diff --git a/Kernel/Devices/Device.cpp b/Kernel/Devices/Device.cpp
index c768eb7308..77b951e89c 100644
--- a/Kernel/Devices/Device.cpp
+++ b/Kernel/Devices/Device.cpp
@@ -72,7 +72,7 @@ Device::~Device()
 
 String Device::absolute_path() const
 {
-    return String::format("device:%u,%u (%s)", m_major, m_minor, class_name());
+    return String::formatted("device:{},{} ({})", m_major, m_minor, class_name());
 }
 
 String Device::absolute_path(const FileDescription&) const
diff --git a/Kernel/Devices/PS2MouseDevice.cpp b/Kernel/Devices/PS2MouseDevice.cpp
index 159cb9b35b..ee53c540a6 100644
--- a/Kernel/Devices/PS2MouseDevice.cpp
+++ b/Kernel/Devices/PS2MouseDevice.cpp
@@ -181,8 +181,8 @@ MousePacket PS2MouseDevice::parse_data_packet(const RawPacket& raw_packet)
 
     packet.is_relative = true;
 #ifdef PS2MOUSE_DEBUG
-    dbg() << "PS2 Relative Mouse: Buttons " << String::format("%x", packet.buttons);
-    dbg() << "Mouse: X " << packet.x << ", Y " << packet.y << ", Z " << packet.z;
+    dbgln("PS2 Relative Mouse: Buttons {:x}", packet.buttons);
+    dbgln("Mouse: X {}, Y {}, Z {}", packet.x, packet.y, packet.z);
 #endif
     return packet;
 }
@@ -282,8 +282,8 @@ KResultOr<size_t> PS2MouseDevice::read(FileDescription&, size_t, UserOrKernelBuf
         lock.unlock();
 
 #ifdef PS2MOUSE_DEBUG
-        dbg() << "PS2 Mouse Read: Buttons " << String::format("%x", packet.buttons);
-        dbg() << "PS2 Mouse: X " << packet.x << ", Y " << packet.y << ", Z " << packet.z << " Relative " << packet.buttons;
+        dbgln("PS2 Mouse Read: Buttons {:x}", packet.buttons);
+        dbgln("PS2 Mouse: X {}, Y {}, Z {}, Relative {}", packet.x, packet.y, packet.z, packet.buttons);
         dbgln("PS2 Mouse Read: Filter packets");
 #endif
         size_t bytes_read_from_packet = min(remaining_space_in_buffer, sizeof(MousePacket));
diff --git a/Kernel/FileSystem/DevFS.cpp b/Kernel/FileSystem/DevFS.cpp
index 84e7176b4b..123f5e45c8 100644
--- a/Kernel/FileSystem/DevFS.cpp
+++ b/Kernel/FileSystem/DevFS.cpp
@@ -394,8 +394,8 @@ String DevFSDeviceInode::determine_name() const
 
         case 4:
             if (m_attached_device->minor() >= 64)
-                return String::format("ttyS%d", m_attached_device->minor() - 64);
-            return String::format("tty%d", m_attached_device->minor());
+                return String::formatted("ttyS{}", m_attached_device->minor() - 64);
+            return String::formatted("tty{}", m_attached_device->minor());
 
         default:
             ASSERT_NOT_REACHED();
@@ -403,7 +403,7 @@ String DevFSDeviceInode::determine_name() const
     } else {
         switch (m_attached_device->major()) {
         case 29:
-            return String::format("fb%d", m_attached_device->minor());
+            return String::formatted("fb{}", m_attached_device->minor());
         case 3: {
             size_t drive_index = (u8)'a' + m_attached_device->minor();
             char drive_letter = (u8)drive_index;
@@ -414,7 +414,7 @@ String DevFSDeviceInode::determine_name() const
             // FIXME: Try to not hardcode a maximum of 16 partitions per drive!
             size_t drive_index = (u8)'a' + (m_attached_device->minor() / 16);
             char drive_letter = (u8)drive_index;
-            return String::format("hd%c%d", drive_letter, m_attached_device->minor() + 1);
+            return String::formatted("hd{:c}{}", drive_letter, m_attached_device->minor() + 1);
         }
     }
 
diff --git a/Kernel/FileSystem/InodeIdentifier.h b/Kernel/FileSystem/InodeIdentifier.h
index 0522e70bc1..d7a44316a1 100644
--- a/Kernel/FileSystem/InodeIdentifier.h
+++ b/Kernel/FileSystem/InodeIdentifier.h
@@ -62,7 +62,7 @@ public:
         return m_fsid != other.m_fsid || m_index != other.m_index;
     }
 
