The Tool Desk
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Test the image in three checks
- Start the app: run your project’s usual development command and open the route you want to test, such as
http://localhost:3000/articles/example. Use the actual route, not just the site home page; route-specific metadata or image files may change the result. - Inspect the document head: open browser developer tools, inspect the page’s rendered HTML, and find
og:image. Confirm that the tag exists and that itscontentvalue points to the image you expect. Next.js’s Metadata APIs create the relevant head tags, which can be inspected in browser developer tools (Next.js Metadata and OG images). - Open the image URL itself: copy the resolved URL from
og:imageand open it in a new tab. Confirm it returns an image rather than an error, and check the visual content, dimensions, and text. For a code-generated image, this directly exercises the image route. You can also request a local URL from a terminal withcurl -i "http://localhost:3000/your-image-path"; replace the example path with the exact URL found in the tag.
If all three checks pass, the local page is emitting a usable image reference and the corresponding local URL serves an image. Keep that result separate from a social-card test: a browser on your computer can reach its own localhost, but a remote social crawler cannot connect to your computer’s loopback address. Use a publicly reachable preview deployment to check crawler behavior.
Choose the Next.js image convention that matches the page
In the App Router, Next.js supports a static image file convention and a code-generated image route. Which to use depends on whether the artwork is fixed or needs to be assembled from code or route data. The official convention reference was checked September 29, 2026, and says it was last updated February 27, 2026 (Open Graph image conventions).
Static image file
Place an opengraph-image.jpg, .jpeg, .png, or .gif in the App Router segment that should use it. Next.js automatically adds the image metadata tags. A file in a more specific, deeper route segment takes precedence over a file in an ancestor segment. That means a page can inherit a broader image and a nested section can supply its own; when the tag points somewhere unexpected, check the route tree before changing unrelated metadata.
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The convention reference lists a maximum file size of 8 MB for an opengraph-image file. It separately lists a 5 MB maximum for twitter-image; do not treat those as the same limit. The docs give 1200 × 630 pixels as a useful example size, not a guarantee that every platform has identical image requirements.
Code-generated image route
For artwork generated in code, add an opengraph-image.js, .ts, or .tsx file to the relevant route segment. The documented convenient generator is ImageResponse from next/og. Next.js uses optional alt, size, and contentType exports to populate matching Open Graph metadata. Inspect the resulting tag and request the resulting image URL just as you would for a static file.
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Generated metadata images are statically optimized and cached by default unless they use Dynamic APIs, uncached data, or dynamic configuration. If an edit appears not to take effect, first establish whether the route’s caching or rendering behavior explains the result; a stale-looking response does not by itself mean the tag is malformed. See the convention reference for the current behavior and conditions.
Check the generated metadata, not only the source code
Source files show what you intended to configure. The rendered document and the image response show what the local app is actually producing. Inspect the exact route under test and verify these items:
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- The tag is present: locate
og:imagein the rendered document head. If it is missing, verify that the metadata file or metadata configuration belongs to the App Router segment for this route. - The URL is the right one: copy the tag’s resolved value rather than guessing the file path. Open it directly and confirm that it serves the intended image.
- The image content is right: check the rendered headline, artwork, colors, and other visible details. For generated images, inspect the route output, not just the component or template that produces it.
- The declared metadata matches: where the generated file exports
alt,size, andcontentType, check those values against the output and the corresponding metadata tags. - The image is suitable for the intended use: check actual dimensions and file size. The Next.js example of 1200 × 630 pixels and its documented file limit are implementation guidance, not a universal promise about every social service’s requirements.
Next.js metadata is not always delivered at the same point in rendering. Depending on prerendering and dynamic behavior, metadata from generateMetadata may be included in initial HTML or streamed later. Next.js says metadata continues to block rendering for HTML-limited crawlers such as facebookexternalhit. For details and implications, see the generateMetadata reference, last updated March 25, 2026 according to the documentation retrieved September 29, 2026.
Test remote crawler behavior on a public preview
A local check answers: “Does my development server produce the tag and serve this image?” It does not answer: “Can a social platform fetch this page and image, and what card will it render?” A remote crawler cannot reach a developer’s machine using its localhost address. Deploy the branch or build to a publicly accessible preview, then use the target platform’s available preview or inspection workflow against that public URL. Vercel’s OG image guide distinguishes opening a local endpoint from deploying to get a publicly accessible path; its example local endpoint is http://localhost:3000/api/og (Vercel OG image guide).
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Test the same route on the preview that you tested locally, and verify that both its page and image URL are publicly reachable. This matters particularly when the image is generated from route data or relies on environment-specific behavior. A local human-browser result alone does not establish what an external crawler will receive. The Next.js metadata reference also documents the distinction between metadata that can stream and blocking behavior for HTML-limited crawlers.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot common failures
No og:image tag appears
- Confirm that the metadata file convention or metadata configuration is in the App Router segment for the route you opened.
- Check the route tree for a more-specific image file that takes precedence over an ancestor’s metadata image.
- Inspect the rendered document head for the exact route rather than assuming that a value in source code was emitted. Next.js metadata APIs generate the head tags, and the browser’s developer tools let you inspect the result.
The tag points to an unexpected image
Read the actual resolved URL in the tag, then open that URL directly. Next.js serves metadata assets and generates file metadata such as the URL, type, and dimensions. A deeper route’s convention file can override an ancestor file, so compare the URL and route placement before editing the image itself.
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The generated image route errors
Request the image URL directly and inspect the development server output. This separates an image-handler failure from a page that merely references the wrong URL. For dynamic route segments, the image handler receives route params; in Next.js 16, params is a promise. Make the handler’s access to those values consistent with that version’s convention.
The generated layout does not match browser CSS
ImageResponse supports common CSS properties and flexbox, but only a subset of CSS; CSS Grid and other advanced layouts are not supported. If a design looks different from the page’s ordinary browser rendering, simplify the layout to supported styles and inspect the image route’s actual output. The Next.js metadata and OG images guide describes the renderer’s constraints.
The browser looks right, but the card is wrong or absent
Move the test to a public preview. Confirm that the crawler can access the page and the image URL, and distinguish the browser’s locally rendered result from the remote fetch. The page’s metadata may be streamed for some requests, while Next.js documents blocking metadata behavior for HTML-limited crawlers; a localhost browser test cannot settle how a particular remote crawler will handle the deployed page.
Or skip the browser setup
For a publicly reachable preview, ScreenshotNeo can capture the page with one GET request. It cannot fetch a URL that is only reachable from your own machine at localhost; deploy a preview first if you want to use it on an unexposed local app. A screenshot can help review the visible page, but it does not replace inspecting the og:image tag or checking how a particular social crawler renders a card.
Quick Recap
Example cURL request for a public preview URL:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://preview.example.com/articles/example -o shot.webpReplace the example URL with your public preview route. The API also has Python and Node.js examples in the ScreenshotNeo documentation. Cookie banners, popups, and chat widgets are removed before the shot; bot checks, blank pages, and failed loads are never billed; an MCP server lets AI agents take screenshots; and 1,000 screenshots a month are free with no card, with paid plans starting at $5 for 3,000. Sign up for the free plan.
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