The Tool Desk
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<img src="photo.jpg" alt="A description of the photo">That example works when photo.jpg is beside the HTML file. For an image in an images folder, use src="images/photo.jpg". The spelling, extension, folder names, and capitalization must match the actual file. If a visitor—not the site author—must choose an image from their computer, use a file input and JavaScript instead; a page cannot guess or prefill an arbitrary local path.
1. Add an image that belongs to your project
Organize the files first. A simple project might be:
project/
index.html
images/
photo.jpgWith that structure, index.html contains:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Local image example</title>
</head>
<body>
<img src="images/photo.jpg" alt="A description of the photo">
</body>
</html>If the file is in the same directory as index.html, remove the folder name:
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<img src="photo.jpg" alt="A description of the photo">The src value is a URL/path, not a label. A browser resolves a relative path from the document’s base URL. A <base> element, if your page has one, changes that base. This is why a path that looks correct can fail after moving a page into a different folder.
Use the exact filename
images/photo.jpgis different fromimage/photo.jpg.photo.jpgis different fromphoto.jpegandphoto.JPGon case-sensitive systems.- Spaces and unusual characters can make URLs harder to diagnose; simple lowercase names with hyphens are easier to maintain.
2. Write useful alternative text
alt communicates the image’s content or purpose to people who cannot see it and appears when the image cannot load. Describe what matters in the context of the page, not every visible detail. For example:
<img src="images/team.jpg" alt="Four engineers reviewing a circuit board">If the image is purely decorative and conveys no information, use an empty value:
<img src="images/ornament.svg" alt="">Do not omit alt; an empty value intentionally marks an image as decorative, while a missing attribute leaves its purpose unclear to assistive technology.
3. Reserve space with width and height
When the intrinsic dimensions are known, include them:
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<img
src="images/photo.jpg"
alt="A mountain trail at sunrise"
width="1200"
height="800">The browser can calculate the aspect ratio and reserve space before the file arrives, reducing layout movement. These attributes do not have to force the image to render at that exact CSS size; CSS can scale it while preserving the ratio:
img {
max-width: 100%;
height: auto;
display: block;
}For a fixed thumbnail, use a wrapper or an explicit crop policy rather than distorting the source:
.thumbnail {
width: 240px;
aspect-ratio: 3 / 2;
object-fit: cover;
}4. Understand relative paths, parent folders, and absolute URLs
Images below the HTML file
From pages/about.html, an image in pages/images/logo.png is:
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<img src="images/logo.png" alt="Company logo">Images above the HTML file
To reach a sibling folder from pages/about.html when the image is in images/logo.png at the project root, go up one level:
<img src="../images/logo.png" alt="Company logo">Each .. means “the parent directory.” Count from the folder containing the HTML file, not from the project root you have open in your editor.
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Root-relative and absolute URLs
A path beginning with /, such as /images/logo.png, is relative to the website’s domain root when served over HTTP. It is not generally the right choice for a page opened directly from disk because a file:// page has no normal site root. A complete URL such as https://cdn.example.com/photo.jpg references a remote resource and is not a bundled local project asset.
5. If you mean “let the visitor choose a local image”
HTML cannot silently read an arbitrary path on a visitor’s computer. The visitor must explicitly select a file through a file picker. Use an <input type="file">, then create a temporary object URL for a preview:
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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →<label for="image-file">Choose an image</label>
<input id="image-file" type="file" accept="image/*">
<img id="preview" alt="Selected image preview" hidden>
<script>
const input = document.querySelector('#image-file');
const preview = document.querySelector('#preview');
let previousUrl;
input.addEventListener('change', () => {
const file = input.files[0];
if (!file) {
preview.hidden = true;
return;
}
if (previousUrl) URL.revokeObjectURL(previousUrl);
previousUrl = URL.createObjectURL(file);
preview.src = previousUrl;
preview.hidden = false;
});
</script>input.files contains the files the user selected. URL.createObjectURL(file) creates a browser-managed temporary URL; revoke the previous URL when replacing it so repeated selections do not retain unnecessary resources. This previews the file locally. Uploading it to a server is a separate operation requiring a form submission or an API.
