diff --git a/assets/logo.png b/assets/logo.png
new file mode 100644
index 0000000..01d3128
Binary files /dev/null and b/assets/logo.png differ
diff --git a/pdf.js b/pdf.js
index 2162e5b..d4b7b3a 100644
--- a/pdf.js
+++ b/pdf.js
@@ -94,20 +94,24 @@
     return '';
   }
 
-  // Load the bundled header logo (JPEG) in the extension background page.
-  // Returns null in Node (tests) or if the asset is unavailable.
+  // Load the bundled header logo. Prefer the transparent PNG (matches the
+  // official PDF, which masks the JPEG's baked-in background) for a clean
+  // look on white; fall back to the JPEG in Node (tests) or if unavailable.
   async function loadLogo() {
-    try {
-      const url = (typeof browser !== 'undefined' && browser.runtime && browser.runtime.getURL)
-        ? browser.runtime.getURL('assets/logo.jpeg')
-        : null;
-      if (!url) return null;
-      const resp = await fetch(url);
-      if (!resp.ok) return null;
-      return new Uint8Array(await resp.arrayBuffer());
-    } catch (e) {
-      return null;
+    const ext = (typeof browser !== 'undefined' && browser.runtime && browser.runtime.getURL);
+    const candidates = ['assets/logo.png', 'assets/logo.jpeg'];
+    for (const asset of candidates) {
+      try {
+        const url = ext ? browser.runtime.getURL(asset) : null;
+        if (!url) return null;
+        const resp = await fetch(url);
+        if (!resp.ok) continue;
+        return { bytes: new Uint8Array(await resp.arrayBuffer()), transparent: /logo\.png$/.test(asset) };
+      } catch (e) {
+        continue;
+      }
     }
+    return null;
   }
 
   // Builds a Letter-size PDF replicating the official ISMIS Study Load layout:
@@ -134,10 +138,16 @@
     const black = rgb(0, 0, 0);
     const gray = rgb(0.3, 0.3, 0.3);
 
-    const logoBytes = await loadLogo();
+    const logo = await loadLogo();
     let logoImg = null;
-    if (logoBytes) {
-      try { logoImg = await doc.embedJpg(logoBytes); } catch (e) { logoImg = null; }
+    if (logo) {
+      try {
+        // Transparent PNG embeds with an alpha mask (matches official PDF);
+        // the JPEG is embedded as-is (no mask).
+        logoImg = logo.transparent
+          ? await doc.embedPng(logo.bytes)
+          : await doc.embedJpg(logo.bytes);
+      } catch (e) { logoImg = null; }
     }
 
     function center(text, size, f, dy) {