diff --git a/package-lock.json b/package-lock.json
index 9290833..7579151 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,6 +12,7 @@
         "@fontsource-variable/rubik": "^5.2.8",
         "@fontsource/inter": "^5.2.8",
         "@iconify/svelte": "^5.2.1",
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         "@types/leaflet": "^1.9.21",
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@@ -20,6 +21,8 @@
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         "qrcode": "^1.5.4",
         "sanitize-html": "^2.13.1",
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         "sharp": "^0.34.5"
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@@ -1239,6 +1242,221 @@
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+      "optional": true,
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+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-win32-ia32-msvc/-/resvg-js-win32-ia32-msvc-2.6.2.tgz",
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+      "cpu": [
+        "ia32"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
+      "engines": {
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+      "resolved": "https://registry.npmjs.org/@resvg/resvg-js-win32-x64-msvc/-/resvg-js-win32-x64-msvc-2.6.2.tgz",
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+      "cpu": [
+        "x64"
+      ],
+      "license": "MPL-2.0",
+      "optional": true,
+      "os": [
+        "win32"
+      ],
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@@ -1685,6 +1903,22 @@
         "win32"
       ]
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+    "node_modules/@shuding/opentype.js": {
+      "version": "1.4.0-beta.0",
+      "resolved": "https://registry.npmjs.org/@shuding/opentype.js/-/opentype.js-1.4.0-beta.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "fflate": "^0.7.3",
+        "string.prototype.codepointat": "^0.2.1"
+      },
+      "bin": {
+        "ot": "bin/ot"
+      },
+      "engines": {
+        "node": ">= 8.0.0"
+      }
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     "node_modules/@standard-schema/spec": {
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       "resolved": "https://registry.npmjs.org/@standard-schema/spec/-/spec-1.1.0.tgz",
@@ -2559,6 +2793,15 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/base64-js": {
+      "version": "0.0.8",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-0.0.8.tgz",
+      "integrity": "sha512-3XSA2cR/h/73EzlXXdU6YNycmYI7+kicTxks4eJg2g39biHR84slg2+des+p7iHYhbRg/udIS4TD53WabcOUkw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4"
+      }
+    },
     "node_modules/blurhash": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/blurhash/-/blurhash-2.0.5.tgz",
@@ -2594,6 +2837,15 @@
         "node": ">=6"
       }
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+    "node_modules/camelize": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/camelize/-/camelize-1.0.1.tgz",
+      "integrity": "sha512-dU+Tx2fsypxTgtLoE36npi3UqcjSSMNYfkqgmoEhtZrraP5VWq0K7FkWVTYa8eMPtnU/G2txVsfdCJTn9uzpuQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
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       "resolved": "https://registry.npmjs.org/chai/-/chai-5.3.3.tgz",
@@ -2803,6 +3055,47 @@
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+    "node_modules/css-background-parser": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/css-background-parser/-/css-background-parser-0.1.0.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/css-box-shadow": {
+      "version": "1.0.0-3",
+      "resolved": "https://registry.npmjs.org/css-box-shadow/-/css-box-shadow-1.0.0-3.tgz",
