01Why signatures look blurry
Email clients downscale large images and upscale small ones. A 80px logo stretched to 200px looks soft on retina screens. Canva and screenshot exports often default to the wrong pixel density.
02Blurry signature in Outlook
Classic Outlook can compress images. In File › Options › Mail › Editor Options › Advanced, review picture compression settings for sent messages.
Microsoft documents resizing via right-click › Picture › Size in the signature editor instead of dragging corners.
03Blurry signature in Gmail
Use Insert image › Web Address with a file uploaded at 2× display size. Gmail's small/medium/large presets can soften logos if the source file is already tiny.
04Canva and design-tool exports
Export PNG at 2× the width you need in the signature (often 600px for a 300px logo). Re-host the file on https rather than hotlinking a Canva share link that may expire.
Generate a signature with retina-ready hosted images
FAQ
Why is my email signature logo blurry?+−
The source image is too small for how wide it displays, or the client compressed it on send. Upload at twice the display width, set an explicit width near 300px for logos, and avoid dragging to resize in Outlook.
Why is my signature blurry in Outlook?+−
Classic Outlook for Windows can compress images, and dragging an image to resize it degrades quality. Turn off unnecessary compression, set the size numerically, and use a logo exported at twice the size it appears in the signature.
What size should a signature logo be?+−
Display logos around 300px wide on screen. Upload a 600px-wide PNG or JPG on a public https link so retina displays stay sharp without bloating Gmail's character limit.
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