How To Choose İmage Dimensions
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Pixels, aspect ratio, and density
Image dimensions are one of the small, unglamorous details that decide whether a piece of content looks sharp or amateurish. Upload a 2400-pixel-wide image to a blog and it loads slowly; upload a 600-pixel one and it pixelates on high-density screens. Post the wrong aspect ratio to Instagram and the platform crops the important part out of frame.
Web images: the 2× rule
This guide covers how to pick the right dimensions for each context — web, social, email, print — and why the aspect ratio usually matters more than the raw pixel count. Get these choices right once and your images look professional everywhere without extra effort.
Blog post featured images
A safe standard: 1200 × 630 pixels (roughly 1.91:1). This matches Open Graph specifications, so the same file works as a blog hero and as a Twitter / LinkedIn preview card. Crop to 1200 × 675 (16:9) if you want a slightly taller hero but keep an OG version in 1.91:1.
Social media by platform
Most email clients render at 600 pixels wide maximum. Design headers at 600 × 200 or 1200 × 400 (for retina). Keep the file under 100 KB — large images get stripped or block-quoted by Gmail. Always set a meaningful alt attribute; many recipients view email with images blocked, and alt text is what they see.
The aspect ratio mistake that ruins social posts
A layout that looks perfect on a 27-inch monitor can be broken on an iPhone SE. Before shipping a page, view it on your phone, a tablet, and a laptop. Look specifically at whether images crop awkwardly, load slowly, or push text off the screen.
Email header images
Once you know the sizes for your blog, social posts, email headers, and thumbnails, save templates in your design tool. A single click of the right template means you never open a blank canvas and guess. The number one reason teams ship the wrong image size is forgetting to check — templates remove the decision.