The Tool Desk
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How the CaptureKit workflow works
CaptureKit’s documented endpoint is GET https://api.capturekit.dev/v1/capture. It needs a webpage URL and an API key sent in the x-api-key header. Each capture call is listed as one credit. The endpoint captures rendered webpage content, so your app must first render the card’s text and visuals into a page the service can request. See the Screenshot API reference and CaptureKit’s Open Graph images and social media previews use case.
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- Create a branded HTML template with the article or product title, optional author or category, a short excerpt, and visual elements such as a logo or background.
- Render the template at a stable URL accessible to CaptureKit, such as
https://example.com/social-card/my-article. Do not put secrets or private content in a URL the capture service can request. - Request a screenshot from your backend or trusted automation environment.
- Store the returned image and serve it at a stable, publicly fetchable URL.
- Set that final image URL in the page being shared, along with the page’s other Open Graph properties.
- Trigger generation when the content is published, then save the image URL with the content record.
The social-card page being captured and the destination page being shared have different jobs: one renders the image, while the other advertises that image to social consumers.
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Design the template for the dimensions you intend to request. CaptureKit’s viewport defaults to 1280 by 1024 pixels; set width and height explicitly if your layout uses another canvas. A 1200 by 630 pixel canvas is used in the request below as an example, not as a universal platform requirement. CaptureKit advises optimizing dimensions for the target social platforms but does not prescribe one size for all of them.
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Keep text legible at the final size, allow room around the edges, and avoid relying on content that appears only after user interaction. If the page uses client-side rendering, fonts, or images that load asynchronously, choose a documented readiness option—such as wait_until, wait_for_selector, or delay—when needed. The API exposes these controls, but their behavior is not guaranteed for every site or framework.
Call the Screenshot API from a trusted environment
Keep the key in a server-side secret store or environment variable. CaptureKit warns against calling the endpoint directly from browser code or a mobile app because that can expose the key. The request below uses the current reference’s x-api-key header and requests a PNG at a 1200 by 630 viewport.
curl --get 'https://api.capturekit.dev/v1/capture'
--header "x-api-key: ${CAPTUREKIT_API_KEY}"
--data-urlencode 'url=https://example.com/social-card/my-article'
--data-urlencode 'format=png'
--data-urlencode 'viewport_width=1200'
--data-urlencode 'viewport_height=630'For this command, set CAPTUREKIT_API_KEY in the shell environment and replace the example URL with your reachable template route. The response is the captured asset; save it to storage your site can serve publicly. CaptureKit also documents optional S3-compatible storage settings in its API reference.
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format: PNG is the documented default; supported outputs include PNG, JPEG/JPG, WebP, and PDF. For an OG image, request an image format rather than PDF.viewport_widthandviewport_height: explicitly match the template’s intended canvas instead of relying on the 1280 by 1024 default.scale_factor: controls capture scale and defaults to 1.image_quality: available for JPEG or WebP output.delay,wait_until, andwait_for_selector: use as appropriate when the page needs time or a particular element before capture.- Cache controls: choose them according to how often the rendered card changes; avoid serving an old capture after changing the content.
Check the endpoint reference for current parameter names and accepted values before deploying automation, since API details can change.
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Publish the image and add Open Graph metadata
Once the capture is saved, make its URL reachable without authentication and use the exact final URL in the destination page’s head. The Open Graph protocol specifies og:title, og:type, og:image, and og:url as basic required metadata. It also defines image properties for dimensions, MIME type, secure URL, and alternative text. See the Open Graph protocol.
<meta property="og:title" content="A useful article title">
<meta property="og:type" content="article">
<meta property="og:url" content="https://example.com/articles/my-article">
<meta property="og:image" content="https://cdn.example.com/og/my-article.png">
<meta property="og:image:alt" content="A branded preview card for the article">Replace the example values with the actual canonical destination URL and final image URL. Add image width, height, and MIME-type metadata when those values are known. Use alternative text that describes the image for people who cannot see it.
Automate generation when content is published
For a blog, product catalog, event listing, or news site, trigger the render-and-capture workflow after the item becomes available. Store the resulting image URL alongside that item so the page renderer can emit the correct og:image. This avoids manually capturing each card and helps ensure metadata points to the generated asset rather than a temporary preview route.
You can run the job synchronously during publishing or enqueue it as a publish-triggered task. A synchronous path is straightforward but makes publication wait for capture; a background job lets publishing complete separately, but your system needs to handle the interval before the image and metadata are ready. CaptureKit’s use-case page describes automatically generated images for newly published content; select the workflow that fits your own publishing process.
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Check usage and cost
CaptureKit lists one credit per capture call. Its pricing page, reviewed October 3, 2026, lists 100 free credits, then monthly plans of $7 for 1,000 credits, $29 for 10,000 credits, and $89 for 50,000 credits. These are the listed terms as of that review date; confirm current prices and plan details on the CaptureKit pricing page before budgeting.
Successful calls consume credits, and CaptureKit provides dashboard logs. Its documentation describes /v1/usage as a way to confirm authentication and usage. Monitor usage if you generate cards in bulk or regenerate them whenever content changes.
Troubleshoot common problems
Authentication fails
Use the x-api-key request header shown in the current endpoint reference and confirm that the environment variable is set. Do not copy older migration examples that use a query parameter without checking the current reference: the February 19, 2026 migration announcement shows a different style, but the live endpoint reference specifies the header.
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Confirm the template URL is reachable by the CaptureKit service and renders the expected content without a login or local-only network access. If rendering is delayed, try the documented wait_until, wait_for_selector, or delay controls. Verify fonts, images, and client-rendered content are available before capture.
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The crop or layout is wrong
Set viewport width and height to the exact canvas your template expects. The default is 1280 by 1024, which may not match a social-card design. Check the saved output itself rather than assuming the requested dimensions produced the layout you intended.
The format or quality is unsuitable
PNG is the documented default. For JPEG or WebP, set image_quality as needed, then inspect the returned file and verify it works in the destination page and the social platform that consumes it.
The social preview still shows an old image
Check that the shared page now emits the intended og:image URL and that the URL serves the new image. Social consumers may cache metadata or images; the reviewed CaptureKit and protocol materials do not establish platform-specific cache durations or guarantee an immediate refresh.
The API key is exposed
Remove it from client-side JavaScript or a mobile app and rotate it if it has been made public. Make the request from a backend or trusted automation service instead.
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Or skip the browser setup
ScreenshotNeo accepts a URL in one GET request and returns a screenshot; see the ScreenshotNeo API documentation for options and setup. For example, this saves a WebP capture of the rendered social-card route:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com/social-card/my-article -o shot.webpScreenshotNeo removes cookie banners, newsletter popups, and chat widgets before the shot; those steps can be turned off. Bot checks, blank pages, and failed loads are never billed, and responses say which verdict and billing status applied. Its MCP server lets AI agents use take_screenshot, get_page_info, and capture_pdf. The Free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Features are available on every plan. Sign up for ScreenshotNeo free.
Frequently Asked Questions
Does CaptureKit create an image directly from an Open Graph title and description?
No. Its documented capture endpoint takes a webpage URL, so render the card in a reachable HTML page first.
Can I request a PDF from CaptureKit?
The API reference lists PDF as a supported output, alongside PNG, JPEG/JPG, and WebP. For a social preview, use an image output.
Will a new social image appear immediately after I update it?
Not necessarily. The shared page must emit the updated image URL, and social platforms may cache previews; the reviewed sources do not specify their cache durations.
Quick Recap
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