What is Responsive Image Markup Generator?
Responsive image markup lets the browser choose a suitable image file for the visitor's screen and layout. Good markup also includes width, height, loading, decoding, and useful alt text. Static sites benefit from this because images often have fixed exported filenames and need clear paths in the final build output.
quickAnswer
Generate responsive img or picture markup with srcset, sizes, width, height, and alt text. Helps avoid layout shift, missing image candidates, and inaccessible alt attributes on static sites.
Last updated: 2026-06-11
limitations
- Srcset candidates must exist at the specified paths in the published output. The generated markup references file paths; you must ensure each image file is copied to the correct location.
- The sizes attribute affects which srcset candidate the browser selects. An incorrect sizes value can cause the browser to download a larger or smaller image than needed.
- WebP source in a picture element requires a fallback img src for older browsers that do not support WebP. Without a fallback, unsupported browsers will show no image.
Sources:MDN Web Docs · W3C Specifications · jquery.app on GitHub
How to use this tool
- Enter the default image URL, alt text, width, and height.
- Add srcset candidates as image-url width pairs.
- Choose whether to generate a plain img tag or a picture element with a WebP source.
- Copy the markup and confirm that every image file exists in the published output.
What you can use it for
- Prepare responsive images for static HTML pages.
- Avoid missing width and height attributes that cause layout shift.
- Create picture markup with WebP and fallback image paths.