diff --git a/frontend/src/routes/task/Index.svelte b/frontend/src/routes/task/Index.svelte
index 28de894..91c0bd2 100644
--- a/frontend/src/routes/task/Index.svelte
+++ b/frontend/src/routes/task/Index.svelte
@@ -7,6 +7,8 @@
     import { t }             from '../../translations.svelte.js';
 
     let filter = $state(null);
+    let lower_filter = $derived(filter.toLowerCase());
+    let inverted_filter = $state(false);
     let projects = $state({});
     let router = useTinyRouter();
     let tasks = $state(null);
@@ -46,7 +48,16 @@
     }
 
     function filterApplies(task){
-        return true;
+        if (!filter) return !inverted_filter;
+        if (task.name.toLowerCase().includes(lower_filter)) return !inverted_filter;
+        if (task.description.source.toLowerCase().includes(lower_filter)) return !inverted_filter;
+        if (projects[task.project_id].name.toLowerCase().includes(lower_filter)) return !inverted_filter;
+        if (task.parent_task_id){
+            const parent = map[task.parent_task_id];
+            if (parent && parent.name.toLowerCase().includes(lower_filter)) return !inverted_filter;
+        }
+
+        return inverted_filter;
     }
 
     function go(module, id){
@@ -112,6 +123,12 @@
         <label>
             {t('filter')}: <input type="text" bind:value={filter} >
         </label>
+        {#if filter}
+        <label>
+            <input type="checkbox" bind:checked={inverted_filter} />
+            {t('invert_filter')}
+        </label>
+        {/if}
     </div>
     {#if tasks}
     <table>
@@ -148,7 +165,7 @@
                 <td>
                     <button class="symbol" onclick={() => edit(task.id)} title={t('edit')} ></button>
                     <button class="symbol" onclick={() => postpone(idx)} title={t('postpone')} ></button>
-                    <button class="symbol" onclick={() => open(idx)} title={t('open')}></button>
+                    <button class="symbol" onclick={() => open(idx)} title={t('state_open')}></button>
                     <button class="symbol" onclick={() => start(idx)} title={t('start')} ></button>
                     <button class="symbol" onclick={() => complete(idx)} title={t('complete')} ></button>
                     <button class="symbol" onclick={() => abort(idx)} title={t('abort')} ></button>
diff --git a/translations/src/main/resources/de.json b/translations/src/main/resources/de.json
index f36deba..f01789e 100644
--- a/translations/src/main/resources/de.json
+++ b/translations/src/main/resources/de.json
@@ -119,6 +119,7 @@
   "impersonate": "zu Nutzer wechseln",
   "IMPERSONATE": "Nutzer wechseln",
   "index_page": "Aufgabenübersicht",
+  "invert_filter": "Filter umkehren",
   "invoice": "Rechnung",
   "item": "Artikel",
   "items": "Artikel",
diff --git a/translations/src/main/resources/en.json b/translations/src/main/resources/en.json
index 34a8f4f..6eb2447 100644
--- a/translations/src/main/resources/en.json
+++ b/translations/src/main/resources/en.json
@@ -119,7 +119,9 @@
   "impersonate": "impersonate",
   "IMPERSONATE": "impersonate",
   "index_page": "task overview",
+  "invert_filter": "Filter umkehren",
   "invoice": "invoice",
+  "item": "Item",
   "items": "items",
 
   "join_objects" : "join {objects}",