-    String to_string() const { return String::format("%u:%u", m_fsid, m_index); }
+    String to_string() const { return String::formatted("{}:{}", m_fsid, m_index); }
 
 private:
     u32 m_fsid { 0 };
diff --git a/Kernel/FileSystem/InodeWatcher.cpp b/Kernel/FileSystem/InodeWatcher.cpp
index df03df8845..09580bbaff 100644
--- a/Kernel/FileSystem/InodeWatcher.cpp
+++ b/Kernel/FileSystem/InodeWatcher.cpp
@@ -90,7 +90,7 @@ KResultOr<size_t> InodeWatcher::write(FileDescription&, size_t, const UserOrKern
 String InodeWatcher::absolute_path(const FileDescription&) const
 {
     if (auto inode = m_inode.strong_ref())
-        return String::format("InodeWatcher:%s", inode->identifier().to_string().characters());
+        return String::formatted("InodeWatcher:{}", inode->identifier().to_string());
     return "InodeWatcher:(gone)";
 }
 
diff --git a/Kernel/FileSystem/ProcFS.cpp b/Kernel/FileSystem/ProcFS.cpp
index ed085ed0ef..c5aa834fb8 100644
--- a/Kernel/FileSystem/ProcFS.cpp
+++ b/Kernel/FileSystem/ProcFS.cpp
@@ -130,9 +130,6 @@ enum ProcFileType {
 
 static inline ProcessID to_pid(const InodeIdentifier& identifier)
 {
-#ifdef PROCFS_DEBUG
-    dbg() << "to_pid, index=" << String::format("%08x", identifier.index()) << " -> " << (identifier.index() >> 16);
-#endif
     return identifier.index() >> 16u;
 }
 
@@ -800,9 +797,9 @@ static bool procfs$memstat(InodeIdentifier, KBufferBuilder& builder)
     json.add("kmalloc_call_count", stats.kmalloc_call_count);
     json.add("kfree_call_count", stats.kfree_call_count);
     slab_alloc_stats([&json](size_t slab_size, size_t num_allocated, size_t num_free) {
-        auto prefix = String::format("slab_%zu", slab_size);
-        json.add(String::format("%s_num_allocated", prefix.characters()), num_allocated);
-        json.add(String::format("%s_num_free", prefix.characters()), num_free);
+        auto prefix = String::formatted("slab_{}", slab_size);
+        json.add(String::formatted("{}_num_allocated", prefix), num_allocated);
+        json.add(String::formatted("{}_num_free", prefix), num_free);
     });
     json.finish();
     return true;
@@ -1264,10 +1261,6 @@ InodeMetadata ProcFSInode::metadata() const
             metadata.mode &= ~077;
         }
     }
-
-#ifdef PROCFS_DEBUG
-    dbg() << "Returning mode " << String::format("%o", metadata.mode);
-#endif
     return metadata;
 }
 
diff --git a/Kernel/IO.h b/Kernel/IO.h
index f6d971371b..41a8df2f33 100644
--- a/Kernel/IO.h
+++ b/Kernel/IO.h
@@ -174,7 +174,7 @@ private:
 
 inline const LogStream& operator<<(const LogStream& stream, IOAddress value)
 {
-    return stream << "IO " << String::format("%x", value.get());
+    return stream << "IO " << String::formatted("{:x}", value.get());
 }
 
 template<>
diff --git a/Kernel/TTY/MasterPTY.cpp b/Kernel/TTY/MasterPTY.cpp
index 9ac4ba2290..eca9f4c2fa 100644
--- a/Kernel/TTY/MasterPTY.cpp
+++ b/Kernel/TTY/MasterPTY.cpp
@@ -41,7 +41,7 @@ MasterPTY::MasterPTY(unsigned index)
     , m_slave(adopt(*new SlavePTY(*this, index)))
     , m_index(index)
 {
-    m_pts_name = String::format("/dev/pts/%u", m_index);
+    m_pts_name = String::formatted("/dev/pts/{}", m_index);
     auto process = Process::current();
     set_uid(process->uid());
     set_gid(process->gid());
@@ -143,7 +143,7 @@ int MasterPTY::ioctl(FileDescription& description, unsigned request, FlatPtr arg
 
 String MasterPTY::absolute_path(const FileDescription&) const
 {
-    return String::format("ptm:%s", m_pts_name.characters());
+    return String::formatted("ptm:{}", m_pts_name);
 }
 
 }
diff --git a/Kernel/TTY/VirtualConsole.cpp b/Kernel/TTY/VirtualConsole.cpp
index 961ee9f8c2..4f87c49fd5 100644
--- a/Kernel/TTY/VirtualConsole.cpp
+++ b/Kernel/TTY/VirtualConsole.cpp
@@ -70,7 +70,7 @@ VirtualConsole::VirtualConsole(const unsigned index)
 {
     ASSERT(index < s_max_virtual_consoles);
 
