Free tool · link previews

See how your link looks in WhatsApp, iMessage and Google Messages

Works, and 2 things could be betterWorth a look: og:image:type, og:image:width and height.14 pass2 worth a look

Previews

Drawn after how each app showed a link in October 2026; each changes its look from time to time. An app may keep the card it drew first: LinkedIn's Post Inspector and Facebook's Sharing Debugger fetch it again.

In a phone

Where links are sent most: each drawn as the app shows a link in a conversation.

**iMessage**title and domain, no description

**Google Messages**the card above the link

Diagnosis

Open Graph

Passes: og:title61 characters

Passes: og:description186 characters

Passes: og:imageset

Passes: og:image is a whole addresshttps://…

Passes: The image's size1200 × 630

Worth a look: og:image:typenot set

Says the image's type before it is fetched; Facebook and LinkedIn read it.

Put in the page's head

<meta property="og:image:type" content="image/jpeg">

Worth a look: og:image:width and heightnot set

Let Facebook draw the card at once, before the image is fetched.

Put in the page's head

<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">

Passes: og:urlhttps://github.com/

Passes: og:typeobject

Passes: og:site_nameGitHub

For X

Passes: twitter:cardsummary_large_image

Passes: An image for Xtwitter:image

Can they reach it

Passes: Asked as Facebook's crawler200 OK

Passes: Asked as WhatsApp200 OK

Passes: Tags in the HTMLnot added by a script

Passes: A faviconnamed in the page

Every tag, as found10

Tag	What it says	State	Who reads it
The card
`og:title`	GitHub · Change is constant. GitHub keeps you ahead. · GitHub	Found	61 characters. Every app shows it.
`og:description`	Join the world's most widely adopted, AI-powered developer platform where millions of developers, businesses, and the largest open source community build software that advances humanity.	Found	186 characters.
`og:image`	https://images.ctfassets.net/8aevphvgewt8/76epZKB2wF998m4e4bLLXn/c505f20b00ec70b88b1be5aec42c4be4/OG_image.jpg	Found	1200 × 630, JPEG, 126.6 KB: the 1.91 : 1 drawn large.
`og:image:alt`	Join the world's most widely adopted, AI-powered developer platform where millions of developers, businesses, and the largest open source community build software that advances humanity.	Found	Read aloud to whoever cannot see the image.
`og:url`	https://github.com/	Found	The same as the page's canonical address.
`og:site_name`	GitHub	Found	Slack, Discord and Facebook show it above the title.
For X
`twitter:card`	summary_large_image	Found	The large card.
`twitter:title`	GitHub · Change is constant. GitHub keeps you ahead. · GitHub	Found
`twitter:description`	Join the world's most widely adopted, AI-powered developer platform where millions of developers, businesses, and the largest open source community build software that advances humanity.	Found
`twitter:image`	https://images.ctfassets.net/8aevphvgewt8/76epZKB2wF998m4e4bLLXn/c505f20b00ec70b88b1be5aec42c4be4/OG_image.jpg	Found

HTML

As found

<meta property="og:title" content="GitHub · Change is constant. GitHub keeps you ahead. · GitHub">
<meta property="og:description" content="Join the world's most widely adopted, AI-powered developer platform where millions of developers, businesses, and the largest open source community build software that advances humanity.">
<meta property="og:image" content="https://images.ctfassets.net/8aevphvgewt8/76epZKB2wF998m4e4bLLXn/c505f20b00ec70b88b1be5aec42c4be4/OG_image.jpg">
<meta property="og:image:alt" content="Join the world's most widely adopted, AI-powered developer platform where millions of developers, businesses, and the largest open source community build software that advances humanity.">
<meta property="og:url" content="https://github.com/">
<meta property="og:type" content="object">
<meta property="og:site_name" content="GitHub">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:image" content="https://images.ctfassets.net/8aevphvgewt8/76epZKB2wF998m4e4bLLXn/c505f20b00ec70b88b1be5aec42c4be4/OG_image.jpg">

With the fixes

<meta property="og:title" content="GitHub · Change is constant. GitHub keeps you ahead. · GitHub">
<meta property="og:description" content="Join the world's most widely adopted, AI-powered developer platform where millions of developers, businesses…">
<meta property="og:image" content="https://images.ctfassets.net/8aevphvgewt8/76epZKB2wF998m4e4bLLXn/c505f20b00ec70b88b1be5aec42c4be4/OG_image.jpg">
<meta property="og:image:type" content="image/jpeg">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:image:alt" content="Join the world's most widely adopted, AI-powered developer platform where millions of developers, businesses, and the largest open source community build software that advances humanity.">
<meta property="og:url" content="https://github.com/">
<meta property="og:type" content="object">
<meta property="og:site_name" content="GitHub">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:image" content="https://images.ctfassets.net/8aevphvgewt8/76epZKB2wF998m4e4bLLXn/c505f20b00ec70b88b1be5aec42c4be4/OG_image.jpg">

Then, who comes from them

When the link is shared, tidekeeper counts who comes from each app, X, LinkedIn, Slack or a newsletter, with no cookie and nothing kept on their device.

How tidekeeper counts →

How it works

Give an addressAny public page. Its HTML is fetched once, and the image it names.
See every app's cardDrawn as WhatsApp, iMessage, Google Messages, X, LinkedIn and the rest draw a shared link.
Fix what is cut or missingEach check that is worth a look says why, with the line to put in the page's head.

Questions

Why does my link show no image in WhatsApp?

WhatsApp draws the og:image only when it can fetch it: the tag must hold a whole https:// address, the image must not be too heavy, and the server must let WhatsApp's fetcher in. The diagnosis checks each of them, and asks the page as WhatsApp does.

How do I see what my link looks like in iMessage?

Give the page's address above: the iMessage card is drawn as it sits in a conversation, with the image, the title and the domain. iMessage shows no description.

What size should an og:image be?

1200 × 630 pixels, a shape of 1.91 to 1, which X, LinkedIn, Facebook and Google Messages draw large. A smaller image is drawn small, or soft.

Why does Facebook or LinkedIn still show an old card?

They keep the card they drew first. Facebook's Sharing Debugger and LinkedIn's Post Inspector fetch the page again.

Do you keep the pages I check?

No. The address is fetched when you ask, and is not kept. No cookie is set and no account is needed.