Validate before previewing or uploading
The accept="image/*" hint filters the picker but is not a security boundary. Check the selected file’s type and size in JavaScript for a better user experience, and validate again on the server if you upload it. Never trust a filename or MIME type supplied by a client as proof that the bytes are safe.
6. Test pages opened from disk versus a local server
Double-clicking index.html opens a file:// URL. Relative image paths can work there, but local-file resource and security behavior varies by browser and operating system. If the image fails or scripts behave differently, serve the project through a local development server instead. The important test is that the server’s document URL and folder layout match how the site will be deployed.
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- Confirm the image is inside the project directory that the server exposes.
- Open the page’s developer tools and inspect the failed image request.
- Read the requested URL and compare every directory, character, extension, and capitalization with the real file.
- Reload without a stale cache after renaming or replacing the image.
7. Troubleshoot a broken image
The browser shows a broken-image icon
- Wrong base folder: Calculate the path from the HTML file’s directory. Add or remove
../as required. - Typo or case mismatch: Copy the filename from the file manager or editor and check the extension.
- File is outside the served project: Move it under the directory your development server publishes.
- A
<base>element changes resolution: Inspect the document head and adjust the path for that base URL.
The image appears but looks stretched
Set height: auto for proportional scaling, or use object-fit: cover when a deliberate crop is required. Do not solve a layout problem by changing only one of the HTML dimensions.
The preview stays blank after file selection
Check that the event listener runs, that input.files[0] exists, and that the preview’s hidden property is cleared. If you reuse object URLs, revoke the old URL only after assigning the new one—not before.
It works on one computer but not after deployment
Deployment commonly exposes case errors that a case-insensitive local filesystem hides. Verify the uploaded file’s exact case and inspect the network request on the deployed page. Also check whether your hosting setup rewrites document URLs, because rewrites can change the relative base.
8. Performance and reliability choices
- Choose an appropriate image format and dimensions before shipping; a camera-original file is often much larger than its display size.
- Keep intrinsic
widthandheightaccurate so layout space is reserved. - Use responsive CSS such as
max-width: 100%to prevent overflow on narrow screens. - Use
loading="lazy"for images that are well below the initial viewport, but do not defer the primary image a visitor needs immediately. - Keep project assets under predictable folders and use consistent lowercase naming.
Before publishing, verify both the source path and the deployed URL. A valid HTML element cannot compensate for a file that was never copied to the server.
9. A compact decision guide
| Need | Use | Important detail |
|---|---|---|
| Show a known project image | <img src="relative/path.jpg"> |
The path is relative to the document’s base URL. |
| Show an image selected by a visitor | File input plus JavaScript object URL | Explicit user selection is required; arbitrary local paths cannot be prefilled. |
| Decorative artwork | alt="" |
Use an empty alternative text value only when it adds no information. |
| Prevent image-related layout movement | Accurate width and height |
The browser can reserve the correct aspect ratio before loading. |
Or skip the browser setup
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See the parameter reference in the ScreenshotNeo documentation. The supplied cURL example is:
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r = requests.get(
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timeout=90,
)
r.raise_for_status()
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const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`Screenshot failed: ${res.status}`);
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Frequently Asked Questions
Can I use a Windows or macOS file path in src?
No. A path such as C:\Users\Me\photo.jpg or /Users/me/photo.jpg is not a portable web URL. Put the asset in the served project and reference it with a relative URL, or let the visitor select it with a file input.
Do I need JavaScript to display an image shipped with my website?
No. A normal project image needs only an <img> element and a correct src. JavaScript is needed for interactive tasks such as previewing a file chosen by a visitor.
Why does changing the HTML file’s folder break the image?
Relative URLs are resolved from the document’s base URL. Moving the HTML file changes that starting directory, so the same src may point to a different location.
Quick Recap
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