diff --git a/src/common/file_system.cpp b/src/common/file_system.cpp
index 3a8bc73c0..b344a5882 100644
--- a/src/common/file_system.cpp
+++ b/src/common/file_system.cpp
@@ -915,13 +915,13 @@ static u32 RecursiveFindFiles(const char* origin_path, const char* parent_path,
   if (path)
   {
     if (parent_path)
-      tempStr = StringUtil::StdStringFromFormat("%s\\%s\\%s\\*", origin_path, parent_path, path);
+      tempStr = fmt::format("{}\\{}\\{}\\*", origin_path, parent_path, path);
     else
-      tempStr = StringUtil::StdStringFromFormat("%s\\%s\\*", origin_path, path);
+      tempStr = fmt::format("{}\\{}\\*", origin_path, path);
   }
   else
   {
-    tempStr = StringUtil::StdStringFromFormat("%s\\*", origin_path);
+    tempStr = fmt::format("{}\\*", origin_path);
   }
 
   // holder for utf-8 conversion
@@ -969,7 +969,7 @@ static u32 RecursiveFindFiles(const char* origin_path, const char* parent_path,
         // recurse into this directory
         if (parent_path != nullptr)
         {
-          const std::string recurseDir = StringUtil::StdStringFromFormat("%s\\%s", parent_path, path);
+          const std::string recurseDir = fmt::format("{}\\{}", parent_path, path);
           nFiles += RecursiveFindFiles(origin_path, recurseDir.c_str(), utf8_filename.c_str(), pattern, flags, results);
         }
         else
@@ -1009,19 +1009,18 @@ static u32 RecursiveFindFiles(const char* origin_path, const char* parent_path,
     if (!(flags & FILESYSTEM_FIND_RELATIVE_PATHS))
     {
       if (parent_path != nullptr)
-        outData.FileName =
-          StringUtil::StdStringFromFormat("%s\\%s\\%s\\%s", origin_path, parent_path, path, utf8_filename.c_str());
+        outData.FileName = fmt::format("{}\\{}\\{}\\{}", origin_path, parent_path, path, utf8_filename.c_str());
       else if (path != nullptr)
-        outData.FileName = StringUtil::StdStringFromFormat("%s\\%s\\%s", origin_path, path, utf8_filename.c_str());
+        outData.FileName = fmt::format("{}\\{}\\{}", origin_path, path, utf8_filename.c_str());
       else
-        outData.FileName = StringUtil::StdStringFromFormat("%s\\%s", origin_path, utf8_filename.c_str());
+        outData.FileName = fmt::format("{}\\{}", origin_path, utf8_filename.c_str());
     }
     else
     {
       if (parent_path != nullptr)
-        outData.FileName = StringUtil::StdStringFromFormat("%s\\%s\\%s", parent_path, path, utf8_filename.c_str());
+        outData.FileName = fmt::format("{}\\{}\\{}", parent_path, path, utf8_filename.c_str());
       else if (path != nullptr)
-        outData.FileName = StringUtil::StdStringFromFormat("%s\\%s", path, utf8_filename.c_str());
+        outData.FileName = fmt::format("{}\\{}", path, utf8_filename.c_str());
       else
         outData.FileName = utf8_filename;
     }
@@ -1447,13 +1446,13 @@ static u32 RecursiveFindFiles(const char* OriginPath, const char* ParentPath, co
   if (Path)
   {
     if (ParentPath)
-      tempStr = StringUtil::StdStringFromFormat("%s/%s/%s", OriginPath, ParentPath, Path);
+      tempStr = fmt::format("{}/{}/{}", OriginPath, ParentPath, Path);
     else
-      tempStr = StringUtil::StdStringFromFormat("%s/%s", OriginPath, Path);
+      tempStr = fmt::format("{}/{}", OriginPath, Path);
   }
   else
   {
-    tempStr = StringUtil::StdStringFromFormat("%s", OriginPath);
+    tempStr = OriginPath;
   }
 
   DIR* pDir = opendir(tempStr.c_str());
@@ -1485,11 +1484,11 @@ static u32 RecursiveFindFiles(const char* OriginPath, const char* ParentPath, co
 
     std::string full_path;
     if (ParentPath != nullptr)
-      full_path = StringUtil::StdStringFromFormat("%s/%s/%s/%s", OriginPath, ParentPath, Path, pDirEnt->d_name);
+      full_path = fmt::format("{}/{}/{}/{}", OriginPath, ParentPath, Path, pDirEnt->d_name);
     else if (Path != nullptr)
-      full_path = StringUtil::StdStringFromFormat("%s/%s/%s", OriginPath, Path, pDirEnt->d_name);
+      full_path = fmt::format("{}/{}/{}", OriginPath, Path, pDirEnt->d_name);
     else
-      full_path = StringUtil::StdStringFromFormat("%s/%s", OriginPath, pDirEnt->d_name);
+      full_path = fmt::format("{}/{}", OriginPath, pDirEnt->d_name);
 
