Use a 1200 × 630 pixel source image for most website link previews. Its approximately 1.91:1 aspect ratio is a practical baseline for Open Graph and X/Twitter-style cards. Keep headlines, faces, logos and product details inside a central safe area, because each service can crop the source differently.
For page metadata, publish og:image together with og:image:width and og:image:height. Add twitter:card=summary_large_image and twitter:image when you want X’s large-card treatment. Create separate, smaller derivatives for thumbnails rendered in your own grids instead of downloading the 1200-pixel image for every small box.
Start with the preview surface
Thumbnail dimensions are not one-size-fits-all. The right source depends on whether an image will represent a page in a social or messaging card, or whether it is a small image inside your own interface.
Social and messaging link cards
Choose 1200 × 630 px as the default source for a page shared as a link. The dimensions produce an aspect ratio of about 1.91:1, which is used by many large link-preview layouts and is also the recommended size in the researched X/Twitter guidance. A source near this ratio generally needs less aggressive cropping than an unusually tall or narrow image.
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This is a compatibility baseline, not a promise that every network will show the same rectangle. A service can select a different card type, reduce the image, or crop a different edge. Treat the 1200 × 630 file as a master preview and design its important content for the center.
Thumbnails inside your own site
If an article list, product grid or search result displays a 320-pixel-wide box, create a derivative for that box rather than sending the full 1200-pixel source on every request. Size the derivative for the rendered box and the device pixel ratio, then test it in the actual responsive layout. This follows Google Search Central’s advice to use responsive image techniques and avoid unnecessary image handling.
The derivative can use a different crop when the component has a fixed shape. Keep the original 1200 × 630 version for sharing metadata so the social preview is not tied to the proportions of one on-page component.
When a square image is appropriate
Use a square derivative only when the target surface is explicitly square, such as a compact avatar-like tile or a grid whose CSS box is square. Do not substitute a square file for the default social source merely because it is easy to generate: a square source gives card renderers more material to crop and can remove the headline or subject at the top and bottom.
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Protect the crop with a safe area
Place the visual subject and every essential word inside a central inset rather than against the outer edge. A practical layout process is:
- Compose the 1200 × 630 canvas with the headline, face, logo or product silhouette near the center.
- Leave visible breathing room on every side; do not let a descender, logo mark or first letter touch the boundary.
- Check a center crop and a reduced mobile-sized rendering. If the message stops making sense when the top or bottom is trimmed, move the critical elements inward.
- Inspect the card in each service where the link will be shared. Platform renderers can choose different card types and crop behavior, so validation is part of the workflow.
A 1.91:1 source reduces the amount of transformation required, but no ratio guarantees identical rendering everywhere. Faces, product edges and text need more protection than decorative background material.
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Publish metadata that identifies the intended image
Put the image declarations in the page’s <head>. The Open Graph protocol defines the width and height properties as the number of pixels in the image object. Use an absolute, publicly reachable image URL.
<meta property="og:image" content="https://example.com/images/article-preview.jpg">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:image" content="https://example.com/images/article-preview.jpg">The Open Graph tags identify the page image. The X/Twitter tags request the large-card presentation. Keep the dimensions synchronized with the actual file; declaring 1200 × 630 for a differently sized or differently cropped asset can make debugging misleading.
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Generate metadata from the page’s own title and subject rather than reusing a generic site logo. Google recommends relevant, representative, high-resolution images and warns against generic logos. A page-specific image also gives a reader useful context when the card is detached from your site.
Google’s image choice is automated
Google Search Central states that image selection is automated and can draw from multiple page sources. Correct dimensions improve suitability, but dimensions alone cannot force Google to choose a particular file. Keep the intended image prominent and representative on the page as well as in metadata.
Balance sharpness, file weight and readability
Resolution and display density
The 1200-pixel width leaves room for large cards and high-density displays. Apple’s rich-preview note says, “Images should be at least 900 pixels in width.” A 1200-pixel-wide source clears that stated floor while retaining enough detail for downscaling.
File size
The researched X/Twitter guidance lists a 5 MB maximum for card images. Compress the file until it loads reliably while keeping small type and fine edges legible. Check the final encoded file, not only the dimensions shown by an image editor.
