diff --git a/app/Contribution/ContributionController.php b/app/Contribution/ContributionController.php
index 5c30147d..12c51fc5 100644
--- a/app/Contribution/ContributionController.php
+++ b/app/Contribution/ContributionController.php
@@ -5,6 +5,7 @@ namespace App\Contribution;
 use App\Contribution\Documents\SolingenDocument;
 use App\Http\Controllers\Controller;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Validator;
 use Zoomyboy\Tex\BaseCompiler;
 use Zoomyboy\Tex\Tex;
 
@@ -12,9 +13,22 @@ class ContributionController extends Controller
 {
     public function generate(Request $request): BaseCompiler
     {
-        /** @var class-string<SolingenDocument> */
-        $type = $request->query('type');
+        $payload = json_decode(base64_decode($request->input('payload', '')), true);
 
-        return Tex::compile($type::fromRequest($request));
+        $validated = Validator::make($payload, [
+            'dateFrom' => 'required|date|date_format:Y-m-d',
+            'dateUntil' => 'required|date|date_format:Y-m-d',
+            'country' => 'required|exists:countries,id',
+            'eventName' => 'required|max:100',
+            'members' => 'array',
+            'members.*' => 'integer|exists:members,id',
+            'type' => 'required|string',
+            'zipLocation' => 'required|string',
+        ])->validate();
+
+        /** @var class-string<SolingenDocument> */
+        $type = $validated['type'];
+
+        return Tex::compile($type::fromRequest($validated));
     }
 }
diff --git a/app/Contribution/Documents/DvDocument.php b/app/Contribution/Documents/DvDocument.php
index c55736c7..5fd9b094 100644
--- a/app/Contribution/Documents/DvDocument.php
+++ b/app/Contribution/Documents/DvDocument.php
@@ -6,7 +6,6 @@ use App\Country;
 use App\Member\Member;
 use Carbon\Carbon;
 use Illuminate\Support\Collection;
-use Illuminate\Http\Request;
 use Zoomyboy\Tex\Engine;
 use Zoomyboy\Tex\Template;
 
@@ -33,14 +32,17 @@ class DvDocument extends ContributionDocument
             .Carbon::parse($this->dateUntil)->format('d.m.Y');
     }
 
-    public static function fromRequest(Request $request): self
+    /**
+     * @param array<string, string|int> $request
+     */
+    public static function fromRequest(array $request): self
     {
         return new self(
-            dateFrom: $request->dateFrom,
-            dateUntil: $request->dateUntil,
-            zipLocation: $request->zipLocation,
-            country: Country::where('id', $request->country)->firstOrFail(),
-            members: Member::whereIn('id', $request->members)->orderByRaw('lastname, firstname')->get()->toBase()->chunk(17),
+            dateFrom: $request['dateFrom'],
+            dateUntil: $request['dateUntil'],
+            zipLocation: $request['zipLocation'],
+            country: Country::where('id', $request['country'])->firstOrFail(),
+            members: Member::whereIn('id', $request['members'])->orderByRaw('lastname, firstname')->get()->toBase()->chunk(17),
         );
     }
 
diff --git a/app/Contribution/Documents/RemscheidDocument.php b/app/Contribution/Documents/RemscheidDocument.php
index 81a1dd80..18460f89 100644
--- a/app/Contribution/Documents/RemscheidDocument.php
+++ b/app/Contribution/Documents/RemscheidDocument.php
@@ -6,7 +6,6 @@ use App\Country;
 use App\Member\Member;
 use Carbon\Carbon;
 use Illuminate\Support\Collection;
-use Illuminate\Http\Request;
 use Zoomyboy\Tex\Engine;
 use Zoomyboy\Tex\Template;
 
@@ -38,15 +37,18 @@ class RemscheidDocument extends ContributionDocument
         return Carbon::parse($this->dateUntil)->format('d.m.Y');
     }
 
