How to embed images in GitHub Markdown or blogs?
Local Markdown notes can use local or relative image paths. GitHub READMEs can reference images stored in the repository. Use a public image URL when sharing an image across websites.

This working example displays the site's icon. Upload your own image and replace the example URL with its generated image link.
Link availability and access
Links are intended for ongoing sharing, but continued availability is not guaranteed. Keep independent backups of important files. Files are accessible to anyone who has their link. HTTPS protects data in transit, but a random URL is not access control. Do not upload confidential files.
Format Compatibility and Auto-Optimization
When enabled, large JPEG photos may be resized and re-encoded with some quality loss. PNG/APNG, WebP and GIF retain their original bytes. Turn optimization off to keep the original JPEG. Files must still fit the size and pixel limits.