diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 04658f8..91597f3 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -2,7 +2,8 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="89f9fc3a-63ad-41cb-8d25-f07df352eb98" name="Changes" comment="">
-      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/package.json" beforeDir="false" afterPath="$PROJECT_DIR$/package.json" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pnpm-lock.yaml" beforeDir="false" afterPath="$PROJECT_DIR$/pnpm-lock.yaml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/src/routes/+page.svelte" beforeDir="false" afterPath="$PROJECT_DIR$/src/routes/+page.svelte" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
@@ -49,7 +50,7 @@
       <option name="presentableId" value="Default" />
       <updated>1781169139290</updated>
       <workItem from="1781169141138" duration="309000" />
-      <workItem from="1781251694220" duration="5262000" />
+      <workItem from="1781251694220" duration="5995000" />
     </task>
     <task id="LOCAL-00001" summary="adapts styling of rvg.legal">
       <option name="closed" value="true" />
@@ -59,7 +60,15 @@
       <option name="project" value="LOCAL" />
       <updated>1781256112218</updated>
     </task>
-    <option name="localTasksCounter" value="2" />
+    <task id="LOCAL-00002" summary="adds dropzone to add zips">
+      <option name="closed" value="true" />
+      <created>1781257473070</created>
+      <option name="number" value="00002" />
+      <option name="presentableId" value="LOCAL-00002" />
+      <option name="project" value="LOCAL" />
+      <updated>1781257473070</updated>
+    </task>
+    <option name="localTasksCounter" value="3" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -70,7 +79,8 @@
   <component name="VcsManagerConfiguration">
     <option name="CLEAR_INITIAL_COMMIT_MESSAGE" value="true" />
     <MESSAGE value="adapts styling of rvg.legal" />
-    <option name="LAST_COMMIT_MESSAGE" value="adapts styling of rvg.legal" />
+    <MESSAGE value="adds dropzone to add zips" />
+    <option name="LAST_COMMIT_MESSAGE" value="adds dropzone to add zips" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>
diff --git a/package.json b/package.json
index ed546a6..57060a1 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,7 @@
 	},
 	"dependencies": {
 		"@skeletonlabs/skeleton": "^4.15.2",
-		"@skeletonlabs/skeleton-svelte": "^4.15.2"
+		"@skeletonlabs/skeleton-svelte": "^4.15.2",
+		"fflate": "^0.8.3"
 	}
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 32f3ff5..7eeef8e 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -14,6 +14,9 @@ importers:
       '@skeletonlabs/skeleton-svelte':
         specifier: ^4.15.2
         version: 4.15.2(svelte@5.56.3)
+      fflate:
+        specifier: ^0.8.3
+        version: 0.8.3
     devDependencies:
       '@sveltejs/adapter-auto':
         specifier: ^7.0.1
@@ -594,6 +597,9 @@ packages:
       picomatch:
         optional: true
 
+  fflate@0.8.3:
+    resolution: {integrity: sha512-tbZNuJrLwGUp3zshBtdy4W+ORxZuIh8a5ilyIEQDC5rY1f3U20JMry0Ll3WBzU58EZKsEuJFXhb5gwv8CsPvgA==}
+
   fsevents@2.3.3:
     resolution: {integrity: sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==}
     engines: {node: ^8.16.0 || ^10.6.0 || >=11.0.0}
@@ -1570,6 +1576,8 @@ snapshots:
     optionalDependencies:
       picomatch: 4.0.4
 