     FILESYSTEM_FIND_DATA outData;
     outData.Attributes = 0;
@@ -1512,7 +1511,7 @@ static u32 RecursiveFindFiles(const char* OriginPath, const char* ParentPath, co
         // recurse into this directory
         if (ParentPath != nullptr)
         {
-          std::string recursiveDir = StringUtil::StdStringFromFormat("%s/%s", ParentPath, Path);
+          std::string recursiveDir = fmt::format("{}/{}", ParentPath, Path);
           nFiles += RecursiveFindFiles(OriginPath, recursiveDir.c_str(), pDirEnt->d_name, Pattern, Flags, pResults);
         }
         else
@@ -1557,9 +1556,9 @@ static u32 RecursiveFindFiles(const char* OriginPath, const char* ParentPath, co
     else
     {
       if (ParentPath != nullptr)
-        outData.FileName = StringUtil::StdStringFromFormat("%s/%s/%s", ParentPath, Path, pDirEnt->d_name);
+        outData.FileName = fmt::format("{}/{}/{}", ParentPath, Path, pDirEnt->d_name);
       else if (Path != nullptr)
-        outData.FileName = StringUtil::StdStringFromFormat("%s/%s", Path, pDirEnt->d_name);
+        outData.FileName = fmt::format("{}/{}", Path, pDirEnt->d_name);
       else
         outData.FileName = pDirEnt->d_name;
     }
diff --git a/src/core/achievements.cpp b/src/core/achievements.cpp
index 46877b79b..b7b95ccc6 100644
--- a/src/core/achievements.cpp
+++ b/src/core/achievements.cpp
@@ -269,7 +269,7 @@ std::string Achievements::GetGameHash(CDImage* image)
     std::memcpy(&header, executable_data.data(), sizeof(header));
   if (!BIOS::IsValidPSExeHeader(header, static_cast<u32>(executable_data.size())))
   {
-    Log_ErrorPrintf("PS-EXE header is invalid in '%s' (%zu bytes)", executable_name.c_str(), executable_data.size());
+    Log_ErrorFmt("PS-EXE header is invalid in '{}' ({} bytes)", executable_name, executable_data.size());
     return {};
   }
 
@@ -286,12 +286,11 @@ std::string Achievements::GetGameHash(CDImage* image)
   u8 hash[16];
   digest.Final(hash);
 
-  std::string hash_str(StringUtil::StdStringFromFormat(
-    "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", hash[0], hash[1], hash[2], hash[3], hash[4],
-    hash[5], hash[6], hash[7], hash[8], hash[9], hash[10], hash[11], hash[12], hash[13], hash[14], hash[15]));
+  const std::string hash_str = fmt::format(
+    "{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}", hash[0], hash[1], hash[2], hash[3], hash[4],
+    hash[5], hash[6], hash[7], hash[8], hash[9], hash[10], hash[11], hash[12], hash[13], hash[14], hash[15]);
 
-  Log_InfoPrintf("Hash for '%s' (%zu bytes, %u bytes hashed): %s", executable_name.c_str(), executable_data.size(),
-                 hash_size, hash_str.c_str());
+  Log_InfoFmt("Hash for '{}' ({} bytes, {} bytes hashed): {}", executable_name, executable_data.size(), hash_size, hash_str);
   return hash_str;
 }
 
@@ -304,7 +303,7 @@ void Achievements::DownloadImage(std::string url, std::string cache_filename)
 
     if (!FileSystem::WriteBinaryFile(cache_filename.c_str(), data.data(), data.size()))
     {
-      Log_ErrorPrintf("Failed to write badge image to '%s'", cache_filename.c_str());
+      Log_ErrorFmt("Failed to write badge image to '{}'", cache_filename);
       return;
     }
 
diff --git a/src/core/gdb_protocol.cpp b/src/core/gdb_protocol.cpp
index bb5a0b909..aca25ef2e 100644
--- a/src/core/gdb_protocol.cpp
+++ b/src/core/gdb_protocol.cpp
@@ -8,6 +8,7 @@
 #include "system.h"
 
 #include "common/log.h"
+#include "common/small_string.h"
 #include "common/string_util.h"
 
 #include <functional>
@@ -65,7 +66,7 @@ static std::optional<std::string_view> DeserializePacket(const std::string_view&
 static std::string SerializePacket(const std::string_view& in)
 {
   std::stringstream ss;
-  ss << '$' << in << '#' << StringUtil::StdStringFromFormat("%02x", ComputeChecksum(in));
+  ss << '$' << in << '#' << TinyString::from_fmt("{:02x}", ComputeChecksum(in));
   return ss.str();
 }
 
diff --git a/src/core/gpu_commands.cpp b/src/core/gpu_commands.cpp
index 767f1f4d9..1f46049e0 100644
--- a/src/core/gpu_commands.cpp
+++ b/src/core/gpu_commands.cpp
@@ -511,9 +511,8 @@ void GPU::FinishVRAMWrite()
   {
     if (g_settings.debugging.dump_cpu_to_vram_copies)
     {
-      DumpVRAMToFile(StringUtil::StdStringFromFormat("cpu_to_vram_copy_%u.png", s_cpu_to_vram_dump_id++).c_str(),
-                     m_vram_transfer.width, m_vram_transfer.height, sizeof(u16) * m_vram_transfer.width,
-                     m_blit_buffer.data(), true);
+      DumpVRAMToFile(TinyString::from_fmt("cpu_to_vram_copy_{}.png", s_cpu_to_vram_dump_id++), m_vram_transfer.width,
+                     m_vram_transfer.height, sizeof(u16) * m_vram_transfer.width, m_blit_buffer.data(), true);
     }
 
