How to test your link preview before you share it anywhere

Do not debug your link preview live in front of an audience. The moment you announce your launch is the moment the most people will ever paste and see your link at once, and discovering then that it renders as a bare URL or a broken image is the worst possible time. Test it first. Here is how to preview the card, the caching gotcha that makes a fixed card still look broken, and the checklist to run before you post anywhere.

01 · See the card firstPreview it before you post

You can see exactly how your card will render without sharing it publicly. Two approaches:

• Link-preview tools. Paste your URL into a third-party Open Graph or X card preview tool. It fetches your Open Graph and twitter: tags and renders the card as it will appear across platforms, flagging anything missing.
• The Facebook Sharing Debugger. It reads your OG tags, shows the card, lists warnings, and, crucially, lets you force a fresh scrape.

For a real-world test, paste your link into a private Slack or Discord channel and look at the actual card the platform draws. It is the truest preview there is, and nobody sees it but you.

02 · Why a fixed card still looks brokenThe caching gotcha

This is the part that wastes an afternoon if you do not know it. Platforms scrape your tags once and cache the result, so after you correct your Open Graph tags, the old, broken card can keep appearing because the platform is serving its cached version, not re-reading your page.

The fix is to force a re-scrape. The Facebook Sharing Debugger has a “Scrape Again” button, and most preview tools offer a refresh. If the problem is specifically the image, change its URL, for example og.png?v=2, because platforms cache by image URL and will treat a new URL as a new image. Re-scrape after every change until the preview shows what you expect.

03 · Four things to confirmThe pre-launch checklist

Run this once before you share your launch anywhere:

1. The card renders fully, with a title, description, and image, not a bare URL.
2. The image loads and is correct: an absolute HTTPS URL, sized 1200x630.
3. The tags are in your server-rendered HTML, so scrapers that do not run JavaScript can see them.
4. You have re-scraped, so no stale cache is showing an old version.

Tick those four and your link will look like a real product the moment it matters most, which is the entire point of getting your Findable signals right before launch rather than after.