-    public static function fromRequest(Request $request): self
+    /**
+     * @param array<string, string|int> $request
+     */
+    public static function fromRequest(array $request): self
     {
-        [$leaders, $children] = Member::whereIn('id', $request->members)->orderByRaw('lastname, firstname')->get()->partition(fn ($member) => $member->isLeader());
+        [$leaders, $children] = Member::whereIn('id', $request['members'])->orderByRaw('lastname, firstname')->get()->partition(fn ($member) => $member->isLeader());
 
         return new self(
-            dateFrom: $request->dateFrom,
-            dateUntil: $request->dateUntil,
-            zipLocation: $request->zipLocation,
-            country: Country::where('id', $request->country)->firstOrFail(),
+            dateFrom: $request['dateFrom'],
+            dateUntil: $request['dateUntil'],
+            zipLocation: $request['zipLocation'],
+            country: Country::where('id', $request['country'])->firstOrFail(),
             leaders: $leaders->values()->toBase()->chunk(6),
             children: $children->values()->toBase()->chunk(20),
         );
diff --git a/app/Contribution/Documents/SolingenDocument.php b/app/Contribution/Documents/SolingenDocument.php
index 7bc8f8fe..5217a944 100644
--- a/app/Contribution/Documents/SolingenDocument.php
+++ b/app/Contribution/Documents/SolingenDocument.php
@@ -5,7 +5,6 @@ namespace App\Contribution\Documents;
 use App\Member\Member;
 use Carbon\Carbon;
 use Illuminate\Support\Collection;
-use Illuminate\Http\Request;
 use Illuminate\Support\Str;
 use Zoomyboy\Tex\Engine;
 use Zoomyboy\Tex\Template;
@@ -25,14 +24,17 @@ class SolingenDocument extends ContributionDocument
     ) {
     }
 
-    public static function fromRequest(Request $request): static
+    /**
+     * @param array<string, mixed|int> $request
+     */
+    public static function fromRequest(array $request): static
     {
         return new static(
-            dateFrom: $request->dateFrom,
-            dateUntil: $request->dateUntil,
-            zipLocation: $request->zipLocation,
-            members: $request->members,
-            eventName: $request->eventName,
+            dateFrom: $request['dateFrom'],
+            dateUntil: $request['dateUntil'],
+            zipLocation: $request['zipLocation'],
+            members: $request['members'],
+            eventName: $request['eventName'],
         );
     }
 
diff --git a/resources/js/views/contribution/VIndex.vue b/resources/js/views/contribution/VIndex.vue
index 2bc36da4..11a94aef 100644
--- a/resources/js/views/contribution/VIndex.vue
+++ b/resources/js/views/contribution/VIndex.vue
@@ -1,32 +1,11 @@
 <template>
-    <form action="/contribution/generate" target="_BLANK" class="max-w-4xl w-full mx-auto gap-6 grid-cols-2 grid p-6">
-        <f-text
-            id="eventName"
-            name="eventName"
-            class="col-span-2"
-            v-model="values.eventName"
-            label="Veranstaltungs-Name"
-            required
-        ></f-text>
+    <form target="_BLANK" class="max-w-4xl w-full mx-auto gap-6 grid-cols-2 grid p-6">
+        <f-text id="eventName" name="eventName" class="col-span-2" v-model="values.eventName" label="Veranstaltungs-Name" required></f-text>
         <f-text id="dateFrom" name="dateFrom" type="date" v-model="values.dateFrom" label="Datum von" required></f-text>
-        <f-text
-            id="dateUntil"
-            name="dateUntil"
-            type="date"
-            v-model="values.dateUntil"
-            label="Datum bis"
-            required
-        ></f-text>
+        <f-text id="dateUntil" name="dateUntil" type="date" v-model="values.dateUntil" label="Datum bis" required></f-text>
 
         <f-text id="zipLocation" name="zipLocation" v-model="values.zipLocation" label="PLZ / Ort" required></f-text>
-        <f-select
-            id="country"
-            :options="countries"
-            name="country"
-            v-model="values.country"
-            label="Land"
-            required
-        ></f-select>
+        <f-select id="country" :options="countries" name="country" v-model="values.country" label="Land" required></f-select>
 
