# Open Graph preview: run it free, or from your agent Estimated Facebook, X, LinkedIn and Slack share cards from your title, description and image, plus the tags. ## Prompt Use looot to check the share preview of [page URL]. 1. Set up https://looot.ai/skill.md. 2. Search the catalog for a web page to markdown endpoint that returns page metadata and check its price before you call. 3. Read the og:title, og:description, og:image and twitter: tags. 4. Return what is missing or too long and a corrected set of tags. ## What it needs A title, description, image URL and site name ## What comes back - Facebook, X, LinkedIn and Slack card previews - og: and twitter: meta tags - warnings for missing or long fields ## Endpoints and providers - context-dev: context-dev-web-scrape-markdown ## What it costs Nothing. The tool on the web page runs in the visitor's browser: no account, no API call and no limit per hour. The prompt above runs the same job from your own looot account with current data, billed per call. ## Before you post See the card a link will make before you share it. ## Fix a bad preview Find the missing image or the title that gets cut. ## New pages Get the og: and twitter: tags for a page in one block. ## Audit live pages Have your agent read the tags of your pages and list what is missing. ## What is an Open Graph preview? It is the card an app shows when someone shares a link: an image, a title, a short description and the domain. Apps build it from the og: tags in the head of the page. ## How do I preview my link on Facebook, X and LinkedIn? Type the title, description and image URL at the top of this page. The cards update as you type. Pick one platform with the buttons to see it alone. ## Is the preview exactly what each app shows? No. It is an estimate of each layout. Apps change their cards, cut text at their own widths and keep old previews in a cache. ## What image size works for Open Graph? 1200 by 630 pixels is the common size and works for Facebook, X large cards and LinkedIn. Use an absolute https URL. ## Why does the old preview still show after I changed my tags? Apps cache previews. Facebook's Sharing Debugger and LinkedIn's Post Inspector can fetch the page again and refresh the card. ## Does this tool read the tags from my live page? No. It shows what you type and makes no request to your page. To check a live page, copy the prompt above into your agent. ## Is this Open Graph preview tool free? Yes. It runs in your browser, needs no account and has no limit. ## Related tools - /free-tools/meta-tag-generator - /free-tools/schema-markup-generator - /free-tools/website-screenshot ## Last reviewed 2026-10-14. ## Agent skill for this page https://looot.ai/free-tools/open-graph-preview/skill.md sets an agent up for exactly the jobs on this page, with the live price of each, and offers the page's starter task once the user has picked a job and seen the price. The line to give an agent is under "Give this to your agent" below. ## For agents ### Give this to your agent ```text set up looot for Open Graph preview - https://looot.ai/free-tools/open-graph-preview/skill.md ```