     if (g_settings.texture_replacements.ShouldDumpVRAMWrite(m_vram_transfer.width, m_vram_transfer.height))
@@ -580,8 +579,8 @@ bool GPU::HandleCopyRectangleVRAMToCPUCommand()
 
   if (g_settings.debugging.dump_vram_to_cpu_copies)
   {
-    DumpVRAMToFile(StringUtil::StdStringFromFormat("vram_to_cpu_copy_%u.png", s_vram_to_cpu_dump_id++).c_str(),
-                   m_vram_transfer.width, m_vram_transfer.height, sizeof(u16) * VRAM_WIDTH,
+    DumpVRAMToFile(TinyString::from_fmt("vram_to_cpu_copy_{}.png", s_vram_to_cpu_dump_id++), m_vram_transfer.width,
+                   m_vram_transfer.height, sizeof(u16) * VRAM_WIDTH,
                    &m_vram_ptr[m_vram_transfer.y * VRAM_WIDTH + m_vram_transfer.x], true);
   }
 
diff --git a/src/core/imgui_overlays.cpp b/src/core/imgui_overlays.cpp
index 59698829f..dd7744a87 100644
--- a/src/core/imgui_overlays.cpp
+++ b/src/core/imgui_overlays.cpp
@@ -773,8 +773,7 @@ void SaveStateSelectorUI::RefreshHotkeyLegend()
       setting = setting.substr(slash_pos + 1);
     }
 
-    return StringUtil::StdStringFromFormat("%.*s - %.*s", static_cast<int>(setting.size()), setting.data(),
-                                           static_cast<int>(caption.size()), caption.data());
+    return fmt::format("{} - {}", setting, caption);
   };
 
   s_load_legend = format_legend_entry(Host::GetStringSettingValue("Hotkeys", "LoadSelectedSaveState"),
diff --git a/src/core/system.cpp b/src/core/system.cpp
index 09f2b3c71..916322f58 100644
--- a/src/core/system.cpp
+++ b/src/core/system.cpp
@@ -542,7 +542,7 @@ ConsoleRegion System::GetConsoleRegionForDiscRegion(DiscRegion region)
 
 std::string System::GetGameHashId(GameHash hash)
 {
-  return StringUtil::StdStringFromFormat("HASH-%" PRIX64, hash);
+  return fmt::format("HASH-{:X}", hash);
 }
 
 bool System::GetGameDetailsFromImage(CDImage* cdi, std::string* out_id, GameHash* out_hash)
@@ -4255,10 +4255,9 @@ std::optional<ExtendedSaveStateInfo> System::InternalGetExtendedSaveStateInfo(By
   ExtendedSaveStateInfo ssi;
   if (header.version < SAVE_STATE_MINIMUM_VERSION || header.version > SAVE_STATE_VERSION)
   {
-    ssi.title = StringUtil::StdStringFromFormat(
-      TRANSLATE("CommonHostInterface", "Invalid version %u (%s version %u)"), header.version,
-      header.version > SAVE_STATE_VERSION ? "maximum" : "minimum",
-      header.version > SAVE_STATE_VERSION ? SAVE_STATE_VERSION : SAVE_STATE_MINIMUM_VERSION);
+    ssi.title = fmt::format(TRANSLATE_FS("System", "Invalid version {} ({} version {})"), header.version,
+                            header.version > SAVE_STATE_VERSION ? "maximum" : "minimum",
+                            header.version > SAVE_STATE_VERSION ? SAVE_STATE_VERSION : SAVE_STATE_MINIMUM_VERSION);
     return ssi;
   }
 
diff --git a/src/duckstation-qt/cheatmanagerdialog.cpp b/src/duckstation-qt/cheatmanagerdialog.cpp
index 584c01447..61c2abc56 100644
--- a/src/duckstation-qt/cheatmanagerdialog.cpp
+++ b/src/duckstation-qt/cheatmanagerdialog.cpp
@@ -748,7 +748,7 @@ void CheatManagerDialog::addToWatchClicked()
   for (int index = indexFirst; index <= indexLast; index++)
   {
     const MemoryScan::Result& res = m_scanner.GetResults()[static_cast<u32>(index)];
-    m_watch.AddEntry(StringUtil::StdStringFromFormat("0x%08x", res.address), res.address, m_scanner.GetSize(),
+    m_watch.AddEntry(fmt::format("0x{:08x}", res.address), res.address, m_scanner.GetSize(),
                      m_scanner.GetValueSigned(), false);
     updateWatch();
   }
@@ -775,7 +775,7 @@ void CheatManagerDialog::addManualWatchAddressClicked()
   else if (index == 2 || index == 5)
     address.value() &= 0xFFFFFFFC;
 
