The Tool Desk
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This guide starts with quick checks for nontechnical site owners, then shows a developer-level diagnosis for HTML, responsive images, headers, policies and lazy loading.
Quick checks before changing code
- Reload and check the address. Right-click the broken image, choose to open it in a new tab, and confirm the address is the file you intended to publish. Check spelling, capitalization, folders and the file extension.
- Try another browser or a private window. This can reveal a stale cache, extension, login or local service-worker problem. It does not replace checking the actual request.
- Scroll to the image. An image marked
loading="lazy"may intentionally wait until it is near the viewport. - Inspect the rendered page. A template may produce different HTML from the source file you edited. Look at the live element and its selected
src,srcsetor<picture>source.
If these checks do not explain the failure, use the Network and Console workflow below.
Use DevTools to identify the exact failure
- Open Chrome, Edge or another Chromium browser’s developer tools with
F12orCtrl+Shift+I(Windows/Linux) orCmd+Option+I(macOS). - Select Network, filter the request list to Img (or type
imagein the filter), and reload the page while DevTools remains open. DevTools records activity only while it is open. - Select the failed request. Check its full URL, status, type, initiator, response headers and Response/Preview tabs.
- Open Console and read the corresponding error. A CORS, CSP, mixed-content or decoding message points to a different fix than a 404.
Use the observed result, not a guess, to choose the next step.
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| What you see | Likely area | First corrective action |
|---|---|---|
| No image request | Rendered markup, JavaScript or lazy-load trigger | Confirm a nonempty selected source is assigned and can be requested. |
| HTTP error such as 404 | Path, deployment, origin or server | Correct the URL or publish the file at that exact location. |
| Request succeeds but preview is invalid | Response body, file integrity or format | Return image bytes, not an HTML error page, and verify the format. |
| CORS error | Cross-origin request and response headers | Configure an appropriate allow-origin response only when cross-origin access is required. |
| CSP blocked | img-src or default-src |
Allow the intended image origin in the applicable policy. |
| Mixed-content warning or block | HTTP image on an HTTPS page | Use an HTTPS asset URL where the origin supports it. |
| Request appears after scrolling | Lazy loading or missing dimensions | Check intersection and dimensions; do not defer a critical visible image. |
Fix the image URL and rendered HTML
Check src for empty, null or unintended values
An image cannot load if the browser receives an empty source, a null value, a URL pointing to the current page, or a path that differs from the deployed file. Inspect the live DOM, not just a template. Confirm that a relative URL is relative to the page you expect and that capitalization matches the server’s filesystem.
<img src="/images/team-photo.webp" alt="Team standing outside" width="1200" height="800">Open that exact URL directly. If it does not display, fix the deployment, permissions, redirect or origin before changing page code.
Validate srcset and <picture>
Responsive markup can select a different candidate from the fallback src. In DevTools, inspect the request that was actually made and verify that file exists.
<picture>
<source media="(min-width: 900px)" srcset="/images/hero-large.webp">
<img src="/images/hero-small.webp" alt="Product dashboard" width="800" height="500">
</picture>A valid fallback does not help if the selected source has a typo, was omitted from the deployment, or is served from the wrong origin.
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Make sure the response is really an image
A server can return status 200 while sending an HTML login page, framework error page or proxy message. Use Network’s Preview and Response tabs and inspect the Content-Type. The body must contain valid image data in a format the browser supports. Corrupt bytes, truncated files and unsupported formats produce a broken image even when the URL looks correct.
Resolve HTTPS, CSP and CORS blocks
Mixed content
If the document loads over HTTPS but the image URL begins with HTTP, the browser may upgrade the request or block it, depending on the request and browser handling. Replace it with the HTTPS version when available. Do not “fix” the warning by weakening the security of the entire page.
Content Security Policy
Read the Console message and the page’s Content-Security-Policy response header. The img-src directive lists permitted image sources. If img-src is absent, default-src can govern images.
Content-Security-Policy: default-src 'self'; img-src 'self' https://images.example.com;Add only the image origin you operate or intentionally trust. A wildcard policy may hide the symptom while creating a broader security problem.
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Cross-origin requests
CORS is separate from ordinary image display. When markup or script uses crossorigin, the browser makes a CORS request and the image server must return a suitable Access-Control-Allow-Origin value for your site. Configure the response on the image origin, not only in page JavaScript.
If the image is merely displayed and no script needs to read its pixels, remove an unnecessary crossorigin attribute rather than opening access broadly. If a canvas, editor or other script must read the image, keep the attribute and configure the server for the precise site origin.
Fix lazy loading and layout-dependent failures
loading="lazy" defers an offscreen image until it approaches the viewport. Scroll it into view while watching Network. Give it real dimensions with HTML attributes or CSS so the browser can calculate layout and intersection.
<img src="/images/article.webp" alt="Article illustration" loading="eager" width="1200" height="675">A lazy image with zero dimensions may never intersect a visible element. For a hero or other important image already in the initial viewport, remove lazy loading or use eager loading so it is not unnecessarily deferred. Also check whether JavaScript is expected to copy a data attribute into src; if that script fails, no request will appear.
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Repair by symptom: a practical decision path
No request in Network
- Inspect the live
<img>and any<source>elements. - Check for empty attributes, a script error, a hidden template, or a lazy image that has not reached the viewport.
- Confirm the browser selected the candidate you think it selected.
404, 403 or redirect loop
- Copy the exact requested URL from Network.
- Check path, capitalization, deployment location and file permissions.
- Follow redirects and confirm the final response is on the intended origin.
200 response but broken preview
- Inspect the body for an HTML error or login page.
- Verify image bytes, format and file integrity.
- Check that the server’s content type matches the asset.
Policy error
- Use the exact Console wording to distinguish CORS, CSP and mixed content.
- Change only the implicated URL, header or attribute.
- Reload with DevTools open and confirm the new request and response.
Prevent recurring image failures
- Keep image paths and capitalization consistent between local development and production.
- Publish responsive candidates together with the page that references them.
- Set width and height to reserve layout space and make lazy loading reliable.
- Use HTTPS asset URLs on HTTPS pages.
- Maintain a narrowly scoped CSP and document each approved image origin.
- Test authenticated, redirected and CDN-served URLs; a browser receiving an HTML error page cannot decode it as an image.
- Capture the Network status, final URL and response preview when reporting a bug so another developer can reproduce the diagnosis.
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For ordinary website repair, the browser’s Network panel is the fastest diagnostic because it shows the request your visitor actually made. Screenshot automation is useful when you need repeatable captures across URLs, devices or authenticated states, but it does not replace fixing a missing file, invalid response, CSP rule or CORS configuration. When using any capture workflow, record the target URL, viewport, selected resource and response status so a visual difference can be tied to a concrete request failure.
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Frequently Asked Questions
Why does an image work when opened directly but not on the page?
The page may select a different responsive candidate, or a CSP, CORS or mixed-content rule may block the embedded request. Compare the URL requested in Network with the URL you opened directly and read the Console message.
Can clearing the browser cache fix a broken image?
It can remove a stale cached response or service-worker asset, but it will not repair a wrong path, invalid file, server error or policy block. Confirm the current request first.
Should every image use lazy loading?
No. Lazy loading suits offscreen content, but a visible hero should generally load immediately. Lazy images also need nonzero dimensions so intersection detection can work.
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