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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteA link preview generator fetches a URL and shows the title, description, image, domain and metadata that a social or messaging service may use for its share card. Use one to check a page before publishing, then confirm important changes with the platform’s own debugger because simulators cannot guarantee an identical live card or cache state.
What a link preview generator actually checks
When someone shares a URL, the receiving service retrieves that page and looks for metadata in the HTML document’s <head>. The Open Graph protocol describes its purpose as enabling “any web page to become a rich object in a social graph.” A generator performs a similar fetch and presents the values it finds, often with a visual mock-up.
| Input | What it controls | Typical Open Graph tag |
|---|---|---|
| Page title | Headline shown in the card | og:title |
| Summary | Supporting description | og:description |
| Image URL | Preview artwork | og:image |
| Canonical share URL | URL associated with the object | og:url |
| Object type | Content classification, such as an article or website | og:type |
| Domain and favicon | Source identity in a checker or application | Usually derived from the URL or HTML |
A checker may also show ordinary HTML title and description values when Open Graph data is missing. That fallback is vendor-specific; social platforms do not all implement fallbacks in exactly the same way.
Choose the right workflow
| Your need | Best route | Check before adopting it |
|---|---|---|
| One page before sharing | Manual preview checker | Which platforms it simulates, fields it displays, and whether it flags missing tags |
| Preview data inside an app | Link-preview API | Response fields, HTML fallbacks, redirect handling, rate limits, price and reliability |
| Find problems across your site | Site audit or crawler | Crawl scope, issue reports, exports and CMS workflow |
| Prove how the page visually renders | Browser screenshot service | JavaScript execution, cookie banners, popups, cache behavior and failure reporting |
A manual checker is quickest for an occasional URL. An API is appropriate when your application must retrieve title, description, image, domain, favicon and fallback data repeatedly. A screenshot is complementary: it shows the rendered page, not necessarily the card a platform will generate from metadata.
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How to inspect a URL manually
- Publish or stage the page at its final URL. Test the HTTPS URL that people will share, including its path and query string. Redirects can cause a checker to inspect a different document than the one you edited.
- Open a link-preview checker. Paste the URL and run a fetch. Record the title, description, image, resolved domain and the raw Open Graph fields it reports.
- Compare the report with the page source. In a browser, use View Source and search for
og:title,og:description,og:image,og:urlandog:type. They should be in the document head, not injected only after a client-side script runs. - Open the image URL directly. Confirm it returns an image over HTTPS without an authentication wall, redirect loop or hotlink restriction. Check that the image is the intended artwork and that its file is not accidentally an HTML error page.
- Fix the source, then fetch again. A checker can cache a previous response. Change the page or use its refresh option before concluding that a correction failed.
- Verify high-stakes shares with the platform’s current debugger. A simulator can reveal malformed or absent fields, but it does not establish how every platform’s live renderer and cache will behave.
Minimum HTML to add to a page
Place the core tags in the <head> of the server-rendered HTML. Replace the example values with the page’s own canonical data.
<head>
<title>Example article title</title>
<meta name="description" content="A concise summary of the page.">
<meta property="og:title" content="Example article title">
<meta property="og:description" content="A concise summary of the page.">
<meta property="og:image" content="https://example.com/images/article-card.jpg">
<meta property="og:url" content="https://example.com/articles/example">
<meta property="og:type" content="article">
</head>- Use an absolute, publicly reachable URL for
og:imageandog:url. - Keep the values specific to the page. Do not give every article the home page’s title, description or image.
- Emit one authoritative value for each property. Duplicate tags can make parsers choose an unexpected value.
- Keep metadata in the initial response when possible. A crawler that does not execute your client-side JavaScript may never see tags added after load.
- Use a canonical URL that matches the URL you intend people to share. If tracking parameters are needed, decide deliberately whether they belong in
og:url.
The protocol defines the fields, not a universal image size or character limit. Platform-specific dimensions, truncation and cropping rules change, so do not treat one “ideal” number as valid everywhere.
Debugging missing or wrong preview data
The checker shows an old title or image
Inspect the current source, then refresh the checker and the platform debugger. A cached fetch may outlive your edit. If the old value remains in source, fix the CMS template or the page record rather than repeatedly clearing a preview.
The image is blank, broken or unrelated
Request the exact og:image URL in a private browser window. Fix non-HTTPS URLs, access controls, redirects, unsupported responses and incorrect content types. Make sure the image tag is not being overwritten by a second tag later in the head.
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Confirm spelling and quoting in the HTML, and verify that the tags are inside <head>. If your framework renders metadata only on the client, configure server-side or static rendering. An API may fall back to the ordinary HTML <title> and description, but that behavior belongs to that API and should not be assumed for every platform.
The checker cannot fetch the URL
Test DNS, TLS and the redirect chain. Check that the site does not require a login, block all non-browser user agents, or return a timeout to data-center addresses. Review firewall, WAF and robots policies with your hosting provider; do not weaken security globally just to make a preview fetch succeed.