         <div class="border-gray-200 shadow shadow-primary-700 p-3 shadow-[0_0_4px_gray] col-span-2">
             <f-text
@@ -57,10 +36,10 @@
 
         <button
             v-for="(compiler, index) in compilers"
-            target="_BLANK"
-            type="submit"
-            name="type"
-            :value="compiler.class"
+            @click.prevent="
+                values.type = compiler.class;
+                submit();
+            "
             class="btn btn-primary mt-3 inline-block"
             v-text="compiler.title"
         ></button>
@@ -78,6 +57,7 @@ export default {
                 results: [],
             },
             values: {
+                type: null,
                 members: [],
                 event_name: '',
                 dateFrom: '',
@@ -98,7 +78,7 @@ export default {
             get() {
                 return this.search.s;
             },
-            set: debounce(async function(event) {
+            set: debounce(async function (event) {
                 this.search.s = event;
 
                 var response = await this.axios.post('/api/member/search', {search: event, minLength: 3});
@@ -108,6 +88,10 @@ export default {
         },
     },
     methods: {
+        submit() {
+            var payload = btoa(JSON.stringify(this.values));
+            window.open(`/contribution/generate?payload=${payload}`);
+        },
         onSubmitMemberResult(selected) {
             if (this.values.members.find((m) => m === selected.id) !== undefined) {
                 this.values.members = this.values.members.filter((m) => m === selected.id);
@@ -127,6 +111,5 @@ export default {
             this.onSubmitMemberResult(this.search.results[0]);
         },
     },
-
 };
 </script>
diff --git a/tests/Feature/Contribution/StoreTest.php b/tests/Feature/Contribution/StoreTest.php
index 811a6279..645a3611 100644
--- a/tests/Feature/Contribution/StoreTest.php
+++ b/tests/Feature/Contribution/StoreTest.php
@@ -2,6 +2,7 @@
 
 namespace Tests\Feature\Contribution;
 
+use App\Contribution\Documents\SolingenDocument;
 use App\Country;
 use App\Member\Member;
 use Illuminate\Foundation\Testing\DatabaseTransactions;
@@ -29,17 +30,40 @@ class StoreTest extends TestCase
         $member2 = Member::factory()->defaults()->create(['address' => 'Maxstr 44', 'zip' => '42719', 'firstname' => 'Jane', 'lastname' => 'Muster']);
 
         $response = $this->call('GET', '/contribution/generate', [
-            'country' => $country->id,
-            'dateFrom' => '1991-06-15',
-            'dateUntil' => '1991-06-16',
-            'eventName' => 'Super tolles Lager',
-            'members' => [$member1->id, $member2->id],
-            'type' => $type,
-            'zipLocation' => '42777 SG',
+            'payload' => base64_encode(json_encode([
+                'country' => $country->id,
+                'dateFrom' => '1991-06-15',
+                'dateUntil' => '1991-06-16',
+                'eventName' => 'Super tolles Lager',
+                'members' => [$member1->id, $member2->id],
+                'type' => $type,
+                'zipLocation' => '42777 SG',
+            ])),
         ]);
 
         $response->assertSessionDoesntHaveErrors();
         $response->assertOk();
         Tex::assertCompiled($type, fn ($document) => $document->hasAllContent($bodyChecks));
     }
+
+    public function testItValidatesInput(): void
+    {
+        $this->login()->loginNami();
+        $country = Country::factory()->create();
+        $member1 = Member::factory()->defaults()->create();
+
+        $response = $this->call('GET', '/contribution/generate', [
+            'payload' => base64_encode(json_encode([
+                'country' => $country->id,
+                'dateFrom' => '',
+                'dateUntil' => '1991-06-16',
+                'eventName' => 'Super tolles Lager',
+                'members' => [$member1->id],
+                'type' => SolingenDocument::class,
+                'zipLocation' => '42777 SG',
+            ])),
+        ]);
+
+        $response->assertSessionHasErrors('dateFrom');
+    }
 }