+      "integrity": "sha512-9jaqR6e7Ohds+aWwmhe6wILJ99xYQbfmK9QQB9CcMjDbTxPZjwEmUQpU91OG05Xgm8BahT5fW+svbsQGjS/zPg==",
+      "license": "MIT"
+    },
+    "node_modules/css-color-keywords": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/css-color-keywords/-/css-color-keywords-1.0.0.tgz",
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+      "license": "ISC",
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/css-gradient-parser": {
+      "version": "0.0.17",
+      "resolved": "https://registry.npmjs.org/css-gradient-parser/-/css-gradient-parser-0.0.17.tgz",
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+      "license": "MIT",
+      "engines": {
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+      }
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+    "node_modules/css-to-react-native": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/css-to-react-native/-/css-to-react-native-3.2.0.tgz",
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+      "license": "MIT",
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+        "css-color-keywords": "^1.0.0",
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@@ -2966,6 +3259,15 @@
       "dev": true,
       "license": "MIT"
     },
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+      "resolved": "https://registry.npmjs.org/emoji-regex-xs/-/emoji-regex-xs-2.0.1.tgz",
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+      "license": "MIT",
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@@ -3041,6 +3343,12 @@
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       }
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+    "node_modules/escape-html": {
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+      "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
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+      "license": "MIT"
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@@ -3111,6 +3419,12 @@
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+      "resolved": "https://registry.npmjs.org/fflate/-/fflate-0.7.4.tgz",
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@@ -3243,6 +3557,18 @@
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+      "resolved": "https://registry.npmjs.org/hex-rgb/-/hex-rgb-4.3.0.tgz",
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+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
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+      "funding": {
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@@ -3770,6 +4096,16 @@
         "url": "https://opencollective.com/parcel"
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@@ -3983,6 +4319,22 @@
       "dev": true,
       "license": "BlueOak-1.0.0"
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@@ -4133,6 +4485,12 @@
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@@ -4282,6 +4640,37 @@
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       }
     },
+    "node_modules/satori": {
+      "version": "0.26.0",
+      "resolved": "https://registry.npmjs.org/satori/-/satori-0.26.0.tgz",
+      "integrity": "sha512-tkMFrfIs3l2mQ2JEcyW0ADTy3zGggFRFzi6Ef8YozQSFsFKEqaSO1Y8F9wJg4//PJGQauMalHGTUEkPrFwhVPA==",
+      "license": "MPL-2.0",
+      "dependencies": {
+        "@shuding/opentype.js": "1.4.0-beta.0",
+        "css-background-parser": "^0.1.0",
+        "css-box-shadow": "1.0.0-3",
+        "css-gradient-parser": "^0.0.17",
+        "css-to-react-native": "^3.0.0",
+        "emoji-regex-xs": "^2.0.1",
+        "escape-html": "^1.0.3",
+        "linebreak": "^1.1.0",
+        "parse-css-color": "^0.2.1",
+        "postcss-value-parser": "^4.2.0",
+        "yoga-layout": "^3.2.1"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
