diff --git a/agent.md b/agent.md
index 07b5e68..d347430 100644
--- a/agent.md
+++ b/agent.md
@@ -193,6 +193,7 @@ There are three selectable data sources:
 - Review UI: show picture size, source, target assignment, duplicate state, per-row save and batch save actions.
 - Hudy picture parsing uses the correct product color variant, checks EANs and extracts large gallery images.
 - Idealo uses the browser adapter and is intended mainly as a picture source.
+- Idealo picture parsing must read product gallery images from Splide gallery markup (`splide__track`, `splide__list`, `splide__slide`) and choose the largest available URL from `srcset`, `data-srcset`, `data-large`, `data-original`, `data-src` or `src`. Do not use search-result thumbnails or small preview URLs as production picture candidates when gallery images exist.
 - Image preview is square.
 - Settings is at the bottom of the left panel; database status is directly above it.
 
diff --git a/src/services/catalog-products.ts b/src/services/catalog-products.ts
index 3605004..1395ee5 100644
--- a/src/services/catalog-products.ts
+++ b/src/services/catalog-products.ts
@@ -310,7 +310,11 @@ async function findSourceCandidates(source, product, { includePictures = false }
           attempt,
           product,
         );
-        if (includePictures) candidate.pictures = extractPictureUrls(result.pageSource, result.url || attempt.url);
+        if (includePictures) {
+          candidate.pictures = source.key === "idealo"
+            ? extractIdealoGalleryPictureUrls(result.pageSource, result.url || attempt.url)
+            : extractPictureUrls(result.pageSource, result.url || attempt.url);
+        }
         return {
           source,
           query: attempt.query,
@@ -381,6 +385,8 @@ async function findSourceCandidates(source, product, { includePictures = false }
           for (const candidate of candidates) {
             if (source.key === "hudy" && candidate.url) {
               candidate.pictures = await extractPicturesFromPage(candidate.url, source.browserEngine);
+            } else if (source.key === "idealo") {
+              candidate.pictures = extractIdealoGalleryPictureUrls(html, response.url || attempt.url);
             } else {
               candidate.pictures = extractPictureUrls(html, response.url || attempt.url);
             }
@@ -742,6 +748,108 @@ function extractPictureUrls(html, pageUrl) {
   return urls.slice(0, 12);
 }
 
+export function extractIdealoGalleryPictureUrls(html, pageUrl) {
+  const source = String(html ?? "");
+  const galleryMatches = [
+    ...source.matchAll(/<li\b[^>]*class=["'][^"']*splide__slide[^"']*["'][^>]*>[\s\S]*?<\/li>/gi),
+  ];
+  const orderedGalleryUrls = [];
+
+  for (const match of galleryMatches) {
+    const best = pickBestImageUrlFromMarkup(match[0], pageUrl);
+    if (best && !orderedGalleryUrls.includes(best)) orderedGalleryUrls.push(best);
+  }
+
+  if (orderedGalleryUrls.length) return orderedGalleryUrls.slice(0, 12);
+
+  const trackMatch = source.match(/<div\b[^>]*class=["'][^"']*splide__track[^"']*["'][^>]*>[\s\S]*?<\/div>/i);
+  if (trackMatch) {
+    const best = pickBestImageUrlFromMarkup(trackMatch[0], pageUrl);
+    if (best) return [best];
+  }
+
+  return extractPictureUrls(source, pageUrl);
+}
+
+function pickBestImageUrlFromMarkup(markup, pageUrl) {
+  const candidates = [];
+  const add = (value, descriptorScore = 0) => {
+    const normalized = normalizeImageCandidateUrl(value, pageUrl);
+    if (!normalized) return;
+    candidates.push({
+      url: normalized,
+      score: scoreImageCandidate(normalized, descriptorScore),
+    });
+  };
+
+  for (const attribute of ["srcset", "data-srcset"]) {
+    for (const match of markup.matchAll(new RegExp(`${attribute}=["']([^"']+)`, "gi"))) {
+      for (const candidate of parseSrcsetCandidates(match[1], pageUrl)) {
+        add(candidate.url, candidate.score);
+      }
+    }
+  }
+