+  fflate@0.8.3: {}
+
   fsevents@2.3.3:
     optional: true
 
diff --git a/src/lib/zip-processing.ts b/src/lib/zip-processing.ts
new file mode 100644
index 0000000..fadcdff
--- /dev/null
+++ b/src/lib/zip-processing.ts
@@ -0,0 +1,99 @@
+import { unzip } from "fflate";
+
+export type ZipAttachmentKind = "pdf" | "image";
+
+export type ZipAttachment = {
+	name: string;
+	path: string;
+	kind: ZipAttachmentKind;
+	data: Uint8Array;
+};
+
+export type ProcessedZipArchive = {
+	name: string;
+	attachments: ZipAttachment[];
+	xjustizNachrichtXml: Uint8Array | null;
+};
+
+const IMAGE_EXTENSIONS = new Set([
+	".avif",
+	".bmp",
+	".gif",
+	".heic",
+	".jpeg",
+	".jpg",
+	".jp2",
+	".png",
+	".tif",
+	".tiff",
+	".webp",
+]);
+
+const ZIP_META_FILE_NAME = "xjustiz_nachricht.xml";
+
+const unzipArchive = (data: Uint8Array) =>
+	new Promise<Record<string, Uint8Array>>((resolve, reject) => {
+		unzip(data, (error, files) => {
+			if (error) {
+				reject(error);
+				return;
+			}
+
+			resolve(files);
+		});
+	});
+
+const getBaseName = (path: string) => path.split("/").pop() ?? path;
+
+const getExtension = (path: string) => {
+	const baseName = getBaseName(path).toLowerCase();
+	const lastDotIndex = baseName.lastIndexOf(".");
+
+	return lastDotIndex === -1 ? "" : baseName.slice(lastDotIndex);
+};
+
+const isPdf = (path: string) => getExtension(path) === ".pdf";
+
+const isImage = (path: string) => IMAGE_EXTENSIONS.has(getExtension(path));
+
+export const extractZipArchive = async (file: File): Promise<ProcessedZipArchive> => {
+	const archiveBytes = new Uint8Array(await file.arrayBuffer());
+	const files = await unzipArchive(archiveBytes);
+
+	const attachments: ZipAttachment[] = [];
+	let xjustizNachrichtXml: Uint8Array | null = null;
+
+	for (const [path, data] of Object.entries(files)) {
+		const baseName = getBaseName(path);
+
+		if (baseName.toLowerCase() === ZIP_META_FILE_NAME) {
+			xjustizNachrichtXml = data;
+			continue;
+		}
+
+		if (isPdf(path)) {
+			attachments.push({
+				name: baseName,
+				path,
+				kind: "pdf",
+				data,
+			});
+			continue;
+		}
+
+		if (isImage(path)) {
+			attachments.push({
+				name: baseName,
+				path,
+				kind: "image",
+				data,
+			});
+		}
+	}
+
+	return {
+		name: file.name,
+		attachments,
+		xjustizNachrichtXml,
+	};
+};
diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
index 8db6d11..4a7adbe 100644
--- a/src/routes/+page.svelte
+++ b/src/routes/+page.svelte
@@ -1,11 +1,32 @@
 <script lang="ts">
     import Card from "$lib/components/Card.svelte";
     import ZipDropzone from "$lib/components/ZipDropzone.svelte";
+    import { extractZipArchive, type ProcessedZipArchive } from "$lib/zip-processing";
 
     let selectedZipFiles: File[] = $state([]);
+    let processedZipFiles: ProcessedZipArchive[] = $state([]);
+    let pendingZipCount = $state(0);
 
     const handleFilesSelected = (files: File[]) => {
         selectedZipFiles = [...selectedZipFiles, ...files];
+
+        for (const file of files) {
+            void processZipFile(file);
+        }
+    };
+
+    const processZipFile = async (file: File) => {
+        pendingZipCount += 1;
+
+        try {
+            const processedZipArchive = await extractZipArchive(file);
+            processedZipArchive.xjustizNachrichtXml
+            processedZipFiles = [...processedZipFiles, processedZipArchive];
+        } catch (error) {
+            console.error(`Failed to process ${file.name}`, error);
+        } finally {
+            pendingZipCount -= 1;
+        }
     };
 </script>
 
@@ -15,16 +36,31 @@
     {:else}
         <div class="flex min-h-[calc(-180px+100vh)] w-full grow flex-col justify-center gap-4 px-4 py-6">
             <div class="flex flex-row items-baseline justify-center gap-2">
-                <h2 class="h1 text-[20px] font-bold text-primary-900">ZIP-Dateien geladen</h2>
+                <h2 class="h1 text-[20px] font-bold text-primary-900">ZIP-Dateien werden verarbeitet</h2>
             </div>
 
-            <ul class="mx-auto w-full max-w-3xl space-y-2">
-                {#each selectedZipFiles as file}
-                    <li class="rounded-container bg-primary-50 px-4 py-3 text-[14px] font-medium text-primary-900">
-                        {file.name}
-                    </li>
-                {/each}
-            </ul>
+            <div class="mx-auto flex w-full max-w-3xl flex-col gap-3">
+                <div class="rounded-container bg-primary-50 px-4 py-3 text-[14px] font-medium text-primary-900">
+                    {#if pendingZipCount > 0}
+                        Noch {pendingZipCount} ZIP-Datei{pendingZipCount === 1 ? "" : "en"} in Bearbeitung.
+                    {:else}
+                        Alle ZIP-Dateien wurden verarbeitet.
+                    {/if}
+                </div>
+
+                {#if processedZipFiles.length > 0}
+                    <ul class="space-y-2">
+                        {#each processedZipFiles as file}
+                            <li class="rounded-container bg-primary-50 px-4 py-3 text-[14px] font-medium text-primary-900">
+                                {file.name} - {file.attachments.length} relevante Datei{file.attachments.length === 1 ? "" : "en"}
+                                {#if file.xjustizNachrichtXml}
+                                    - xjustiz_nachricht.xml vorhanden
+                                {/if}
+                            </li>
+                        {/each}
+                    </ul>
+                {/if}
+            </div>
         </div>
     {/if}
 {/snippet}