--- title: "No crawlable favicon in a Google-supported format (seo/favicon)" description: "seo/favicon: Google shows the favicon next to search results and needs a crawlable, square (≥ 48×48) ICO/PNG/GIF/JPEG/BMP." canonical: https://void-design.vercel.app/rules/seo/favicon lastModified: 2026-09-16 --- # No crawlable favicon in a Google-supported format `seo/favicon` · severity **error** · category SEO · detected by `void seo` and `void audit` ## Why it matters Google shows the favicon next to search results and needs a crawlable, square (≥ 48×48) ICO/PNG/GIF/JPEG/BMP. SVG-only favicons aren't in Google's supported list. ## How to fix it Add app/favicon.ico and app/icon.png (keep icon.svg as an extra if you like). ## Example ```text app/favicon.ico → app/icon.png → app/apple-icon.png → ``` ## References - https://developers.google.com/search/docs/appearance/favicon-in-search - https://nextjs.org/docs/app/api-reference/file-conventions/metadata/app-icons ## More seo rules `void seo` reports 60 rules in this category. What search engines need from the raw response: status codes, titles and descriptions in , self-referencing canonicals, one h1, crawlable links, Open Graph, icons, robots.txt and a sitemap with real dates. - `og-image-invalid` og:image isn't a reachable, absolute, raster image within size limits — [seo/og-image-invalid](https://void-design.vercel.app/rules/seo/og-image-invalid) - `og-image-size` og:image is smaller than 1200×630 or far from 1.91:1 — [seo/og-image-size](https://void-design.vercel.app/rules/seo/og-image-size) - `og-image-meta` og:image:width/height missing or wrong, or og:image:alt missing — [seo/og-image-meta](https://void-design.vercel.app/rules/seo/og-image-meta) - `twitter-card` twitter:card missing — [seo/twitter-card](https://void-design.vercel.app/rules/seo/twitter-card) - `apple-touch-icon` apple-touch-icon missing or not a 180×180 PNG — [seo/apple-touch-icon](https://void-design.vercel.app/rules/seo/apple-touch-icon) - `manifest` Web app manifest missing or incomplete — [seo/manifest](https://void-design.vercel.app/rules/seo/manifest) - `theme-color` No theme-color meta — [seo/theme-color](https://void-design.vercel.app/rules/seo/theme-color) - `robots-txt-unreachable` robots.txt returns 5xx/429 or times out — [seo/robots-txt-unreachable](https://void-design.vercel.app/rules/seo/robots-txt-unreachable) Detected by `void seo` and `void audit`. Explain it in a terminal: `void rules seo/favicon`