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If an HTML <img> element will not display a PNG, diagnose it in layers: first verify that src resolves to the deployed file, then inspect the actual network response and its Content-Type. After that, check responsive-image selection, cross-origin settings, and the file’s real format and integrity. A .png suffix by itself does not prove that the URL returns valid PNG bytes.
Start with a minimal, known-good image element
Reduce the markup to the simplest useful test:
<img src="images/photo.png" alt="Description of the image">Then check each part of the path:
- Filename: Compare every character, including underscores, hyphens and the extension. A reference to
unicorn_pics.pngwill not load a file namedunicorn_pic.png. - Capitalization: Many production servers use case-sensitive filesystems.
Photo.pngandphoto.pngmay be different files even if the page worked on a case-insensitive local computer. - Directory: A relative URL is resolved from the page URL, not necessarily from your project’s source folder. If the page is
/products/index.html,images/photo.pngnormally means/products/images/photo.png. - Deployment: Confirm that the image was uploaded or included in the deployed build. A file present in your editor is not automatically present on the web server.
Open the expected image URL directly in a new browser tab. If it returns a 404, an application error, a login page or an HTML error document, fix the URL or deployment before changing CSS or JavaScript. If the site works locally but not after publishing, compare the generated page and asset directories in the deployed environment.
Inspect the request in browser developer tools
- Open developer tools in your browser.
- Select the Network panel.
- Reload the page, preferably with the panel open so the request is recorded.
- Filter for
Imgor search for part of the filename. - Select the failed request and inspect its requested URL, status, response headers and response preview.
The request tells you which URL the browser actually used, which can differ from the source you expected because of a base URL, a framework-generated path or responsive-image selection. A 200 status means the HTTP request succeeded; it does not guarantee that the body contains a valid image. A 304 status means the browser can use its cached copy after the server confirms that it has not changed. A 404, 403, redirect loop, server error or blocked request points to a different layer of the problem.
Try the exact requested URL directly. If the browser displays an error page or downloads content that is not an image, the server or application is returning the wrong body even if the status is 200. Check the response preview and, where available, the response body rather than relying only on the status code.
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Verify the PNG MIME type
A correctly served PNG should have this response header:
Content-Type: image/pngBrowsers use media-type information when deciding how to interpret a response; they do not simply trust the filename extension. In the Network panel, open the response headers and check Content-Type. If the server sends a generic or unrelated type, configure the web server, static-file middleware, CDN or storage bucket to map PNG files to image/png. The exact setting depends on your hosting platform, so change the component that serves the asset rather than adding a different extension to the HTML.
A wrong MIME type can also indicate that the URL is reaching an application route instead of the static file. For example, an authentication page or JSON error may be returned with a successful HTTP status. Fix routing or permissions so the image URL returns the image bytes and the appropriate type.
Check srcset and sizes before blaming src
Responsive images can make the fallback URL appear correct while the browser requests a different, broken candidate:
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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →<img
src="images/photo.png"
srcset="images/photo-480.png 480w, images/photo-960.png 960w"
sizes="(max-width: 600px) 480px, 960px"
alt="Description of the image"
>When width descriptors such as 480w are present, browsers that support srcset choose a candidate using srcset and sizes; they may ignore src for the actual download. Inspect the selected request in Network tools and verify that that specific file exists, has the expected MIME type and contains valid image data. A stale build manifest, typo in one candidate, or an incorrect sizes value can therefore cause a failure that is invisible if you inspect only the fallback attribute.
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As a diagnostic, temporarily remove srcset and sizes and test one known URL. If the simple version works, repair the candidate URLs or the generated responsive-image configuration rather than changing the working fallback.
Handle cross-origin images and the crossorigin attribute
An image hosted on another origin can normally be displayed without adding crossorigin. That attribute changes the request to use CORS:
<img crossorigin="anonymous" src="https://cdn.example.test/photo.png" alt="Example image">When crossorigin is present, the remote server must grant permission for the requesting page’s origin. If it does not, the browser blocks the CORS request and reports a CORS error in the Console. Inspect both the Console and Network panels for the failed request and missing or mismatched Access-Control-Allow-Origin response header.
Remove crossorigin if you do not need to read the image’s pixels from canvas or another script. If you do need a CORS-enabled image, configure the image host to allow the specific site origin (or an appropriately controlled set of origins) and ensure the request mode and credentials policy match that server configuration. Do not treat CORS as a path or MIME-type fix; it is a separate permission check.