+    "node_modules/satori-html": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/satori-html/-/satori-html-0.3.2.tgz",
+      "integrity": "sha512-wjTh14iqADFKDK80e51/98MplTGfxz2RmIzh0GqShlf4a67+BooLywF17TvJPD6phO0Hxm7Mf1N5LtRYvdkYRA==",
+      "license": "MIT",
+      "dependencies": {
+        "ultrahtml": "^1.2.0"
+      }
+    },
     "node_modules/semver": {
       "version": "7.7.4",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
@@ -4496,6 +4885,12 @@
         "node": ">=8"
       }
     },
+    "node_modules/string.prototype.codepointat": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/string.prototype.codepointat/-/string.prototype.codepointat-0.2.1.tgz",
+      "integrity": "sha512-2cBVCj6I4IOvEnjgO/hWqXjqBGsY+zwPmHl12Srk9IXSZ56Jwwmy+66XO5Iut/oQVR7t5ihYdLB0GMa4alEUcg==",
+      "license": "MIT"
+    },
     "node_modules/strip-ansi": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.2.0.tgz",
@@ -4697,6 +5092,12 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/tiny-inflate": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/tiny-inflate/-/tiny-inflate-1.0.3.tgz",
+      "integrity": "sha512-pkY1fj1cKHb2seWDy0B16HeWyczlJA9/WW3u3c4z/NiWDsO3DOU5D7nhTLE9CF0yXv/QZFY7sEJmj24dK+Rrqw==",
+      "license": "MIT"
+    },
     "node_modules/tinybench": {
       "version": "2.9.0",
       "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
@@ -4801,6 +5202,12 @@
         "node": ">=14.17"
       }
     },
+    "node_modules/ultrahtml": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/ultrahtml/-/ultrahtml-1.6.0.tgz",
+      "integrity": "sha512-R9fBn90VTJrqqLDwyMph+HGne8eqY1iPfYhPzZrvKpIfwkWZbcYlfpsb8B9dTvBfpy1/hqAD7Wi8EKfP9e8zdw==",
+      "license": "MIT"
+    },
     "node_modules/undici-types": {
       "version": "6.21.0",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
@@ -4808,6 +5215,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/unicode-trie": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/unicode-trie/-/unicode-trie-2.0.0.tgz",
+      "integrity": "sha512-x7bc76x0bm4prf1VLg79uhAzKw8DVboClSN5VxJuQ+LKDOVEW9CdH+VY7SP+vX7xCYQqzzgQpFqz15zeLvAtZQ==",
+      "license": "MIT",
+      "dependencies": {
+        "pako": "^0.2.5",
+        "tiny-inflate": "^1.0.0"
+      }
+    },
     "node_modules/uri-js-replace": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/uri-js-replace/-/uri-js-replace-1.0.1.tgz",
@@ -6252,6 +6669,12 @@
         "node": ">=6"
       }
     },
+    "node_modules/yoga-layout": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/yoga-layout/-/yoga-layout-3.2.1.tgz",
+      "integrity": "sha512-0LPOt3AxKqMdFBZA3HBAt/t/8vIKq7VaQYbuA8WxCgung+p9TVyKRYdpvCb80HcdTN2NkbIKbhNwKUfm3tQywQ==",
+      "license": "MIT"
+    },
     "node_modules/zimmerframe": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/zimmerframe/-/zimmerframe-1.1.4.tgz",
diff --git a/package.json b/package.json
index f8f151c..75f2b9e 100644
--- a/package.json
+++ b/package.json
@@ -42,6 +42,7 @@
     "@fontsource-variable/rubik": "^5.2.8",
     "@fontsource/inter": "^5.2.8",
     "@iconify/svelte": "^5.2.1",
+    "@resvg/resvg-js": "^2.6.2",
     "@turf/buffer": "^7.3.5",
     "@types/leaflet": "^1.9.21",
     "blurhash": "^2.0.5",
@@ -50,6 +51,8 @@
     "marked": "^17.0.2",
     "qrcode": "^1.5.4",
     "sanitize-html": "^2.13.1",
+    "satori": "^0.26.0",
+    "satori-html": "^0.3.2",
     "sharp": "^0.34.5"
   },
   "type": "module"
diff --git a/scripts/generate-icons.mjs b/scripts/generate-icons.mjs
index 987626b..722351e 100644
--- a/scripts/generate-icons.mjs
+++ b/scripts/generate-icons.mjs
@@ -67,6 +67,9 @@ const EXTRA_ICONS = [