-  m_watch.AddEntry(StringUtil::StdStringFromFormat("0x%08x", address.value()), address.value(),
+  m_watch.AddEntry(fmt::format("0x{:08x}", address.value()), address.value(),
                    static_cast<MemoryAccessSize>(index % 3), (index > 3), false);
   updateWatch();
 }
diff --git a/src/duckstation-qt/memorycardsettingswidget.cpp b/src/duckstation-qt/memorycardsettingswidget.cpp
index bddd675e3..af4057ec7 100644
--- a/src/duckstation-qt/memorycardsettingswidget.cpp
+++ b/src/duckstation-qt/memorycardsettingswidget.cpp
@@ -127,7 +127,7 @@ void MemoryCardSettingsWidget::createPortSettingsUi(SettingsDialog* dialog, int
 
   const MemoryCardType default_value = (index == 0) ? MemoryCardType::PerGameTitle : MemoryCardType::None;
   SettingWidgetBinder::BindWidgetToEnumSetting(m_dialog->getSettingsInterface(), ui->memory_card_type, "MemoryCards",
-                                               StringUtil::StdStringFromFormat("Card%dType", index + 1),
+                                               fmt::format("Card{}Type", index + 1),
                                                &Settings::ParseMemoryCardTypeName, &Settings::GetMemoryCardTypeName,
                                                default_value);
   ui->layout->addWidget(new QLabel(tr("Memory Card Type:"), ui->container));
diff --git a/src/util/cd_image_hasher.cpp b/src/util/cd_image_hasher.cpp
index f18164aea..73ac491e4 100644
--- a/src/util/cd_image_hasher.cpp
+++ b/src/util/cd_image_hasher.cpp
@@ -80,20 +80,21 @@ static bool ReadTrack(CDImage* image, u8 track, MD5Digest* digest, ProgressCallb
 
 std::string HashToString(const Hash& hash)
 {
-  return StringUtil::StdStringFromFormat("%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", hash[0],
-                                         hash[1], hash[2], hash[3], hash[4], hash[5], hash[6], hash[7], hash[8],
-                                         hash[9], hash[10], hash[11], hash[12], hash[13], hash[14], hash[15]);
+  return fmt::format("{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}{:02x}",
+                     hash[0], hash[1], hash[2], hash[3], hash[4], hash[5], hash[6], hash[7], hash[8], hash[9], hash[10],
+                     hash[11], hash[12], hash[13], hash[14], hash[15]);
 }
 
-std::optional<Hash> HashFromString(const std::string_view& str) {
-    auto decoded = StringUtil::DecodeHex(str);
-    if (decoded && decoded->size() == std::tuple_size_v<Hash>)
-    {
-        Hash result;
-        std::copy(decoded->begin(), decoded->end(), result.begin());
-        return result;
-    }
-    return std::nullopt;
+std::optional<Hash> HashFromString(const std::string_view& str)
+{
+  auto decoded = StringUtil::DecodeHex(str);
+  if (decoded && decoded->size() == std::tuple_size_v<Hash>)
+  {
+    Hash result;
+    std::copy(decoded->begin(), decoded->end(), result.begin());
+    return result;
+  }
+  return std::nullopt;
 }
 
 bool GetImageHash(CDImage* image, Hash* out_hash,
diff --git a/src/util/cd_image_pbp.cpp b/src/util/cd_image_pbp.cpp
index 4dcfe5e49..11d287a99 100644
--- a/src/util/cd_image_pbp.cpp
+++ b/src/util/cd_image_pbp.cpp
@@ -876,7 +876,7 @@ std::string CDImagePBP::GetSubImageMetadata(u32 index, const std::string_view& t
   {
     const std::string* title = LookupStringSFOTableEntry("TITLE", m_sfo_table);
     if (title && !title->empty())
-      return StringUtil::StdStringFromFormat("%s (Disc %u)", title->c_str(), index + 1);
+      return fmt::format("{} (Disc {})", *title, index + 1);
   }
 
   return CDImage::GetSubImageMetadata(index, type);
diff --git a/src/util/cubeb_audio_stream.cpp b/src/util/cubeb_audio_stream.cpp
index 6a3de873f..f5fc8a933 100644
--- a/src/util/cubeb_audio_stream.cpp
+++ b/src/util/cubeb_audio_stream.cpp
@@ -36,11 +36,12 @@ CubebAudioStream::~CubebAudioStream()
 
 void CubebAudioStream::LogCallback(const char* fmt, ...)
 {
+  LargeString str;
   std::va_list ap;
   va_start(ap, fmt);
-  std::string msg(StringUtil::StdStringFromFormatV(fmt, ap));
+  str.format_va(fmt, ap);
   va_end(ap);
-  Log_DevPrintf("(Cubeb): %s", msg.c_str());
+  Log_DevPrint(str);
 }
 
 void CubebAudioStream::DestroyContextAndStream()
diff --git a/src/util/d3d11_device.cpp b/src/util/d3d11_device.cpp
index c096b1643..1d0e6e089 100644
--- a/src/util/d3d11_device.cpp
+++ b/src/util/d3d11_device.cpp
@@ -423,7 +423,7 @@ std::string D3D11Device::GetDriverInfo() const
       DXGI_ADAPTER_DESC desc;
       if (SUCCEEDED(dxgi_adapter->GetDesc(&desc)))
       {
-        ret += StringUtil::StdStringFromFormat("VID: 0x%04X PID: 0x%04X\n", desc.VendorId, desc.DeviceId);
+        fmt::format_to(std::back_inserter(ret), "VID: 0x{:04X} PID: 0x{:04X}\n", desc.VendorId, desc.DeviceId);
         ret += StringUtil::WideStringToUTF8String(desc.Description);
         ret += "\n";
 