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The preview differs between services
Each service can fetch at a different time, cache independently and apply its own cropping or truncation. Compare the raw metadata first. If it is correct, use the affected platform’s debugger and current publishing guidance rather than changing valid tags solely to match a simulator.
Redirects produce the wrong page
Follow every redirect and inspect the final response. Set metadata on the final destination, use a consistent canonical URL, and avoid redirecting crawlers to a consent or login wall.
Using a link-preview API in an application
An API saves you from writing URL fetching, HTML parsing and fallback logic. A vendor-described link-preview API returns title, description, preview image, domain, favicon, Open Graph metadata and fallback data. Before integrating any provider, ask:
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- Does it return the final URL after redirects as well as the requested URL?
- Are missing Open Graph fields filled from standard HTML, and are those fallbacks labeled?
- How are timeouts, bot checks, malformed HTML and private URLs represented?
- What are the request limits, retention rules, regional restrictions and current prices?
- Can you cache a response and invalidate it when a page changes?
Keep untrusted fields escaped when inserting them into your own UI. Validate that an image URL uses an allowed scheme, enforce outbound request timeouts, and protect an endpoint that accepts arbitrary URLs against server-side request forgery. Never let a user-supplied URL reach internal network ranges or cloud metadata endpoints.
// Illustrative response shape; use the fields documented by your provider.
{
"url": "https://example.com/articles/example",
"title": "Example article title",
"description": "A concise summary of the page.",
"image": "https://example.com/images/article-card.jpg",
"domain": "example.com",
"favicon": "https://example.com/favicon.ico",
"openGraph": {
"title": "Example article title",
"description": "A concise summary of the page.",
"image": "https://example.com/images/article-card.jpg",
"url": "https://example.com/articles/example",
"type": "article"
}
}One vendor advertises a free allowance of 100 requests per month; that limit and all other vendor pricing are subject to change, so verify the provider’s current API page before committing. For a small site, cache successful results by normalized URL and refresh them on demand. For a busy service, record latency, status, redirect count and parser errors without logging credentials or private page contents.
Performance, reliability and privacy considerations
- Fetch cost: A preview request can trigger redirects, HTML parsing and an image request. Set a finite timeout and cap response sizes.
- Freshness: Cache by canonical URL, but provide a refresh path when an editor changes metadata. Distinguish a cache hit from a newly fetched result in logs.
- Availability: Treat preview enrichment as optional. Render the user’s pasted URL immediately and fill in metadata asynchronously; a third-party timeout should not break your core workflow.
- Security: Restrict protocols to HTTP and HTTPS, block private address ranges, and sanitize returned HTML before displaying it.
- Privacy: A provider can see every URL you submit. Avoid sending private links unless the service’s retention and access terms meet your requirements.
- Rendering versus metadata: A screenshot proves what a browser displayed. It does not prove that a social crawler accepted a particular Open Graph value.
Or skip the browser setup
If you need a rendered image of a page as well as metadata inspection, ScreenshotNeo provides a website screenshot API and MCP server. It accepts consent banners before capture and removes more than 60 known consent platforms, newsletter popups and chat widgets; each step can be disabled. Only clean shots are billed: bot checks or CAPTCHAs, blank pages, timeouts, failed loads and cache hits are free, and response headers identify the page verdict and billing result.
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One GET request returns PNG, JPEG, WebP or PDF. The API supports full-page captures with lazy images loaded, CSS-selector element captures, dark mode, 12 device presets plus custom viewports, retina scale, PDF paper settings and page ranges, custom CSS and JavaScript, clicks, selector or network-idle waits, request and resource blocking, headers, cookies, user agents, authorization, timezone, geolocation, transparent backgrounds, resizing, chosen cache TTLs, signed image links, asynchronous jobs with signed webhooks, bulk capture of up to 100 URLs per call, a usage API and an OpenAPI specification. Parameter names used by other screenshot APIs also work for easier migration. Its MCP tools—take_screenshot, get_page_info and capture_pdf—can be called by Claude, Cursor or another MCP client.
cURL (see the ScreenshotNeo API documentation):
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpPython:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);The Free plan includes 1,000 shots each month with no card. Paid plans start at $5 for 3,000 shots; every feature is included on every plan, and yearly billing gives two months free. Create a free ScreenshotNeo account to try it without a card.
FAQ
Can a generator guarantee what Facebook, LinkedIn or X will display?
No. It can show the metadata a fetch returned and simulate surfaces, but each platform controls its own parser, cache, crop and truncation. Use the relevant platform debugger when the exact live result matters.
Should I put Open Graph tags in the body?
No. Put the basic tags in the document head so crawlers can read them from the initial HTML response.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsIs a screenshot a replacement for Open Graph metadata?
No. A screenshot records visual rendering; Open Graph metadata supplies structured values that sharing services use to build a card. Use both when you need to inspect appearance and machine-readable data.
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