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To generate an image URL for a website, first put the image file somewhere your site’s visitors can access—such as your site’s deployed assets, object storage, or an image-delivery service. Then use that location as the image’s URL in an HTML <img src="..."> element. A URL points to the file; it does not create, upload, or host the image.
What an image URL is—and what it is not
An image URL is the address at which a browser can request an image file. For example, images/dinosaur.jpg is a relative path that can refer to an image deployed with a site, while https://www.example.com/images/dinosaur.jpg is an absolute URL naming a host and path.
There is no general HTML command that creates a hosted image URL from a picture on your computer. You must first upload or deploy the file to a location that can serve it. Once that is done, use the file’s path or delivery URL in your page. If the file is private or the server does not allow visitors to read it, the URL will not make it accessible.
Use an image URL in HTML
Put the address in the src attribute and give the image meaningful alternative text in alt:
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<img src="images/dinosaur.jpg" alt="Dinosaur">The browser requests the resource specified by src. The alt text is a textual replacement for the image, useful to people using screen readers and when the image cannot be displayed. Describe the image’s relevant content rather than repeating its filename.
For an image hosted on a separately named domain, use its complete address instead:
<img src="https://www.example.com/images/dinosaur.jpg" alt="Dinosaur">HTML also supports srcset for offering alternative image sources; an image element must have at least src or srcset. If you know the image’s intrinsic dimensions, providing width and height can reserve its layout space while it loads:
<img src="images/dinosaur.jpg" alt="Dinosaur" width="640" height="480">Choose where to host the image
The right route depends on who should control the file, how you plan to update it, and what delivery features you need. Neither self-hosting nor a managed image service is universally better for cost or performance; those outcomes depend on the configuration and service.
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|---|---|---|
| Deploy the image with your website | Use a relative path such as images/dinosaur.jpg, or the site’s absolute host-and-path URL. |
You control the asset and path through your site deployment. Keep file and directory capitalization consistent with the deployed names. |
| Object storage or a website endpoint | Use the endpoint and object path provided by the storage configuration. | Set permissions so intended viewers can read the object. AWS S3 website endpoints are HTTP-only; AWS documents CloudFront or Amplify Hosting for HTTPS delivery. |
| Managed image service | Use the delivery URL associated with the uploaded asset; some services also accept transformation parameters. | The service manages delivery URL conventions and may provide on-demand transformations. Those URL formats and capabilities are service-specific. |
Use images that you own or have permission to embed. Pointing your page at another website’s image without permission can also leave you dependent on a file and URL controlled by someone else.
Method 1: deploy the image with your site
- Add the file to the site’s assets. For example, place
dinosaur.jpgbeside the HTML file, or put it in animagessubdirectory. - Write the path relative to the page. If the page and file share a directory, use
dinosaur.jpg. If the file is insideimages, useimages/dinosaur.jpg. - Reference the file in the page. Set
srcto that path and include appropriatealttext. - Deploy both the page and image. The URL only works for visitors if the image is actually present at the deployed location.
- Check the published page. Test from the page’s real deployed address, not only from a local preview. Confirm that the image request succeeds and that capitalization matches the deployed file and directory names.
A relative URL is resolved in relation to the page’s location. If a page lives in a different directory than you expected, the same relative path can point somewhere else. Use the browser’s actual page location when diagnosing a path that works on one page but not another.
Method 2: use an object-storage URL
You can store an image as an object and reference the URL formed from the storage website endpoint and object path. The intended audience must have permission to read it. A URL to an object that is not publicly readable will not make that object public by itself.
For Amazon S3 static website hosting, the website endpoint is part of the URL. AWS states that these website endpoints do not support HTTPS. If the image needs HTTPS delivery, AWS documents CloudFront or Amplify Hosting as alternatives for serving the site. Check the endpoint and access configuration you use rather than assuming that every S3 URL has the same behavior.
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Method 3: generate a delivery URL with an image service
A managed image service can provide a URL for an uploaded asset and, depending on the service, encode transformations such as resizing or format changes into the delivery URL. This is not a built-in feature of HTML: the service defines how its asset identifiers and transformation parameters work.