diff --git a/src/util/d3d12_device.cpp b/src/util/d3d12_device.cpp
index b940161f5..e165687b8 100644
--- a/src/util/d3d12_device.cpp
+++ b/src/util/d3d12_device.cpp
@@ -1039,7 +1039,7 @@ std::string D3D12Device::GetDriverInfo() const
   DXGI_ADAPTER_DESC desc;
   if (m_adapter && SUCCEEDED(m_adapter->GetDesc(&desc)))
   {
-    ret += StringUtil::StdStringFromFormat("VID: 0x%04X PID: 0x%04X\n", desc.VendorId, desc.DeviceId);
+    fmt::format_to(std::back_inserter(ret), "VID: 0x{:04X} PID: 0x{:04X}\n", desc.VendorId, desc.DeviceId);
     ret += StringUtil::WideStringToUTF8String(desc.Description);
     ret += "\n";
 
diff --git a/src/util/gpu_device.cpp b/src/util/gpu_device.cpp
index 38e64451a..d14abb1e3 100644
--- a/src/util/gpu_device.cpp
+++ b/src/util/gpu_device.cpp
@@ -635,7 +635,7 @@ bool GPUDevice::GetRequestedExclusiveFullscreenMode(u32* width, u32* height, flo
 
 std::string GPUDevice::GetFullscreenModeString(u32 width, u32 height, float refresh_rate)
 {
-  return StringUtil::StdStringFromFormat("%u x %u @ %f hz", width, height, refresh_rate);
+  return fmt::format("{} x {} @ {} hz", width, height, refresh_rate);
 }
 
 std::string GPUDevice::GetShaderDumpPath(const std::string_view& name)
diff --git a/src/util/imgui_fullscreen.cpp b/src/util/imgui_fullscreen.cpp
index f0e57fcac..e63610295 100644
--- a/src/util/imgui_fullscreen.cpp
+++ b/src/util/imgui_fullscreen.cpp
@@ -1691,10 +1691,7 @@ void ImGuiFullscreen::PopulateFileSelectorItems()
   if (s_file_selector_current_directory.empty())
   {
     for (std::string& root_path : FileSystem::GetRootDirectoryList())
-    {
-      s_file_selector_items.emplace_back(StringUtil::StdStringFromFormat(ICON_FA_FOLDER " %s", root_path.c_str()),
-                                         std::move(root_path), false);
-    }
+      s_file_selector_items.emplace_back(fmt::format(ICON_FA_FOLDER " {}", root_path), std::move(root_path), false);
   }
   else
   {
@@ -1722,12 +1719,12 @@ void ImGuiFullscreen::PopulateFileSelectorItems()
 
     for (const FILESYSTEM_FIND_DATA& fd : results)
     {
-      std::string full_path(StringUtil::StdStringFromFormat(
-        "%s" FS_OSPATH_SEPARATOR_STR "%s", s_file_selector_current_directory.c_str(), fd.FileName.c_str()));
+      std::string full_path =
+        fmt::format("{}" FS_OSPATH_SEPARATOR_STR "{}", s_file_selector_current_directory, fd.FileName);
 
       if (fd.Attributes & FILESYSTEM_FILE_ATTRIBUTE_DIRECTORY)
       {
-        std::string title(StringUtil::StdStringFromFormat(ICON_FA_FOLDER " %s", fd.FileName.c_str()));
+        std::string title = fmt::format(ICON_FA_FOLDER " {}", fd.FileName);
         s_file_selector_items.emplace_back(std::move(title), std::move(full_path), false);
       }
       else
@@ -1741,7 +1738,7 @@ void ImGuiFullscreen::PopulateFileSelectorItems()
           continue;
         }
 
-        std::string title(StringUtil::StdStringFromFormat(ICON_FA_FILE " %s", fd.FileName.c_str()));
+        std::string title = fmt::format(ICON_FA_FILE " {}", fd.FileName);
         s_file_selector_items.emplace_back(std::move(title), std::move(full_path), true);
       }
     }
@@ -1770,7 +1767,7 @@ void ImGuiFullscreen::OpenFileSelector(const char* title, bool select_directory,
 
   s_file_selector_open = true;
   s_file_selector_directory = select_directory;
-  s_file_selector_title = StringUtil::StdStringFromFormat("%s##file_selector", title);
+  s_file_selector_title = fmt::format("{}##file_selector", title);
   s_file_selector_callback = std::move(callback);
   s_file_selector_filters = std::move(filters);
 
@@ -1894,7 +1891,7 @@ void ImGuiFullscreen::OpenChoiceDialog(const char* title, bool checkable, Choice
 
