To show an image in a Slack preview for your website, add an Open Graph og:image tag to the page’s HTML <head>, using the full URL of the image you want Slack to display. Slack’s classic link unfurling crawls shared URLs and looks for Open Graph and X Card metadata. Make sure the Slack message contains the full page URL, including https:// or http://.
Add Open Graph metadata to the page
Put the metadata in the HTML document’s <head> for the exact page people will share. The Open Graph Protocol identifies og:title, og:type, og:image, and og:url as its basic properties. It also describes og:description as optional and recommends og:image:alt when you specify an image.
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<head>
<meta property="og:title" content="Page title">
<meta property="og:type" content="website">
<meta property="og:url" content="https://example.com/page">
<meta property="og:image" content="https://example.com/images/page-preview.jpg">
<meta property="og:image:alt" content="Description of the preview image">
<meta property="og:description" content="A short description of this page.">
</head>Replace the example values with the page’s real title, canonical URL, image URL, and description. The image URL should point directly to the intended image; the page URL in og:url should identify the page being shared. The metadata should be present in the HTML head Slack fetches, not only added after the page renders in a browser.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteThe snippet follows the Open Graph Protocol’s field definitions; it does not guarantee a particular Slack card layout or establish Slack-specific image dimensions or file limits. See the Open Graph Protocol for property details.
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- The built-in noise-reducing mic makes sure your voice comes across clearly up to 1.5 meters away, even if you’re in busy surroundings.
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- The adjustable universal clip lets you attach the camera securely to your screen or laptop, or fold the clip and set the webcam on a shelf. You’re always ready for your next video call.
Share a fully qualified page URL
In Slack, share the page address with its protocol, such as https://example.com/page. Slack’s documented classic unfurling flow applies to links it spots in messages and crawls to generate a preview. A bare domain or relative path is not the fully qualified link described in Slack’s guidance. Read Slack’s link unfurling documentation for its description of classic previews.
Diagnose a Slack link preview image that is not showing
- Inspect the HTML for the exact shared URL. Confirm the response’s document head contains the intended
og:imagetag. Check the page source or the HTML response your server returns, rather than relying only on what appears after client-side rendering. - Verify the image and page values. Confirm
og:imagepoints to the image you mean to use and that the page also providesog:title,og:type, andog:url. - Check the Slack message. Ensure it includes the full URL with
http://orhttps://. - Check for a Slack app handling that domain. If an app has a link handler for the domain, custom app unfurling may be involved; otherwise, Slack documents classic crawling as the fallback.
- Inspect your server and image resource if the tag is correct. Review whether the page and image can be fetched and served as expected. The cited Slack and Open Graph documentation does not establish a specific timeout, cache-refresh interval, or Slack image-file restriction to use as a fixed diagnostic rule.
Slack’s official documentation reviewed here does not specify a fixed cache expiration time for classic website previews, nor does it provide an official preview debugger. If you have just changed metadata, do not assume that a particular waiting period or refresh mechanism is guaranteed by these sources.
Rank #2
- Compatible with Nintendo Switch 2’s new GameChat mode
- Auto-Light Balance: RightLight boosts brightness by up to 50%, reducing shadows so you look your best—compared to previous-generation Logitech webcams (1)
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Classic previews and custom Slack app unfurling are different
| Approach | When it applies | What it requires |
|---|---|---|
| Classic link unfurling | Ordinary website pages that need a standard preview | Slack crawls the shared URL and looks for common Open Graph and X Card metadata. |
| Slack app unfurling | A developer wants custom content or interaction for a domain associated with an app | An app receives a link_shared event and uses Slack’s API and required scopes to attach a custom unfurl. |
For custom unfurling, Slack documents the chat.unfurl API and the links:write scope. Its API reference says a preview field is ignored when supplied for an unfurl to a message that has already been posted, so this API is not a way to force an ordinary classic image preview. See Slack’s chat.unfurl method.
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ScreenshotNeo is a website screenshot API and MCP server, not a replacement for adding Open Graph metadata when you want Slack itself to show a preview card. It can capture a page directly if your workflow needs a screenshot file. One GET request returns an image or PDF; here is the cURL form:
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- Built-in 2 Omnidirectional Mics - EMEET webcam with microphone for desktop features 2 built-in omnidirectional microphones, picking up your voice to create clear audio for communication. When installing the webcam, select EMEET C960 as the default microphone input device in your computer and video applications and select C960 as the default device in Zoom/Teams and ensure microphone permissions are enabled for proper use. Please note that C960 does not include built-in speakers.
- Automatic Light Adjustment - Automatic exposure adjustment is applied in EMEET HD webcam 1080p so that the streaming webcam can deliver stable image performance. EMEET C960 camera for computer also features color adjustment and exposure optimization to help you look your best. For optimal video quality, it is recommended to use the webcam in normal or well-lit environments and select suitable video settings in your application. Proper lighting helps achieve a clearer and more balanced image.
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- High Compatibility & Multi Application - C960 webcam for laptop is compatible with Windows 10/11, macOS 10.14+, and Android TV 7.0+. Not supported: Windows Hello, TVs, tablets, or game consoles. It works with Zoom, Teams, Facetime, Google Meet, YouTube and more. Please select C960 webcam as the default camera and microphone device in your application and ensure camera/microphone permissions are enabled, especially on macOS. (Tips: Incompatible with Windows Hello)
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com/page -o shot.webpSee the ScreenshotNeo API documentation for request options. ScreenshotNeo accepts cookie or consent banners and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; those steps can be turned off. Bot checks, blank pages, timeouts, failed loads, and cache hits cost nothing, and the response says which page verdict applied and whether it was billed. Its MCP server lets AI agents use take_screenshot, get_page_info, and capture_pdf. The Free plan includes 1,000 shots per month without a card; paid plans start at $5 for 3,000 shots.
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Quick Recap
Rank #4
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