{"editorial_visual":"https://favicon.now/static/images/editorial/guides/favicon-ico-format.webp","implementation_artifact":null,"published":"2026-07-31","section_headings":["What the container stores","Choose the frames","Quality control","Read the directory before decoding frames","Choose frame content deliberately"],"sources":[{"label":"Microsoft: icon resource format","url":"https://learn.microsoft.com/en-us/windows/win32/menurc/icon-resource"},{"label":"Pillow ICO plugin reference","url":"https://pillow.readthedocs.io/en/stable/handbook/image-file-formats.html#ico"}],"title":"Favicon ICO Format: Inside Multi-Resolution Icon Files","updated":"2026-07-31","url":"https://favicon.now/guides/favicon-ico-format"}