   s_choice_dialog_open = true;
   s_choice_dialog_checkable = checkable;
-  s_choice_dialog_title = StringUtil::StdStringFromFormat("%s##choice_dialog", title);
+  s_choice_dialog_title = fmt::format("{}##choice_dialog", title);
   s_choice_dialog_options = std::move(options);
   s_choice_dialog_callback = std::move(callback);
 }
diff --git a/src/util/input_source.cpp b/src/util/input_source.cpp
index c89b7a91e..6165b35d3 100644
--- a/src/util/input_source.cpp
+++ b/src/util/input_source.cpp
@@ -141,13 +141,13 @@ std::string InputSource::ConvertGenericControllerKeyToString(InputBindingKey key
         modifier = "Full";
         break;
     }
-    return StringUtil::StdStringFromFormat("%s-%u/%sAxis%u", InputManager::InputSourceToString(key.source_type),
-                                           key.source_index, modifier, key.data);
+    return fmt::format("{}-{}/{}Axis{}", InputManager::InputSourceToString(key.source_type),
+                       static_cast<u32>(key.source_index), modifier, key.data);
   }
   else if (key.source_subtype == InputSubclass::ControllerButton)
   {
-    return StringUtil::StdStringFromFormat("%s%u/Button%u", InputManager::InputSourceToString(key.source_type),
-                                           key.source_index, key.data);
+    return fmt::format("{}{}/Button{}", InputManager::InputSourceToString(key.source_type),
+                       static_cast<u32>(key.source_index), key.data);
   }
   else
   {
diff --git a/src/util/sdl_input_source.cpp b/src/util/sdl_input_source.cpp
index 6ce5c170f..ecafd5de5 100644
--- a/src/util/sdl_input_source.cpp
+++ b/src/util/sdl_input_source.cpp
@@ -261,7 +261,7 @@ std::vector<std::pair<std::string, std::string>> SDLInputSource::EnumerateDevice
 
   for (const ControllerData& cd : m_controllers)
   {
-    std::string id(StringUtil::StdStringFromFormat("SDL-%d", cd.player_id));
+    std::string id = fmt::format("SDL-{}", cd.player_id);
 
     const char* name = cd.game_controller ? SDL_GameControllerName(cd.game_controller) : SDL_JoystickName(cd.joystick);
     if (name)
@@ -407,41 +407,40 @@ std::string SDLInputSource::ConvertKeyToString(InputBindingKey key)
         (key.modifier == InputModifier::FullAxis ? "Full" : (key.modifier == InputModifier::Negate ? "-" : "+"));
       if (key.data < std::size(s_sdl_axis_names))
       {
-        ret = StringUtil::StdStringFromFormat("SDL-%u/%s%s", key.source_index, modifier, s_sdl_axis_names[key.data]);
+        ret = fmt::format("SDL-{}/{}{}", static_cast<u32>(key.source_index), modifier, s_sdl_axis_names[key.data]);
       }
       else
       {
-        ret = StringUtil::StdStringFromFormat("SDL-%u/%sAxis%u%s", key.source_index, modifier,
-                                              key.data - static_cast<u32>(std::size(s_sdl_axis_names)),
-                                              key.invert ? "~" : "");
+        ret = fmt::format("SDL-{}/{}Axis{}{}", static_cast<u32>(key.source_index), modifier,
+                          key.data - static_cast<u32>(std::size(s_sdl_axis_names)), key.invert ? "~" : "");
       }
     }
     else if (key.source_subtype == InputSubclass::ControllerButton)
     {
       if (key.data < std::size(s_sdl_button_names))
       {
-        ret = StringUtil::StdStringFromFormat("SDL-%u/%s", key.source_index, s_sdl_button_names[key.data]);
+        ret = fmt::format("SDL-{}/{}", static_cast<u32>(key.source_index), s_sdl_button_names[key.data]);
       }
       else
       {
-        ret = StringUtil::StdStringFromFormat("SDL-%u/Button%u", key.source_index,
-                                              key.data - static_cast<u32>(std::size(s_sdl_button_names)));
+        ret = fmt::format("SDL-{}/Button{}", static_cast<u32>(key.source_index),
+                          key.data - static_cast<u32>(std::size(s_sdl_button_names)));
       }
     }
     else if (key.source_subtype == InputSubclass::ControllerHat)
     {
       const u32 hat_index = key.data / static_cast<u32>(std::size(s_sdl_hat_direction_names));
       const u32 hat_direction = key.data % static_cast<u32>(std::size(s_sdl_hat_direction_names));
-      ret = StringUtil::StdStringFromFormat("SDL-%u/Hat%u%s", key.source_index, hat_index,
-                                            s_sdl_hat_direction_names[hat_direction]);
+      ret = fmt::format("SDL-{}/Hat{}{}", static_cast<u32>(key.source_index), hat_index,
+                        s_sdl_hat_direction_names[hat_direction]);
     }
     else if (key.source_subtype == InputSubclass::ControllerMotor)
     {
-      ret = StringUtil::StdStringFromFormat("SDL-%u/%sMotor", key.source_index, key.data ? "Large" : "Small");
+      ret = fmt::format("SDL-{}/{}Motor", static_cast<u32>(key.source_index), key.data ? "Large" : "Small");
     }
     else if (key.source_subtype == InputSubclass::ControllerHaptic)
     {
-      ret = StringUtil::StdStringFromFormat("SDL-%u/Haptic", key.source_index);
+      ret = fmt::format("SDL-{}/Haptic", static_cast<u32>(key.source_index));
     }
   }
 
@@ -681,7 +680,7 @@ bool SDLInputSource::OpenDevice(int index, bool is_gamecontroller)
 
   m_controllers.push_back(std::move(cd));
 
-  InputManager::OnInputDeviceConnected(StringUtil::StdStringFromFormat("SDL-%d", player_id), name);
+  InputManager::OnInputDeviceConnected(fmt::format("SDL-{}", player_id), name);
   return true;
 }
 
@@ -691,7 +690,7 @@ bool SDLInputSource::CloseDevice(int joystick_index)
   if (it == m_controllers.end())
     return false;
 