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Cloudinary URL pattern
Cloudinary documents a basic image delivery URL in this form:
https://res.cloudinary.com/<cloud_name>/image/upload/<public_id>.<extension>Replace the placeholders with the cloud name and public ID for the asset in your account, plus its extension where applicable. The resulting delivery URL can be used as an image element’s src. Cloudinary also documents transformations in delivery URLs, but their syntax is specific to Cloudinary.
Generate one with Cloudinary’s JavaScript library
Cloudinary’s documented JavaScript example configures a cloud name, selects an image by public ID, and calls toURL():
import { Cloudinary } from "@cloudinary/url-gen";
const cloudinary = new Cloudinary({
cloud: { cloudName: "demo" }
});
const imageUrl = cloudinary.image("sample").toURL();
console.log(imageUrl);In that example, the generated URL is https://res.cloudinary.com/demo/image/upload/sample. Use the account’s cloud name and the identifier for your own uploaded asset when generating a URL for your site.
Keep upload credentials on the server
Generating a delivery URL from an asset identifier is different from uploading an image. For uploads, Cloudinary documents API authentication options and warns against exposing the API secret in public client-side code. Keep secrets on a trusted server, or use the service’s supported client-upload flow where appropriate. A secret embedded in browser JavaScript can be read by visitors and should not be treated as private.
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Make sure the URL will keep working
Before publishing an image URL, check the practical details that determine whether it works for the intended audience:
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- Deployment location: A relative path is resolved from the page’s location. Confirm it points to the intended directory after deployment.
- Exact spelling and case: Match the deployed filename and directory names exactly.
- Viewer access: Confirm the image host permits the people or systems expected to load the page to read the file.
- Transport security: If the page is served over HTTPS, choose an image delivery URL that supports HTTPS; an HTTP-only endpoint is not equivalent.
- URL stability: A self-hosted path can stop working if a file is renamed or moved. A managed service’s URL depends on its asset identifier and service-specific rules. Plan for references to change when replacing or reorganizing assets.
- Embedding permission: Use files you control or have permission to embed rather than relying on another site’s image address.
For a page that loads an image from a different host, test the image on the deployed page as well as opening its address directly. The page’s real location, the file’s access settings, and the exact URL all matter.
Or skip the browser setup
If your goal is to capture a webpage as an image rather than host an image file for use in an <img> element, ScreenshotNeo is a website screenshot API and MCP server. It captures a webpage; its screenshot URL or response is not a substitute for uploading an image to your site or image host. The following GET request saves a screenshot response to a local file. See the ScreenshotNeo API documentation for request details.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpScreenshotNeo removes cookie banners, newsletter popups, and chat widgets before the shot; each cleanup step can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and responses report the page verdict and billing status in headers. Its MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents using Claude, Cursor, or another MCP client. The free plan includes 1,000 screenshots per month with no card; paid plans start at $5 for 3,000. Sign up for 1,000 free screenshots a month, with no card required.
Troubleshoot an image that does not appear
The browser reports that the image cannot be found
Check whether the file was included in the deployment, whether the relative URL is being resolved from the page’s actual directory, and whether every directory and filename matches the deployed path exactly.
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Check the object or host’s read permissions and confirm that the URL is intended to be available to those visitors. A URL is only an address; it does not grant access to a protected file.
The address works over HTTP but not HTTPS
Check whether the selected endpoint supports HTTPS. In particular, AWS S3 website endpoints are HTTP-only; AWS documents CloudFront or Amplify Hosting for HTTPS delivery.
The image service URL does not match your asset
Verify the account’s cloud name, asset public ID, extension, and the service’s documented URL format. Transformation syntax is vendor-specific, so do not assume a URL pattern from one image service will work on another.
The upload works only when a secret is in the browser
Do not publish an API secret in client-side code. Move authenticated upload work to a trusted server or use the provider’s supported client-upload flow. A publicly visible delivery URL and a private upload credential serve different purposes.
Which approach should you use?
- Choose site assets when you deploy and maintain the website’s files together and a stable relative path suits your setup.
- Choose object storage when you want the file hosted separately, after checking access permissions and HTTPS delivery for the endpoint.
- Choose a managed image service when its asset delivery and transformation features fit your needs and you are comfortable using its URL conventions.
Whichever route you choose, the core HTML stays simple: make the image available at a reachable address, put that address in src, and write useful alt text.
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