When a page is shared on Facebook, LinkedIn, Slack, WhatsApp, iMessage or X, the preview image comes from the og:image tag. 1200×630 pixels (1.91:1) renders correctly on all of them, with a safe centre for text since some crop toward square on mobile. Keep the file under 1 MB — Facebook’s cache is slow with bigger images and some platforms skip them.
Every Standard size on this page, verified for 2026: Phone / Story 1080×1920 px (9:16), Square 1080×1080 px (1:1), Portrait 1000×1500 px (2:3), Landscape 2048×1365 px (3:2), Slide 2048×1536 px (4:3), Open Graph / link preview 1200×630 px (1.91:1 · under 1 MB), Full HD 1920×1080 px (16:9), 4K UHD 3840×2160 px (16:9). Each card is a live preview of your image in that frame — drag to reposition, slide between Fit (whole image, background added) and Fill (frame covered, edges cropped), then download the one you need or every size as a ZIP. Nothing is uploaded; the rendering runs in your browser.
Export as JPG at quality 85 or PNG for text-heavy designs, then add <meta property="og:image" content="…"> plus og:image:width and og:image:height to the page. X’s native 1600×900 card size is on the X / Twitter tab.
This is a pre-set view of the Social Media Image Resizer. Every other platform is one tab away.