-  InputManager::OnInputDeviceDisconnected(StringUtil::StdStringFromFormat("SDL-%d", it->player_id));
+  InputManager::OnInputDeviceDisconnected(fmt::format("SDL-{}", it->player_id));
 
   if (it->haptic)
     SDL_HapticClose(it->haptic);
@@ -842,27 +841,27 @@ bool SDLInputSource::GetGenericBindingMapping(const std::string_view& device, Ge
       const GenericInputBinding negative = s_sdl_generic_binding_axis_mapping[i][0];
       const GenericInputBinding positive = s_sdl_generic_binding_axis_mapping[i][1];
       if (negative != GenericInputBinding::Unknown)
-        mapping->emplace_back(negative, StringUtil::StdStringFromFormat("SDL-%d/-%s", pid, s_sdl_axis_names[i]));
+        mapping->emplace_back(negative, fmt::format("SDL-{}/-{}", pid, s_sdl_axis_names[i]));
 
       if (positive != GenericInputBinding::Unknown)
-        mapping->emplace_back(positive, StringUtil::StdStringFromFormat("SDL-%d/+%s", pid, s_sdl_axis_names[i]));
+        mapping->emplace_back(positive, fmt::format("SDL-{}/+{}", pid, s_sdl_axis_names[i]));
     }
     for (u32 i = 0; i < std::size(s_sdl_generic_binding_button_mapping); i++)
     {
       const GenericInputBinding binding = s_sdl_generic_binding_button_mapping[i];
       if (binding != GenericInputBinding::Unknown)
-        mapping->emplace_back(binding, StringUtil::StdStringFromFormat("SDL-%d/%s", pid, s_sdl_button_names[i]));
+        mapping->emplace_back(binding, fmt::format("SDL-{}/{}", pid, s_sdl_button_names[i]));
     }
 
     if (it->use_game_controller_rumble || it->haptic_left_right_effect)
     {
-      mapping->emplace_back(GenericInputBinding::SmallMotor, StringUtil::StdStringFromFormat("SDL-%d/SmallMotor", pid));
-      mapping->emplace_back(GenericInputBinding::LargeMotor, StringUtil::StdStringFromFormat("SDL-%d/LargeMotor", pid));
+      mapping->emplace_back(GenericInputBinding::SmallMotor, fmt::format("SDL-{}/SmallMotor", pid));
+      mapping->emplace_back(GenericInputBinding::LargeMotor, fmt::format("SDL-{}/LargeMotor", pid));
     }
     else
     {
-      mapping->emplace_back(GenericInputBinding::SmallMotor, StringUtil::StdStringFromFormat("SDL-%d/Haptic", pid));
-      mapping->emplace_back(GenericInputBinding::LargeMotor, StringUtil::StdStringFromFormat("SDL-%d/Haptic", pid));
+      mapping->emplace_back(GenericInputBinding::SmallMotor, fmt::format("SDL-{}/Haptic", pid));
+      mapping->emplace_back(GenericInputBinding::LargeMotor, fmt::format("SDL-{}/Haptic", pid));
     }
 
     return true;
diff --git a/src/util/vulkan_device.cpp b/src/util/vulkan_device.cpp
index 4caad3edf..bc5a74a1c 100644
--- a/src/util/vulkan_device.cpp
+++ b/src/util/vulkan_device.cpp
@@ -1982,8 +1982,8 @@ std::string VulkanDevice::GetDriverInfo() const
   if (m_optional_extensions.vk_khr_driver_properties)
   {
     const VkPhysicalDeviceDriverProperties& props = m_device_driver_properties;
-    ret = StringUtil::StdStringFromFormat(
-      "Driver %u.%u.%u\nVulkan %u.%u.%u\nConformance Version %u.%u.%u.%u\n%s\n%s\n%s", VK_VERSION_MAJOR(driver_version),
+    ret = fmt::format(
+      "Driver {}.{}.{}\nVulkan {}.{}.{}\nConformance Version {}.{}.{}.{}\n{}\n{}\n{}", VK_VERSION_MAJOR(driver_version),
       VK_VERSION_MINOR(driver_version), VK_VERSION_PATCH(driver_version), VK_API_VERSION_MAJOR(api_version),
       VK_API_VERSION_MINOR(api_version), VK_API_VERSION_PATCH(api_version), props.conformanceVersion.major,
       props.conformanceVersion.minor, props.conformanceVersion.subminor, props.conformanceVersion.patch,
@@ -1991,10 +1991,10 @@ std::string VulkanDevice::GetDriverInfo() const
   }
   else
   {
-    ret = StringUtil::StdStringFromFormat("Driver %u.%u.%u\nVulkan %u.%u.%u\n%s", VK_VERSION_MAJOR(driver_version),
-                                          VK_VERSION_MINOR(driver_version), VK_VERSION_PATCH(driver_version),
-                                          VK_API_VERSION_MAJOR(api_version), VK_API_VERSION_MINOR(api_version),
-                                          VK_API_VERSION_PATCH(api_version), m_device_properties.deviceName);
+    ret =
+      fmt::format("Driver {}.{}.{}\nVulkan {}.{}.{}\n{}", VK_VERSION_MAJOR(driver_version),
+                  VK_VERSION_MINOR(driver_version), VK_VERSION_PATCH(driver_version), VK_API_VERSION_MAJOR(api_version),
+                  VK_API_VERSION_MINOR(api_version), VK_API_VERSION_PATCH(api_version), m_device_properties.deviceName);
   }
 
   return ret;
diff --git a/src/util/xinput_source.cpp b/src/util/xinput_source.cpp
index ed2312c2a..36f351674 100644
--- a/src/util/xinput_source.cpp
+++ b/src/util/xinput_source.cpp
@@ -215,8 +215,7 @@ std::vector<std::pair<std::string, std::string>> XInputSource::EnumerateDevices(
     if (!m_controllers[i].connected)
       continue;
 