   'information-outline',
   // OrganisationsMapBlock: activate-overlay
   'cursor-default-click-outline',
+  // CalendarBlock: social-image buttons
+  'image-outline',
+  'crop-square',
 ];
 
 const STATIC_PATTERN = /icon="mdi:([a-z0-9-]+)"/g;
diff --git a/src/lib/components/blocks/CalendarBlock.svelte b/src/lib/components/blocks/CalendarBlock.svelte
index 5019e16..ee14077 100644
--- a/src/lib/components/blocks/CalendarBlock.svelte
+++ b/src/lib/components/blocks/CalendarBlock.svelte
@@ -886,6 +886,36 @@
                                 >
                             </button>
                         {/if}
+                        {#if item._slug}
+                            <a
+                                href={`/api/social/calendar/${item._slug}?format=og`}
+                                download={`termin-${item._slug}-og.png`}
+                                class="btn-outline btn-sm group"
+                                aria-label="Social-Bild (Quer 1200×630)"
+                                title="Social-Bild Quer (1200×630)"
+                            >
+                                <Icon
+                                    icon="mdi:image-outline"
+                                    class="size-3.5 shrink-0"
+                                    aria-hidden="true"
+                                />
+                                <span class="whitespace-nowrap">Bild quer</span>
+                            </a>
+                            <a
+                                href={`/api/social/calendar/${item._slug}?format=square`}
+                                download={`termin-${item._slug}-square.png`}
+                                class="btn-outline btn-sm group"
+                                aria-label="Social-Bild (Quadrat 1080×1080)"
+                                title="Social-Bild Quadrat (1080×1080)"
+                            >
+                                <Icon
+                                    icon="mdi:crop-square"
+                                    class="size-3.5 shrink-0"
+                                    aria-hidden="true"
+                                />
+                                <span class="whitespace-nowrap">Bild quadr.</span>
+                            </a>
+                        {/if}
                         <button
                             type="button"
                             onclick={() => jumpToEventInGrid(item)}
diff --git a/src/lib/iconify-mdi-subset.generated.json b/src/lib/iconify-mdi-subset.generated.json
index 53d2141..a225b44 100644
--- a/src/lib/iconify-mdi-subset.generated.json
+++ b/src/lib/iconify-mdi-subset.generated.json
@@ -114,6 +114,12 @@
     "google": {
       "body": "<path fill=\"currentColor\" d=\"M21.35 11.1h-9.17v2.73h6.51c-.33 3.81-3.5 5.44-6.5 5.44C8.36 19.27 5 16.25 5 12c0-4.1 3.2-7.27 7.2-7.27c3.09 0 4.9 1.97 4.9 1.97L19 4.72S16.56 2 12.1 2C6.42 2 2.03 6.8 2.03 12c0 5.05 4.13 10 10.22 10c5.35 0 9.25-3.67 9.25-9.09c0-1.15-.15-1.81-.15-1.81\"/>"
     },
+    "image-outline": {
+      "body": "<path fill=\"currentColor\" d=\"M19 19H5V5h14m0-2H5a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2V5a2 2 0 0 0-2-2m-5.04 9.29l-2.75 3.54l-1.96-2.36L6.5 17h11z\"/>"
+    },
+    "crop-square": {
+      "body": "<path fill=\"currentColor\" d=\"M18 18H6V6h12m0-2H6a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V6a2 2 0 0 0-2-2\"/>"
+    },
     "calendar-search": {
       "body": "<path fill=\"currentColor\" d=\"M15.5 12c2.5 0 4.5 2 4.5 4.5c0 .88-.25 1.71-.69 2.4l3.08 3.1L21 23.39l-3.12-3.07c-.69.43-1.51.68-2.38.68c-2.5 0-4.5-2-4.5-4.5s2-4.5 4.5-4.5m0 2a2.5 2.5 0 0 0-2.5 2.5a2.5 2.5 0 0 0 2.5 2.5a2.5 2.5 0 0 0 2.5-2.5a2.5 2.5 0 0 0-2.5-2.5M19 8H5v11h4.5c.31.75.76 1.42 1.31 2H5a2 2 0 0 1-2-2V5c0-1.11.89-2 2-2h1V1h2v2h8V1h2v2h1a2 2 0 0 1 2 2v8.03c-.5-.81-1.2-1.49-2-2.03z\"/>"
