diff --git a/src/Bundle/ChillDocStoreBundle/AsyncUpload/SignedUrl.php b/src/Bundle/ChillDocStoreBundle/AsyncUpload/SignedUrl.php
index 583325a26..9003a69ea 100644
--- a/src/Bundle/ChillDocStoreBundle/AsyncUpload/SignedUrl.php
+++ b/src/Bundle/ChillDocStoreBundle/AsyncUpload/SignedUrl.php
@@ -11,11 +11,28 @@ declare(strict_types=1);
 
 namespace Chill\DocStoreBundle\AsyncUpload;
 
+use Symfony\Component\Serializer\Annotation as Serializer;
+
 readonly class SignedUrl
 {
     public function __construct(
+        /**
+         * @Serializer\Groups({"read"})
+         */
         public string $method,
+
+        /**
+         * @Serializer\Groups({"read"})
+         */
         public string $url,
         public \DateTimeImmutable $expires,
     ) {}
+
+    /**
+     * @Serializer\Groups({"read"})
+     */
+    public function getExpires(): int
+    {
+        return $this->expires->getTimestamp();
+    }
 }
diff --git a/src/Bundle/ChillDocStoreBundle/AsyncUpload/SignedUrlPost.php b/src/Bundle/ChillDocStoreBundle/AsyncUpload/SignedUrlPost.php
index 98e273635..4a5b4e0fb 100644
--- a/src/Bundle/ChillDocStoreBundle/AsyncUpload/SignedUrlPost.php
+++ b/src/Bundle/ChillDocStoreBundle/AsyncUpload/SignedUrlPost.php
@@ -11,16 +11,42 @@ declare(strict_types=1);
 
 namespace Chill\DocStoreBundle\AsyncUpload;
 
+use Symfony\Component\Serializer\Annotation as Serializer;
+
 readonly class SignedUrlPost extends SignedUrl
 {
     public function __construct(
         string $url,
         \DateTimeImmutable $expires,
+
+        /**
+         * @Serializer\Groups({"read"})
+         */
         public int $max_file_size,
+
+        /**
+         * @Serializer\Groups({"read"})
+         */
         public int $max_file_count,
+
+        /**
+         * @Serializer\Groups({"read"})
+         */
         public int $submit_delay,
+
+        /**
+         * @Serializer\Groups({"read"})
+         */
         public string $redirect,
+
+        /**
+         * @Serializer\Groups({"read"})
+         */
         public string $prefix,
+
+        /**
+         * @Serializer\Groups({"read"})
+         */
         public string $signature,
     ) {
         parent::__construct('POST', $url, $expires);
diff --git a/src/Bundle/ChillDocStoreBundle/Tests/Serializer/Normalizer/SignedUrlNormalizerTest.php b/src/Bundle/ChillDocStoreBundle/Tests/Serializer/Normalizer/SignedUrlNormalizerTest.php
new file mode 100644
index 000000000..8cf9c5a6d
--- /dev/null
+++ b/src/Bundle/ChillDocStoreBundle/Tests/Serializer/Normalizer/SignedUrlNormalizerTest.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\DocStoreBundle\Tests\Serializer\Normalizer;
+
+use Chill\DocStoreBundle\AsyncUpload\SignedUrl;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+use Symfony\Component\Serializer\Normalizer\AbstractNormalizer;
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
+
+/**
+ * @internal
+ *
+ * @coversNothing
+ */
+class SignedUrlNormalizerTest extends KernelTestCase
+{
+    public static NormalizerInterface $normalizer;
+
+    public static function setUpBeforeClass(): void
+    {
+        parent::setUpBeforeClass();
+
+        self::bootKernel();
+        self::$normalizer = self::$container->get(NormalizerInterface::class);
+    }
+
+    public function testNormalizerSignedUrl(): void
+    {
+        $signedUrl = new SignedUrl(
+            'GET',
+            'https://object.store.example/container/object',
+            \DateTimeImmutable::createFromFormat('U', '1700000')
+        );
+
+        $actual = self::$normalizer->normalize($signedUrl, 'json', [AbstractNormalizer::GROUPS => ['read']]);
+
+        self::assertEqualsCanonicalizing(
+            [
+                'method' => 'GET',
+                'expires' => 1_700_000,
+                'url' => 'https://object.store.example/container/object',
+            ],
+            $actual
+        );
+    }
+}
diff --git a/src/Bundle/ChillDocStoreBundle/Tests/Serializer/Normalizer/SignedUrlPostNormalizerTest.php b/src/Bundle/ChillDocStoreBundle/Tests/Serializer/Normalizer/SignedUrlPostNormalizerTest.php
new file mode 100644
index 000000000..3d510d22b
--- /dev/null
+++ b/src/Bundle/ChillDocStoreBundle/Tests/Serializer/Normalizer/SignedUrlPostNormalizerTest.php
@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\DocStoreBundle\Tests\Serializer\Normalizer;
+
+use Chill\DocStoreBundle\AsyncUpload\SignedUrlPost;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+use Symfony\Component\Serializer\Normalizer\AbstractNormalizer;
+use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
+
+/**
+ * @internal
+ *
+ * @coversNothing
+ */
+class SignedUrlPostNormalizerTest extends KernelTestCase
+{
+    public static NormalizerInterface $normalizer;
+
+    public static function setUpBeforeClass(): void
+    {
+        parent::setUpBeforeClass();
+
+        self::bootKernel();
+        self::$normalizer = self::$container->get(NormalizerInterface::class);
+    }
+
+    public function testNormalizerSignedUrl(): void
+    {
+        $signedUrl = new SignedUrlPost(
+            'https://object.store.example/container/object',
+            \DateTimeImmutable::createFromFormat('U', '1700000'),
+            15000,
+            1,
+            180,
+            '',
+            'abc',
+            'SiGnaTure'
+        );
+
+        $actual = self::$normalizer->normalize($signedUrl, 'json', [AbstractNormalizer::GROUPS => ['read']]);
+
+        self::assertEqualsCanonicalizing(
+            [
+                'max_file_size' => 15000,
+                'max_file_count' => 1,
+                'submit_delay' => 180,
+                'redirect' => '',
+                'prefix' => 'abc',
+                'signature' => 'SiGnaTure',
+                'method' => 'POST',
+                'expires' => 1_700_000,
+                'url' => 'https://object.store.example/container/object',
+            ],
+            $actual
+        );
+    }
+}