-    m_tty_name = String::format("/dev/tty%u", m_index);
+    m_tty_name = String::formatted("/dev/tty{}", m_index);
     m_terminal.set_size(80, 25);
 
     s_consoles[index] = this;
diff --git a/Kernel/Thread.cpp b/Kernel/Thread.cpp
index bf5922db44..17849bd191 100644
--- a/Kernel/Thread.cpp
+++ b/Kernel/Thread.cpp
@@ -91,7 +91,7 @@ Thread::Thread(NonnullRefPtr<Process> process)
 
     m_tss.cr3 = m_process->page_directory().cr3();
 
-    m_kernel_stack_region = MM.allocate_kernel_region(default_kernel_stack_size, String::format("Kernel Stack (Thread %d)", m_tid.value()), Region::Access::Read | Region::Access::Write, false, AllocationStrategy::AllocateNow);
+    m_kernel_stack_region = MM.allocate_kernel_region(default_kernel_stack_size, String::formatted("Kernel Stack (Thread {})", m_tid.value()), Region::Access::Read | Region::Access::Write, false, AllocationStrategy::AllocateNow);
     if (!m_kernel_stack_region) {
         // Abort creating this thread, was_created() will return false
         return;
diff --git a/Kernel/Time/PIT.cpp b/Kernel/Time/PIT.cpp
index 3234a5cf53..df3af8167b 100644
--- a/Kernel/Time/PIT.cpp
+++ b/Kernel/Time/PIT.cpp
@@ -53,7 +53,7 @@ PIT::PIT(Function<void(const RegisterState&)> callback)
 {
     IO::out8(PIT_CTL, TIMER0_SELECT | WRITE_WORD | MODE_SQUARE_WAVE);
 
-    klog() << "PIT: " << OPTIMAL_TICKS_PER_SECOND_RATE << " Hz, square wave (" << String::format("%x", BASE_FREQUENCY / OPTIMAL_TICKS_PER_SECOND_RATE) << ")";
+    klog() << "PIT: " << OPTIMAL_TICKS_PER_SECOND_RATE << " Hz, square wave (" << String::formatted("{:x}", BASE_FREQUENCY / OPTIMAL_TICKS_PER_SECOND_RATE) << ")";
     reset_to_default_ticks_per_second();
     enable_irq();
 }
diff --git a/Kernel/VM/PhysicalPage.cpp b/Kernel/VM/PhysicalPage.cpp
index 0a7818c7b5..50cbda1669 100644
--- a/Kernel/VM/PhysicalPage.cpp
+++ b/Kernel/VM/PhysicalPage.cpp
@@ -52,7 +52,7 @@ void PhysicalPage::return_to_freelist() const
         MM.deallocate_user_physical_page(*this);
 
 #ifdef MM_DEBUG
-    dbg() << "MM: P" << String::format("%x", m_paddr.get()) << " released to freelist";
+    dbgln("MM: {} released to freelist", m_paddr);
 #endif
 }
 
diff --git a/Kernel/VM/RangeAllocator.h b/Kernel/VM/RangeAllocator.h
index 964139c475..89292ef3e6 100644
--- a/Kernel/VM/RangeAllocator.h
+++ b/Kernel/VM/RangeAllocator.h
@@ -107,7 +107,7 @@ private:
 
 inline const LogStream& operator<<(const LogStream& stream, const Range& value)
 {
-    return stream << String::format("Range(%x-%x)", value.base().get(), value.end().get() - 1);
+    return stream << String::formatted("Range({:08x}-{:08x})", value.base().get(), value.end().get() - 1);
 }
 
 }
diff --git a/Kernel/VM/Region.cpp b/Kernel/VM/Region.cpp
index 119e02c8f4..215b3c05d4 100644
--- a/Kernel/VM/Region.cpp
+++ b/Kernel/VM/Region.cpp
@@ -382,10 +382,6 @@ void Region::unmap(ShouldDeallocateVirtualMemoryRange deallocate_range)
     for (size_t i = 0; i < count; ++i) {
         auto vaddr = vaddr_from_page_index(i);
         MM.release_pte(*m_page_directory, vaddr, i == count - 1);
-#ifdef MM_DEBUG
-        auto* page = physical_page(i);
-        dbg() << "MM: >> Unmapped " << vaddr << " => P" << String::format("%p", (void*)(page ? page->paddr().get() : 0)) << " <<";
-#endif
     }
     MM.flush_tlb(m_page_directory, vaddr(), page_count());
     if (deallocate_range == ShouldDeallocateVirtualMemoryRange::Yes) {