diff --git a/DEPLOY.md b/DEPLOY.md
index 52d9173..ecd2c1c 100644
--- a/DEPLOY.md
+++ b/DEPLOY.md
@@ -23,7 +23,7 @@ rsync -av backend/url-shortener/ alpine-be:/var/www/localhost/htdocs/apps/s/
 cd /var/www/.../androidcast_project/android_cast
 php81 examples/crash_reporter/backend/scripts/ensure_url_shortener_prod_config.php
 
-apk add libqrencode-tools   # QR PNG (/api/v1/qr/…)
+apk add libqrencode-tools php83-gd   # QR PNG (/api/v1/qr/…) + logo overlay
 rc-service php-fpm81 restart
 ```
 
diff --git a/assets/ac_qr_logo.png b/assets/ac_qr_logo.png
index d95f9cb..c8c2e3a 100644
Binary files a/assets/ac_qr_logo.png and b/assets/ac_qr_logo.png differ
diff --git a/src/QrBrandedRenderer.php b/src/QrBrandedRenderer.php
index 1ca612f..5d11126 100644
--- a/src/QrBrandedRenderer.php
+++ b/src/QrBrandedRenderer.php
@@ -3,8 +3,8 @@ declare(strict_types=1);
 
 /** Branded QR PNG: high error correction + centered app logo with white border. */
 final class QrBrandedRenderer {
-    private const LOGO_FRACTION = 0.22;
-    private const BORDER_FRACTION = 0.045;
+    private const LOGO_FRACTION = 0.24;
+    private const BORDER_FRACTION = 0.05;
 
     private function __construct() {
     }
@@ -22,12 +22,36 @@ final class QrBrandedRenderer {
         return $branded ?? $raw;
     }
 
+    public static function dataUri(string $text, int $size = 256): ?string {
+        $png = self::renderPng($text, $size);
+        if ($png === null) {
+            return null;
+        }
+        return 'data:image/png;base64,' . base64_encode($png);
+    }
+
     /** @return list<string> */
     private static function logoCandidates(): array {
-        return [
-            dirname(__DIR__) . '/assets/ac_qr_logo.png',
-            __DIR__ . '/../assets/ac_qr_logo.png',
-        ];
+        $paths = [];
+        $env = getenv('AC_QR_LOGO_PATH');
+        if (is_string($env) && $env !== '') {
+            $paths[] = $env;
+        }
+        $paths[] = dirname(__DIR__) . '/assets/ac_qr_logo.png';
+        $paths[] = __DIR__ . '/../assets/ac_qr_logo.png';
+        $paths[] = dirname(__DIR__, 2) . '/ac-platform-php/assets/ac_qr_logo.png';
+        $paths[] = dirname(__DIR__, 2) . '/ac-platform-php/public/assets/ac_qr_logo.png';
+        return $paths;
+    }
+
+    /** @return \GdImage|false */
+    private static function loadLogoImage(string $path) {
+        $bytes = @file_get_contents($path);
+        if (!is_string($bytes) || $bytes === '') {
+            return false;
+        }
+        $img = @imagecreatefromstring($bytes);
+        return $img !== false ? $img : false;
     }
 
     private static function logoPath(): ?string {
@@ -71,7 +95,7 @@ final class QrBrandedRenderer {
         if ($qr === false) {
             return null;
         }
-        $logo = @imagecreatefrompng($logoPath);
+        $logo = self::loadLogoImage($logoPath);
         if ($logo === false) {
             imagedestroy($qr);
             return null;