-    ret.emplace_back(StringUtil::StdStringFromFormat("XInput-%u", i),
-                     StringUtil::StdStringFromFormat("XInput Controller %u", i));
+    ret.emplace_back(fmt::format("XInput-{}", i), fmt::format("XInput Controller {}", i));
   }
 
   return ret;
@@ -297,15 +296,15 @@ std::string XInputSource::ConvertKeyToString(InputBindingKey key)
     if (key.source_subtype == InputSubclass::ControllerAxis && key.data < std::size(s_axis_names))
     {
       const char modifier = key.modifier == InputModifier::Negate ? '-' : '+';
-      ret = StringUtil::StdStringFromFormat("XInput-%u/%c%s", key.source_index, modifier, s_axis_names[key.data]);
+      ret = fmt::format("XInput-{}/{}{}", static_cast<u32>(key.source_index), modifier, s_axis_names[key.data]);
     }
     else if (key.source_subtype == InputSubclass::ControllerButton && key.data < std::size(s_button_names))
     {
-      ret = StringUtil::StdStringFromFormat("XInput-%u/%s", key.source_index, s_button_names[key.data]);
+      ret = fmt::format("XInput-{}/{}", static_cast<u32>(key.source_index), s_button_names[key.data]);
     }
     else if (key.source_subtype == InputSubclass::ControllerMotor)
     {
-      ret = StringUtil::StdStringFromFormat("XInput-%u/%sMotor", key.source_index, key.data ? "Large" : "Small");
+      ret = fmt::format("XInput-{}/{}Motor", static_cast<u32>(key.source_index), key.data ? "Large" : "Small");
     }
   }
 
@@ -351,24 +350,22 @@ bool XInputSource::GetGenericBindingMapping(const std::string_view& device, Gene
     const GenericInputBinding negative = s_xinput_generic_binding_axis_mapping[i][0];
     const GenericInputBinding positive = s_xinput_generic_binding_axis_mapping[i][1];
     if (negative != GenericInputBinding::Unknown)
-      mapping->emplace_back(negative, StringUtil::StdStringFromFormat("XInput-%d/-%s", pid, s_axis_names[i]));
+      mapping->emplace_back(negative, fmt::format("XInput-{}/-{}", pid, s_axis_names[i]));
 
     if (positive != GenericInputBinding::Unknown)
-      mapping->emplace_back(positive, StringUtil::StdStringFromFormat("XInput-%d/+%s", pid, s_axis_names[i]));
+      mapping->emplace_back(positive, fmt::format("XInput-{}/+{}", pid, s_axis_names[i]));
   }
   for (u32 i = 0; i < std::size(s_xinput_generic_binding_button_mapping); i++)
   {
     const GenericInputBinding binding = s_xinput_generic_binding_button_mapping[i];
     if (binding != GenericInputBinding::Unknown)
-      mapping->emplace_back(binding, StringUtil::StdStringFromFormat("XInput-%d/%s", pid, s_button_names[i]));
+      mapping->emplace_back(binding, fmt::format("XInput-{}/{}", pid, s_button_names[i]));
   }
 
   if (m_controllers[pid].has_small_motor)
-    mapping->emplace_back(GenericInputBinding::SmallMotor,
-                          StringUtil::StdStringFromFormat("XInput-%d/SmallMotor", pid));
+    mapping->emplace_back(GenericInputBinding::SmallMotor, fmt::format("XInput-{}/SmallMotor", pid));
   if (m_controllers[pid].has_large_motor)
-    mapping->emplace_back(GenericInputBinding::LargeMotor,
-                          StringUtil::StdStringFromFormat("XInput-%d/LargeMotor", pid));
+    mapping->emplace_back(GenericInputBinding::LargeMotor, fmt::format("XInput-{}/LargeMotor", pid));
 
   return true;
 }
@@ -387,14 +384,14 @@ void XInputSource::HandleControllerConnection(u32 index)
   cd.has_small_motor = caps.Vibration.wRightMotorSpeed != 0;
   cd.last_state = {};
 
-  InputManager::OnInputDeviceConnected(StringUtil::StdStringFromFormat("XInput-%u", index),
-                                       StringUtil::StdStringFromFormat("XInput Controller %u", index));
+  InputManager::OnInputDeviceConnected(fmt::format("XInput-{}", index),
+    fmt::format("XInput Controller {}", index));
 }
 
 void XInputSource::HandleControllerDisconnection(u32 index)
 {
   Log_InfoPrintf("XInput controller %u disconnected.", index);
-  InputManager::OnInputDeviceDisconnected(StringUtil::StdStringFromFormat("XInput-%u", index));
+  InputManager::OnInputDeviceDisconnected(fmt::format("XInput-{}", index));
   m_controllers[index] = {};
 }