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Make text large enough to survive a mobile-sized card. Do not put essential information only in tiny type or in a low-contrast decorative layer. Provide meaningful alternative text wherever the destination platform or surrounding HTML supports it; metadata alone does not make text embedded in an image accessible.
A repeatable implementation workflow
- Identify the surfaces. List every place the page image will appear: social cards, messaging previews, search results and your own components. Record each component’s rendered width, height and crop style.
- Create the master. Export a 1200 × 630 image for link sharing. Keep important content in the central safe area and use a relevant subject rather than a generic logo.
- Create derivatives. For on-page boxes, generate files sized to the rendered component and device pixel ratio. Use a deliberate crop for square or portrait boxes instead of forcing the social master into every shape.
- Publish the tags. Add
og:image,og:image:widthandog:image:height. Addtwitter:card=summary_large_imageandtwitter:imagefor the X/Twitter large-card request. - Check delivery. Confirm the image URL is reachable without an interactive login, redirects to the intended asset, and serves the file within your normal response limits. Verify that the declared dimensions match the encoded file.
- Inspect real previews. Share a staging or test URL through each target service, then check desktop and mobile renderings. Look specifically for clipped text, faces near an edge, an unexpected card type or an old cached image.
- Revise the composition, not only the pixels. If a crop fails, move the subject inward or create a safer derivative. Merely increasing resolution will not fix an unsafe composition.
Dimension strategies compared
| Strategy | Best use | Source shape | Important trade-off |
|---|---|---|---|
| 1200 × 630 master | Social and messaging link previews | About 1.91:1 | Strong cross-platform baseline, but individual services may still crop or change card type. |
| Component-sized derivative | Article lists, search results and product grids | Matches the rendered box and device pixel ratio | Lower transfer cost and sharper fitting; it is not a replacement for the social master. |
| Square derivative | A component whose layout is explicitly square | 1:1 | Fits the component, but can lose top and bottom content if used as a general link-card source. |
| Very narrow or very tall source | Only a surface that explicitly requires it | Outside the 1.91:1 baseline | Greater likelihood of platform cropping and reduced control over the message. |
Troubleshooting thumbnail problems
The preview is cropped
Cause: the source ratio does not match the card renderer, or critical content is too close to an edge.
Fix: return to a 1200 × 630 master, move essential elements toward the center, and test the card in the affected service. Keep a surface-specific derivative when the service consistently uses a different shape.
The wrong image appears
Cause: the page points to an old URL, the width and height describe a different asset, or the platform has cached an earlier response.
Fix: inspect the page source and confirm that og:image and twitter:image contain the intended absolute URL. Check the file itself and its declared dimensions, then retest after the platform refreshes its cache.
The image looks soft on a phone
Cause: a low-resolution source was enlarged, or an on-page component is downloading a small file and stretching it.
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Fix: keep the 1200-pixel master for large cards and generate a derivative appropriate to the component’s rendered size and device pixel ratio. Do not enlarge a thumbnail that was intended for a smaller box.
The card is rejected or does not load
Cause: the file exceeds the researched 5 MB X/Twitter limit, the URL is inaccessible to the crawler, or the response is not the expected image.
Fix: compress below the platform’s stated limit without sacrificing legibility, make the asset publicly retrievable, and verify the response and dimensions independently of your browser session.
Google shows another image
Cause: Google chooses images automatically and can use more than one page source.
Fix: make the intended image relevant and representative in the page content as well as in metadata. Dimensions improve eligibility but cannot compel a particular selection.
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Frequently Asked Questions
Can 1200 × 630 force Google to display my chosen image?
No. Google Search Central says image selection is automated and can use multiple sources on the page. The dimensions and metadata make an image suitable, but they do not override Google’s selection system.
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What is the minimum width stated for Apple rich previews?
Apple’s Developer Documentation note TN3156 says images should be at least 900 pixels wide. A 1200-pixel-wide source meets that stated floor.
Should every thumbnail on my site use the same 1200 × 630 file?
No. Keep that file as the link-preview master, but generate derivatives for the actual rendered dimensions of your own cards. This avoids sending a large source to a small component and lets you choose a crop that fits its box.
Quick Recap
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