     },
diff --git a/src/routes/api/social/calendar/[slug]/+server.ts b/src/routes/api/social/calendar/[slug]/+server.ts
new file mode 100644
index 0000000..a785f60
--- /dev/null
+++ b/src/routes/api/social/calendar/[slug]/+server.ts
@@ -0,0 +1,154 @@
+import type { RequestHandler } from "./$types";
+import { error } from "@sveltejs/kit";
+import satori from "satori";
+import { html as htmlToReact } from "satori-html";
+import { Resvg } from "@resvg/resvg-js";
+import { getCalendarItemBySlug } from "$lib/cms";
+
+type Format = "og" | "square";
+
+const SIZES: Record<Format, { w: number; h: number }> = {
+  og: { w: 1200, h: 630 },
+  square: { w: 1080, h: 1080 },
+};
+
+const FONT_URLS: Record<string, string> = {
+  regular: "https://fonts.gstatic.com/s/inter/v18/UcCO3FwrK3iLTeHuS_nVMrMxCp50SjIw2boKoduKmMEVuLyfMZhrib2Bg-4.ttf",
+  semibold: "https://fonts.gstatic.com/s/inter/v18/UcCO3FwrK3iLTeHuS_nVMrMxCp50SjIw2boKoduKmMEVuFuYMZhrib2Bg-4.ttf",
+  bold: "https://fonts.gstatic.com/s/inter/v18/UcCO3FwrK3iLTeHuS_nVMrMxCp50SjIw2boKoduKmMEVuGKYMZhrib2Bg-4.ttf",
+};
+
+let fontCache: { regular: ArrayBuffer; semibold: ArrayBuffer; bold: ArrayBuffer } | null = null;
+
+async function loadFonts() {
+  if (fontCache) return fontCache;
+  const [regular, semibold, bold] = await Promise.all(
+    (["regular", "semibold", "bold"] as const).map(async (w) => {
+      const res = await fetch(FONT_URLS[w]);
+      if (!res.ok) throw new Error(`Font fetch failed (${w}): ${res.status}`);
+      return res.arrayBuffer();
+    }),
+  );
+  fontCache = { regular, semibold, bold };
+  return fontCache;
+}
+
+function formatDate(iso: string | undefined): { date: string; time: string | null } {
+  if (!iso) return { date: "", time: null };
+  const d = new Date(iso);
+  const date = d.toLocaleDateString("de-DE", { day: "2-digit", month: "long", year: "numeric" });
+  const hasTime = !/T00:00:00/.test(iso);
+  const time = hasTime ? d.toLocaleTimeString("de-DE", { hour: "2-digit", minute: "2-digit" }) : null;
+  return { date, time };
+}
+
+function weekday(iso: string | undefined): string {
+  if (!iso) return "";
+  return new Date(iso).toLocaleDateString("de-DE", { weekday: "long" });
+}
+
+const cache = new Map<string, { png: Buffer; ts: number }>();
+const CACHE_TTL = 10 * 60_000; // 10min
+
+export const GET: RequestHandler = async ({ params, url, setHeaders }) => {
+  const slug = params.slug;
+  const formatParam = url.searchParams.get("format") === "square" ? "square" : "og";
+  const cacheKey = `${slug}:${formatParam}`;
+  const now = Date.now();
+  const cached = cache.get(cacheKey);
+  if (cached && now - cached.ts < CACHE_TTL) {
+    setHeaders({
+      "content-type": "image/png",
+      "cache-control": "public, max-age=600, stale-while-revalidate=86400",
+    });
+    return new Response(new Uint8Array(cached.png), { status: 200 });
+  }
+
+  const itemRaw = await getCalendarItemBySlug(slug, { locale: "de" });
+  if (!itemRaw) throw error(404, "Termin nicht gefunden");
+  const item = itemRaw as typeof itemRaw & { location?: unknown };
+
+  const { w, h } = SIZES[formatParam];
+  const fonts = await loadFonts();
+
+  const title = (item.title ?? "").trim();
+  const { date, time } = formatDate(item.terminZeit);
+  const day = weekday(item.terminZeit);
+  const locationText =
+    typeof item.location === "object" && item.location !== null
+      ? ((item.location as { text?: string }).text ?? "").trim()
+      : "";
+
+  const square = formatParam === "square";