Confirm that the file is really a PNG
A file can be named .png while containing a different format, a truncated download or corrupted bytes. Replace or re-export the asset and open it with a trusted image viewer or image-processing tool. The PNG signature begins with the hexadecimal bytes 89 50 4E 47. Most page authors do not need to inspect bytes manually, but the signature is a useful check when a file was renamed, generated by a pipeline or downloaded from an unreliable source.
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- Re-export the image as PNG from the original editor.
- Compare the deployed file with the local file; a failed upload can leave a zero-byte or partial asset.
- Check that an image optimization step did not write WebP, JPEG or an HTML error document under a PNG name.
- Clear or invalidate a stale CDN and browser cache after replacing the file, then reload and inspect the new request.
Unsupported formats and corrupted images are documented causes of image-loading failures. Renaming the extension cannot convert the underlying data.
Preserve useful alternative text while debugging
Give an informative image meaningful alt text:
<img src="images/invoice-total.png" alt="Invoice total: $125.00">The text communicates the image’s purpose when loading fails and supports users of assistive technology. Use alt="" only for a genuinely decorative image. An empty alternative can also make a broken decorative image less obvious in a visual browser because the broken-image icon may be hidden; use a temporary diagnostic label if you need to locate the failure, then restore the correct decorative treatment.
Use a layer-by-layer troubleshooting checklist
| Layer | What to inspect | Typical evidence | Fix |
|---|---|---|---|
| URL and deployment | Requested URL, spelling, case, relative directory and deployed files | 404, wrong path, missing asset | Correct src or upload the file to the served directory |
| HTTP response | Status, redirects and response body | 403, 404, 5xx, login page or HTML error with 200 | Repair routing, permissions, authentication or hosting |
| MIME type | Content-Type header |
Not image/png |
Configure static serving or storage metadata |
| Responsive selection | Selected srcset candidate and sizes |
Only one candidate fails | Fix generated URLs, files or sizing rules |
| Cross-origin policy | Console errors and CORS response headers | Blocked CORS request after adding crossorigin |
Remove unnecessary attribute or grant the requesting origin |
| File integrity | Actual bytes and ability to open the file | Corrupt, truncated or mislabeled content | Re-export, replace and redeploy the PNG |
Common symptoms and precise fixes
The image icon appears, but the URL is wrong
Inspect the requested URL rather than the text in your source file. Correct directory, filename and capitalization, then redeploy any missing asset.
The request is 200 but the image is blank
Read the response headers and body. A successful status can still contain HTML, JSON or invalid bytes. Return the actual PNG and send Content-Type: image/png.
The page works locally but not in production
Check the production URL directly and verify that the build copied the image. Case sensitivity, a different base path, ignored assets and CDN deployment are common differences between environments.
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Only some screen sizes fail
Inspect the selected srcset candidate at the failing viewport. Repair that candidate or temporarily remove responsive attributes to isolate it.
The Console reports a CORS error
Look for an unnecessary crossorigin attribute. Remove it for ordinary display, or configure the remote image server to allow the page origin when script access to the pixels is required.
The file opens in an editor but not in the browser
Compare the deployed bytes and headers. The deployment may have truncated the file, transformed it into another format, or served a cached error response. Replace the asset and verify the new Network response.
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FAQ
Does adding a leading slash always fix a broken image?
No. A leading slash changes resolution to the site root; it helps only when the file is actually served there. Confirm the exact requested URL in Network tools.
Can CSS make a missing PNG display?
No. CSS can affect sizing and visibility, but it cannot repair a missing response, incorrect MIME type or corrupt image bytes. First establish that the request returns a valid image.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minutePC Slower Than It Used to Be?
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 & 11Should I use alt text as a workaround?
No. Alternative text communicates meaning when the image is unavailable; it does not load or repair the image. Keep informative alt text while fixing the underlying request.
Frequently Asked Questions
Does adding a leading slash always fix a broken image?
No. A leading slash changes resolution to the site root; it helps only when the file is actually served there. Confirm the exact requested URL in Network tools.
Can CSS make a missing PNG display?
No. CSS can affect sizing and visibility, but it cannot repair a missing response, incorrect MIME type or corrupt image bytes. First establish that the request returns a valid image.
Should I use alt text as a workaround?
No. Alternative text communicates meaning when the image is unavailable; it does not load or repair the image. Keep informative alt text while fixing the underlying request.
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