Check images used in social link previews through Open Graph metadata. Verify dimensions, aspect ratio, file size, and HTTPS URLs, then resize assets and update tags to reduce missing images and unwanted cropping.
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Use when auditing Open Graph tags or generating og:image assets. Applies to any page that may be shared on social networks or messaging platforms.
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An incorrectly sized og:image is displayed poorly or not at all on social platforms—Facebook, Twitter/X, LinkedIn each crop or skip images that don't meet their requirements, resulting in blank or distorted link previews.
Find the og:image meta tag in <head> and fetch the image URL. Check the image dimensions and file size. Flag if width < 1200px, height < 630px, aspect ratio differs significantly from 1.91:1, or file size exceeds 5 MB.
Generate or resize the og:image to exactly 1200×630 pixels. Export as JPEG at 80–85% quality to balance visual quality and file size. Reference the absolute HTTPS URL in the og:image meta tag. Add og:image:width and og:image:height tags to help platforms render the image without downloading it first.
Social platforms use og:image to construct the visual card shown when a URL is shared. An image too small may be skipped or shown as a thumbnail. An image with the wrong aspect ratio gets cropped, often cutting off important content. The recommended 1200×630 size ensures optimal display across Facebook, LinkedIn, Slack, and iMessage.
Check the og:image meta tag value. Fetch the image and verify: (1) dimensions are at least 1200×630 px, (2) aspect ratio is approximately 1.91:1, (3) file size is under 5 MB, (4) URL is absolute HTTPS, (5) og:image:width and og:image:height tags match actual dimensions. Flag relative URLs or images smaller than 600×315 px.
For full implementation details, code examples, and framework-specific guidance,
see references/rule.md.
Rule page: https://frontendchecklist.io/rules/seo/og-image-size
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Create and review custom 404 pages that help visitors recover from broken or moved links through search and navigation. Check the rendered page and HTTP response so missing content returns a proper 404 status.
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Audit or create a dedicated About page that explains a website’s purpose and identifies its people or organization. Review the rendered output and supporting information, including expertise and contact details, to find gaps.
한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.
Review and add automated accessibility checks for components, pages, and continuous integration workflows. Use axe-based tools to detect structural and attribute issues, while identifying checks that still need keyboard or screen reader testing.
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Review sign-in, registration, multi-factor authentication, and account recovery for accessibility barriers. Find blocked paste, difficult code entry, and inaccessible backup methods, then suggest authentication paths that support password managers, autofill, or device approval.
한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.
Review form errors, success messages, and live updates so screen reader users receive important notifications. Check the HTML delivered to the browser, announcement settings, display duration, and dismissal controls, then identify specific elements that need changes.
한국어 요약은 준비 중입니다. 영어 요약을 표시하고 있습니다.
Review HTML tables so screen reader users can understand how headers and data relate. Check header markup, table descriptions, and merged cells, then identify specific fixes and ways to verify them.
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