Choose the picture you plan to use as your og:image and this checker reads its width, height, ratio, file size and format on your device. It then compares them with the limits Facebook, LinkedIn and WhatsApp publish, and shows how wide and square crops would cut it.
| Platform | Pixels | Ratio | File size |
|---|---|---|---|
| At least 1200 x 630 for best display; 200 x 200 minimum | Close to 1.91:1 | Up to 8MB | |
| Minimum 1200 x 627 | 1.91:1 recommended | Max 5MB | |
| At least 300px wide | 4:1 or less | Under 600KB |
Updated
The share image is the first thing people see when your page is posted in a group, a feed or a chat, and each platform quietly rejects or shrinks images that break its rules. Instead of guessing, drop your file in here. The browser reads it locally, so a private product photo never leaves your computer.
Your image stays on this device. Nothing is uploaded.
After checking the file, add its real numbers to your page head. The checker fills these in for your own image.
Width and height are optional in the protocol; alt is something ogp.me says a page should give whenever it sets og:image.
<meta property="og:image" content="https://example.com/share/spring-sale-v2.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="Spring sale banner with three pairs of trainers">A fail on the recommended size is not a broken share. Facebook still accepts images down to 200 x 200, but it uses a smaller layout, and the image may look soft on large screens.
File size matters most for WhatsApp. Its 600KB limit is far stricter than Facebook's 8MB or LinkedIn's 5MB, so a photo exported straight from a phone often fails it.
Meta caches share images by their address, so upload a replacement under a new file name and update the og:image tag. Posts already published keep their old picture.
Then paste your page into the Open Graph preview tool to confirm the tags point at the new file.
1200 x 630 pixels is the safe choice. Meta recommends at least 1200 x 630 for high resolution screens, and LinkedIn asks for at least 1200 x 627 at a 1.91:1 ratio.
No. The protocol at ogp.me only defines optional og:image:width and og:image:height tags for the number of pixels wide and high. The sizes come from each platform's own guidance.
No. The file is read with your browser's own file APIs and a temporary local address, then measured on your device. Closing the tab discards it.
This page checks the file. A share can still fail when the og:image tag is missing, points to a relative path, or the image sits behind a login. LinkedIn's help names a website blocking its crawler as one cause.
It is width divided by height. 1200 divided by 630 is about 1.90, close enough to sit within the wide frame most feeds use without visible cropping.
Related: OG image generator, Open Graph preview, Website image sizes, WhatsApp link preview guide, Social media image sizes.
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