+  for (const attribute of ["data-large", "data-original", "data-full", "data-zoom-image", "data-src", "src"]) {
+    for (const match of markup.matchAll(new RegExp(`${attribute}=["']([^"']+)`, "gi"))) {
+      add(match[1]);
+    }
+  }
+
+  candidates.sort((a, b) => b.score - a.score);
+  return candidates[0]?.url || "";
+}
+
+function parseSrcsetCandidates(value, pageUrl) {
+  return String(value ?? "")
+    .split(",")
+    .map((part) => {
+      const [urlPart, descriptor = ""] = part.trim().split(/\s+/);
+      const descriptorScore = /(\d+)w/i.test(descriptor)
+        ? Number(descriptor.match(/(\d+)w/i)?.[1] || 0)
+        : /(\d+(?:\.\d+)?)x/i.test(descriptor)
+          ? Number(descriptor.match(/(\d+(?:\.\d+)?)x/i)?.[1] || 0) * 400
+          : 0;
+      return {
+        url: normalizeImageCandidateUrl(urlPart, pageUrl),
+        score: descriptorScore,
+      };
+    })
+    .filter((candidate) => candidate.url);
+}
+
+function normalizeImageCandidateUrl(value, pageUrl) {
+  const decoded = decodeHtmlEntities(String(value ?? "").trim());
+  if (!decoded || decoded.startsWith("data:") || /\.svg(?:[?#]|$)/i.test(decoded)) return "";
+
+  try {
+    const url = new URL(decoded.startsWith("//") ? `https:${decoded}` : decoded, pageUrl).href;
+    if (!/^https?:/i.test(url)) return "";
+    if (/(?:logo|icon|sprite|favicon|placeholder)/i.test(url)) return "";
+    return url;
+  } catch {
+    return "";
+  }
+}
+
+function scoreImageCandidate(url, descriptorScore = 0) {
+  const dimensionScore = Math.max(
+    ...[...String(url).matchAll(/(?:^|[^0-9])(\d{2,5})[x_-](\d{2,5})(?:[^0-9]|$)/g)].map(
+      (match) => Number(match[1]) * Number(match[2]),
+    ),
+    ...[...String(url).matchAll(/w(\d{2,5})h(\d{2,5})/gi)].map(
+      (match) => Number(match[1]) * Number(match[2]),
+    ),
+    0,
+  );
+  const largePathBonus = /(?:original|large|zoom|full|1000|1200|1500|2000)/i.test(url) ? 100000 : 0;
+  const thumbnailPenalty = /(?:thumb|thumbnail|small|preview|\/s\d+_|_s\d+|150x150|80x80)/i.test(url)
+    ? -100000
+    : 0;
+
+  return dimensionScore + descriptorScore + largePathBonus + thumbnailPenalty;
+}
+
 async function extractPicturesFromPage(url, browserEngine = "chromium") {
   try {
     const response = await scrapePage(url, { engine: browserEngine, waitAfterLoadMs: 750 });
diff --git a/test/idealo-picture-parser.test.ts b/test/idealo-picture-parser.test.ts
new file mode 100644
index 0000000..cda5116
--- /dev/null
+++ b/test/idealo-picture-parser.test.ts
@@ -0,0 +1,33 @@
+// @ts-nocheck
+import test from "node:test";
+import assert from "node:assert/strict";
+import { extractIdealoGalleryPictureUrls } from "../src/services/catalog-products.ts";
+
+test("idealo gallery parser prefers large splide images over thumbnails", () => {
+  const html = `
+    <div class="splide__track container">
+      <ul class="splide__list">
+        <li class="splide__slide">
+          <img
+            src="//img.idealo.com/folder/Product/200123/4/200123456/s1_product_thumb.jpg"
+            srcset="//img.idealo.com/folder/Product/200123/4/200123456/s1_product_150x150.jpg 150w,
+                    //img.idealo.com/folder/Product/200123/4/200123456/s1_product_1000x1000.jpg 1000w">
+        </li>
+        <li class="splide__slide">
+          <picture>
+            <source srcset="//img.idealo.com/folder/Product/200123/4/200123456/s2_product_400x400.jpg 400w,
+                            //img.idealo.com/folder/Product/200123/4/200123456/s2_product_1200x1200.jpg 1200w">
+            <img src="//img.idealo.com/folder/Product/200123/4/200123456/s2_product_80x80.jpg">
+          </picture>
+        </li>
+      </ul>
+    </div>`;
+
+  const urls = extractIdealoGalleryPictureUrls(html, "https://www.idealo.de/product.html");
+
+  assert.deepEqual(urls, [
+    "https://img.idealo.com/folder/Product/200123/4/200123456/s1_product_1000x1000.jpg",
+    "https://img.idealo.com/folder/Product/200123/4/200123456/s2_product_1200x1200.jpg",
+  ]);
+});
+