diff --git a/Userland/Applications/PDFViewer/CMakeLists.txt b/Userland/Applications/PDFViewer/CMakeLists.txt
index 57f89c52599..387699194e2 100644
--- a/Userland/Applications/PDFViewer/CMakeLists.txt
+++ b/Userland/Applications/PDFViewer/CMakeLists.txt
@@ -13,4 +13,4 @@ set(SOURCES
     )
 
 serenity_app(PDFViewer ICON app-pdf-viewer)
-target_link_libraries(PDFViewer LibGUI LibPDF)
+target_link_libraries(PDFViewer LibGUI LibPDF LibFileSystemAccessClient)
diff --git a/Userland/Applications/PDFViewer/PDFViewerWidget.cpp b/Userland/Applications/PDFViewer/PDFViewerWidget.cpp
index 2a1a8259852..9b818680ca7 100644
--- a/Userland/Applications/PDFViewer/PDFViewerWidget.cpp
+++ b/Userland/Applications/PDFViewer/PDFViewerWidget.cpp
@@ -1,11 +1,13 @@
 /*
  * Copyright (c) 2021, Matthew Olsson <mattco@serenityos.org>
+ * Copyright (c) 2021, Mustafa Quraish <mustafa@cs.toronto.edu>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #include "PDFViewerWidget.h"
 #include <LibCore/File.h>
+#include <LibFileSystemAccessClient/Client.h>
 #include <LibGUI/Application.h>
 #include <LibGUI/BoxLayout.h>
 #include <LibGUI/FilePicker.h>
@@ -39,9 +41,15 @@ void PDFViewerWidget::initialize_menubar(GUI::Window& window)
 {
     auto& file_menu = window.add_menu("&File");
     file_menu.add_action(GUI::CommonActions::make_open_action([&](auto&) {
-        Optional<String> open_path = GUI::FilePicker::get_open_filepath(&window);
-        if (open_path.has_value())
-            open_file(open_path.value());
+        auto response = FileSystemAccessClient::Client::the().open_file(window.window_id());
+
+        if (response.error != 0) {
+            if (response.error != -1)
+                GUI::MessageBox::show_error(&window, String::formatted("Opening \"{}\" failed: {}", *response.chosen_file, strerror(response.error)));
+            return;
+        }
+
+        open_file(*response.fd, *response.chosen_file);
     }));
     file_menu.add_separator();
     file_menu.add_action(GUI::CommonActions::make_quit_action([](auto&) {
@@ -103,16 +111,16 @@ void PDFViewerWidget::create_toolbar()
     m_total_page_label = toolbar.add<GUI::Label>();
 }
 
-void PDFViewerWidget::open_file(const String& path)
+void PDFViewerWidget::open_file(int fd, String const& path)
 {
-    window()->set_title(String::formatted("{} - PDF Viewer", path));
-    auto file_result = Core::File::open(path, Core::OpenMode::ReadOnly);
-    if (file_result.is_error()) {
-        GUI::MessageBox::show_error(nullptr, String::formatted("Couldn't open file: {}", path));
+    auto file = Core::File::construct();
+    if (!file->open(fd, Core::OpenMode::ReadOnly, Core::File::ShouldCloseFileDescriptor::Yes) && file->error() != ENOENT) {
+        GUI::MessageBox::show(window(), String::formatted("Opening \"{}\" failed: {}", path, strerror(errno)), "Error", GUI::MessageBox::Type::Error);
         return;
     }
+    window()->set_title(String::formatted("{} - PDF Viewer", path));
 
-    m_buffer = file_result.value()->read_all();
+    m_buffer = file->read_all();
     auto document = PDF::Document::create(m_buffer);
     if (!document) {
         GUI::MessageBox::show_error(nullptr, String::formatted("Couldn't load PDF: {}", path));
diff --git a/Userland/Applications/PDFViewer/PDFViewerWidget.h b/Userland/Applications/PDFViewer/PDFViewerWidget.h
index 86c7dbfc540..6fff9905364 100644
--- a/Userland/Applications/PDFViewer/PDFViewerWidget.h
+++ b/Userland/Applications/PDFViewer/PDFViewerWidget.h
@@ -23,7 +23,7 @@ public:
 
     void initialize_menubar(GUI::Window&);
     void create_toolbar();
-    void open_file(const String& path);
+    void open_file(int fd, const String& path);
 
 private:
     PDFViewerWidget();
diff --git a/Userland/Applications/PDFViewer/main.cpp b/Userland/Applications/PDFViewer/main.cpp
index 61dada80f18..fc1d042a798 100644
--- a/Userland/Applications/PDFViewer/main.cpp
+++ b/Userland/Applications/PDFViewer/main.cpp
@@ -1,13 +1,16 @@
 /*
  * Copyright (c) 2021, Matthew Olsson <mattco@serenityos.org>
+ * Copyright (c) 2021, Mustafa Quraish <mustafa@cs.toronto.edu>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #include "PDFViewerWidget.h"
+#include <LibFileSystemAccessClient/Client.h>
 #include <LibGUI/Application.h>
 #include <LibGUI/Icon.h>
 #include <LibGUI/Menubar.h>
+#include <LibGUI/MessageBox.h>
 #include <LibGUI/Window.h>
 
 int main(int argc, char** argv)
@@ -19,6 +22,21 @@ int main(int argc, char** argv)
     window->set_title("PDF Viewer");
     window->resize(640, 400);
 
+    if (unveil("/res", "r") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    if (unveil("/tmp/portal/filesystemaccess", "rw") < 0) {
+        perror("unveil");
+        return 1;
+    }
+
+    if (unveil(nullptr, nullptr) < 0) {
+        perror("unveil");
+        return 1;
+    }
+
     auto& pdf_viewer_widget = window->set_main_widget<PDFViewerWidget>();
 
     pdf_viewer_widget.initialize_menubar(*window);
@@ -26,8 +44,16 @@ int main(int argc, char** argv)
     window->show();
     window->set_icon(app_icon.bitmap_for_size(16));
 
-    if (argc >= 2)
-        pdf_viewer_widget.open_file(argv[1]);
+    if (argc >= 2) {
+        auto response = FileSystemAccessClient::Client::the().request_file(window->window_id(), argv[1], Core::OpenMode::ReadOnly);
+
+        if (response.error != 0) {
+            if (response.error != -1)
+                GUI::MessageBox::show_error(window, String::formatted("Opening \"{}\" failed: {}", *response.chosen_file, strerror(response.error)));
+            return 1;
+        }
+        pdf_viewer_widget.open_file(*response.fd, *response.chosen_file);
+    }
 
     return app->exec();
 }