"
alt="Snow-covered mountain reflected in a lake">This is a pattern, not markup to copy without checking your assets. Make sure each candidate exists, its descriptor matches its real width, and the intended rendered size matches the page layout. The width and height attributes should describe the image’s intrinsic dimensions.
Use picture when resolution is not the only difference
Use <picture> when the browser should have source alternatives—for example, different image formats or a crop designed for a different layout. Use srcset and sizes for choosing among sizes of the same image; use <picture> when the source itself should vary. Consult the current MDN <img> reference for exact syntax and browser support, which can change.
6. Troubleshoot an image that does not appear or fit
- Broken-image icon or missing image: Check that the
srcpath points to the right location from the page’s location. Verify spelling, capitalization, file extension, and that the file is accessible. - Image appears stretched: Avoid forcing a rendered width and height that conflict with the image’s aspect ratio. For a fluid image, use
max-width: 100%; height: auto;. - Image overflows its container: Apply the responsive CSS rule and check for other CSS that sets a larger fixed width.
- Space jumps when the image loads: Add the image’s actual intrinsic
widthandheightattributes so the browser can reserve its ratio and space. - Image is visible but its meaning is not conveyed: Review whether the image is informative, decorative, functional, or complex, then choose the corresponding text alternative. An empty
altis for decoration, not for every image. - A responsive candidate is not selected as expected: Confirm that the files and width descriptors agree, the
sizeshint reflects the layout, and you have not mixedwandxdescriptors in onesrcset.
Or skip the browser setup
If what you need is a screenshot of a web page as an image file, ScreenshotNeo can return a PNG, JPEG, or WebP from one API request. That is different from hosting an image for your page: after receiving the screenshot file, you still need to put it somewhere your site can serve and reference it with src. See the ScreenshotNeo API documentation.
Quick Recap
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpCookie banners, popups, and chat widgets are removed before the shot; those steps can be turned off. Bot checks, blank pages, failed loads, timeouts, and cache hits are not billed, and the response identifies the page verdict and billing status in headers. An MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Learn about ScreenshotNeo, or sign up for 1,000 free screenshots a month with no card.
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