How to use it
- Type the Title, Description and Picture address of the link, and the Page address (og:url).
- Choose the Twitter card type (twitter:card), and type a Site name (og:site_name) if you have one.
- Or paste the meta lines of a page into the paste box and click Read the pasted tags to fill the form.
- Read the six link cards and the warnings under them, then click Copy or Download to take the Head tags.
Which tags a link card reads
The Open Graph protocol lists og:title, og:type, og:image and og:url as its required properties; og:description and og:site_name are optional. The tool always writes og:type as website, because it is the one required value the form does not ask for.
- The LinkedIn Help Center says its share box takes the title, description and image from oEmbed and/or Open Graph markup.
- Slack's guide says Slack looks for common Open Graph and X (formerly Twitter) Card metadata.
- Facebook recommends an image of at least 1200 x 630 pixels, and advises keeping it close to a 1.91:1 aspect ratio.
Picture sizes and what the tool checks
Facebook's sharing guidance recommends at least 1200 x 630 pixels and says the file must not exceed 8 MB. The tool can read the size of a picture only when you choose it on this device, because a typed address is not loaded.
A chosen picture is checked against 1200 x 630 pixels and noted when it differs. The tags then need the picture's address on the internet, which you type in Picture address.
Pasting the tags of a page
When you paste the meta lines of a page, the form is filled from them. The tool reads only og: and twitter: tags, and an og: value wins over a twitter: value for the same field. The pasted text is read in a separate document and is never placed on this page.
What the link cards are
Each card is a generic layout in the general shape of a link card: a picture on top, a picture at the side, a chat bubble, or a block with a bar. The colours are neutral and no logo is shown. The cards are not copies of any service's card. Where this page describes what a service does, it cites that service's own page.
Worked example: a page with a 1200 x 630 picture
The title is Compound Interest Calculator (28 characters) and the description is Calculate how savings grow with monthly deposits. The page address is https://example.com/compound-interest-calculator, the picture address is https://example.com/images/compound-interest-1200x630.png, the site name is FireToolLand and the card type is summary_large_image.
The head tags are og:type, og:title, og:description, og:image, og:url, og:site_name and twitter:card: seven lines. No note appears, because the title is under the guide length, the picture and page addresses are https, and a card type is set.
| Tag | Value |
|---|---|
| og:type | website |
| og:title | Compound Interest Calculator |
| og:site_name | FireToolLand |
| twitter:card | summary_large_image |
Frequently asked questions
Why does the preview show a frame instead of my picture?
A picture address you type is not loaded, because loading it would send a request from this page to that address. The frame shows the address as text. Choose a picture from your device to see it here.
Is my picture uploaded when I choose it?
No. The picture is shown with a local address that stays in your browser, and the address is released when you choose another picture. The picture is never uploaded and is not written into the tags.
Why should the addresses in the tags be full https addresses?
A link card is built from the address of the page and the address of its picture. The og:url tag is the canonical URL of the object, so it should be the full https address of the page.
Do the cards show exactly what each service displays?
No. The six cards are generic layouts. Services change their cards and may keep a page's tags in a cache, so check the real result on the service itself.
Does the tool check the title length exactly?
No. ogp.me sets no maximum length for og:title. The 60 character note is a rough guide that this tool chose, and a service may show a different length.
Sources
- The Open Graph protocol
- Facebook for Developers: images for sharing
- LinkedIn Help: troubleshooting issues sharing URLs
- Slack: unfurling links in messages
Figures and text last checked on Tuesday, November 10, 2026.