+  const titleFs = square ? 56 : 54;
+  const dateFs = square ? 84 : 78;
+  const padX = square ? 80 : 90;
+  const titleClamped = title.length > 110 ? title.slice(0, 107) + "…" : title;
+  const locClamped =
+    locationText.length > 70 ? locationText.slice(0, 67) + "…" : locationText;
+
+  const pinSvg = `<svg width="34" height="34" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg"><path d="M12 22s7-7.58 7-13a7 7 0 1 0-14 0c0 5.42 7 13 7 13z" fill="#7fb58a"/><circle cx="12" cy="9" r="2.5" fill="#0a2011"/></svg>`;
+
+  const template = `
+    <div style="display:flex;flex-direction:column;width:${w}px;height:${h}px;background:linear-gradient(135deg,#0a2011 0%,#12361c 55%,#1a4d28 100%);color:#f0f5f1;padding:${padX}px;font-family:Inter;position:relative;">
+      <div style="display:flex;justify-content:space-between;align-items:center;font-size:20px;letter-spacing:0.18em;font-weight:600;color:#7fb58a;text-transform:uppercase;">
+        <div style="display:flex;align-items:center;">Windwiderstand Thüringen</div>
+        <div style="display:flex;align-items:center;color:#b3d1b9;">Termin</div>
+      </div>
+
+      <div style="display:flex;flex-direction:column;margin-top:${square ? 56 : 28}px;flex:1;">
+        <div style="display:flex;font-size:28px;color:#b3d1b9;font-weight:500;text-transform:capitalize;margin-bottom:6px;">${day}</div>
+        <div style="display:flex;align-items:baseline;flex-wrap:wrap;">
+          <div style="display:flex;font-size:${dateFs}px;font-weight:700;color:#ffffff;letter-spacing:-0.02em;line-height:1;">${date}</div>
+          ${time ? `<div style="display:flex;font-size:44px;font-weight:600;color:#d9e8dc;margin-left:26px;line-height:1;">${time} Uhr</div>` : ""}
+        </div>
+
+        <div style="display:flex;font-size:${titleFs}px;font-weight:700;color:#ffffff;line-height:1.15;margin-top:${square ? 48 : 30}px;letter-spacing:-0.015em;">${escapeHtml(titleClamped)}</div>
+      </div>
+
+      ${
+        locClamped
+          ? `<div style="display:flex;align-items:center;font-size:26px;color:#d9e8dc;font-weight:500;margin-bottom:24px;gap:14px;">${pinSvg}<div style="display:flex;">${escapeHtml(locClamped)}</div></div>`
+          : ""
+      }
+
+      <div style="display:flex;justify-content:space-between;align-items:center;font-size:20px;color:#7fb58a;border-top:1px solid #1a4d28;padding-top:18px;">
+        <div style="display:flex;align-items:center;font-weight:600;">windwiderstand.de</div>
+        <div style="display:flex;align-items:center;font-weight:500;letter-spacing:0.04em;">Mit Vernunft in die Zukunft</div>
+      </div>
+    </div>
+  `;
+
+  const reactLike = htmlToReact(template);
+
+  const svg = await satori(reactLike as Parameters<typeof satori>[0], {
+    width: w,
+    height: h,
+    fonts: [
+      { name: "Inter", data: fonts.regular, weight: 400, style: "normal" },
+      { name: "Inter", data: fonts.semibold, weight: 500, style: "normal" },
+      { name: "Inter", data: fonts.semibold, weight: 600, style: "normal" },
+      { name: "Inter", data: fonts.bold, weight: 700, style: "normal" },
+    ],
+  });
+
+  const resvg = new Resvg(svg, { fitTo: { mode: "width", value: w } });
+  const png = resvg.render().asPng();
+  const pngBuf = Buffer.from(png);
+  cache.set(cacheKey, { png: pngBuf, ts: now });
+
+  setHeaders({
+    "content-type": "image/png",
+    "cache-control": "public, max-age=600, stale-while-revalidate=86400",
+  });
+  return new Response(new Uint8Array(pngBuf), { status: 200 });
+};
+
+function escapeHtml(s: string): string {
+  return s
+    .replace(/&/g, "&amp;")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;")
+    .replace(/'/g, "&#39;");
+}