diff --git a/lib/base/CMakeLists.txt b/lib/base/CMakeLists.txt
index 7e5c4fcce..503e28a73 100644
--- a/lib/base/CMakeLists.txt
+++ b/lib/base/CMakeLists.txt
@@ -57,6 +57,8 @@ target_include_directories(trbase
         ${CMAKE_SOURCE_DIR})
 
 target_link_libraries(trbase
+    PRIVATE
+        FastFloat::fast_float
     PUBLIC
         transmission::fmt-header-only
         utf8::cpp
diff --git a/lib/base/string-utils.cc b/lib/base/string-utils.cc
index be976169c..97a3b1705 100644
--- a/lib/base/string-utils.cc
+++ b/lib/base/string-utils.cc
@@ -4,12 +4,16 @@
 // License text can be found in the licenses/ folder.
 
 #include <cctype>
+#include <charconv> // std::from_chars()
 #include <cstdint>
 #include <cstring>
 #include <iterator>
+#include <optional>
 #include <ranges>
 #include <string>
 #include <string_view>
+#include <system_error>
+#include <type_traits>
 
 #ifdef _WIN32
 #include <windows.h>
@@ -17,6 +21,8 @@
 
 #include <fmt/format.h>
 
+#include <fast_float/fast_float.h>
+
 #include <utf8.h>
 
 #include <wildmat.h>
@@ -153,3 +159,58 @@ std::u8string tr_strv_to_u8string(std::string_view const sv)
     auto const view = std::views::transform(u8str, [](char c) -> char8_t { return c; });
     return { view.begin(), view.end() };
 }
+
+// --- tr_num_parse()
+
+template<typename T>
+[[nodiscard]] std::optional<T> tr_num_parse(std::string_view str, std::string_view* remainder, int base)
+    requires std::is_integral_v<T>
+{
+    auto val = T{};
+    auto const* const begin_ch = std::data(str);
+    auto const* const end_ch = begin_ch + std::size(str);
+    auto const result = std::from_chars(begin_ch, end_ch, val, base);
+    if (result.ec != std::errc{})
+    {
+        return std::nullopt;
+    }
+    if (remainder != nullptr)
+    {
+        *remainder = str;
+        remainder->remove_prefix(result.ptr - std::data(str));
+    }
+    return val;
+}
+
+template std::optional<long long> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
+template std::optional<long> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
+template std::optional<int> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
+template std::optional<char> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
+
+template std::optional<unsigned long long> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
+template std::optional<unsigned long> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
+template std::optional<unsigned int> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
+template std::optional<unsigned short> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
+template std::optional<unsigned char> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
+
+template<typename T>
+[[nodiscard]] std::optional<T> tr_num_parse(std::string_view str, std::string_view* remainder)
+    requires std::is_floating_point_v<T>
+{
+    auto const* const begin_ch = std::data(str);
+    auto const* const end_ch = begin_ch + std::size(str);
+    auto val = T{};
+    auto const result = fast_float::from_chars(begin_ch, end_ch, val);
+    if (result.ec != std::errc{})
+    {
+        return std::nullopt;
+    }
+    if (remainder != nullptr)
+    {
+        *remainder = str;
+        remainder->remove_prefix(result.ptr - std::data(str));
+    }
+    return val;
+}
+
+template std::optional<double> tr_num_parse(std::string_view sv, std::string_view* remainder);
diff --git a/lib/base/string-utils.h b/lib/base/string-utils.h
index 4724fd0d6..08e80e0c5 100644
--- a/lib/base/string-utils.h
+++ b/lib/base/string-utils.h
@@ -9,8 +9,10 @@
 #include <cctype>
 #include <cstdint>
 #include <iterator>
+#include <optional>
 #include <string>
 #include <string_view>
+#include <type_traits>
 #include <utility>
 
 #ifdef _WIN32
@@ -100,6 +102,14 @@ template <typename... Args> constexpr bool tr_strv_sep(std::string_view* sv, std
     return true;
 }
 
+template <typename T>
+[[nodiscard]] std::optional<T> tr_num_parse(std::string_view str, std::string_view* setme_remainder = nullptr, int base = 10)
+    requires std::is_integral_v<T>;
+
+template <typename T>
+[[nodiscard]] std::optional<T> tr_num_parse(std::string_view str, std::string_view* setme_remainder = nullptr)
+    requires std::is_floating_point_v<T>;
+
 [[nodiscard]] std::string_view tr_strv_strip(std::string_view str);
 
 [[nodiscard]] std::string tr_strv_to_utf8_string(std::string_view sv);
diff --git a/libtransmission/CMakeLists.txt b/libtransmission/CMakeLists.txt
index ae90caf75..212aac257 100644
--- a/libtransmission/CMakeLists.txt
+++ b/libtransmission/CMakeLists.txt
@@ -227,7 +227,6 @@ target_link_libraries(${TR_NAME}
         Threads::Threads
         libdeflate::libdeflate
         CURL::libcurl
-        FastFloat::fast_float
         psl::psl
         natpmp::natpmp
         miniupnpc::miniupnpc
diff --git a/libtransmission/clients.cc b/libtransmission/clients.cc
index ea5a1ed0e..b5d2c24c6 100644
--- a/libtransmission/clients.cc
+++ b/libtransmission/clients.cc
@@ -18,9 +18,10 @@
 
 #include <fmt/format.h>
 
+#include "lib/base/string-utils.h"
+
 #include "libtransmission/clients.h"
 #include "libtransmission/types.h"
-#include "libtransmission/utils.h"
 
 using namespace std::literals;
 
diff --git a/libtransmission/utils.cc b/libtransmission/utils.cc
index b1ae8d5b4..e8b1852cc 100644
--- a/libtransmission/utils.cc
+++ b/libtransmission/utils.cc
@@ -6,7 +6,6 @@
 #include <algorithm> // for std::sort, std::transform
 #include <array> // std::array
 #include <cfloat> // DBL_DIG
-#include <charconv> // std::from_chars()
 #include <chrono>
 #include <cstdint> // SIZE_MAX
 #include <cstdlib> // getenv()
@@ -38,8 +37,6 @@
 
 #include <fmt/format.h>
 
-#include <fast_float/fast_float.h>
-
 #include "lib/base/env.h"
 #include "lib/base/string-utils.h"
 #include "lib/base/tr-assert.h"
@@ -469,58 +466,3 @@ std::string_view tr_get_mime_type_for_filename(std::string_view filename)
     auto constexpr Fallback = "application/octet-stream"sv;
     return Fallback;
 }
-
-// --- tr_num_parse()
-
-template<typename T>
-[[nodiscard]] std::optional<T> tr_num_parse(std::string_view str, std::string_view* remainder, int base)
-    requires std::is_integral_v<T>
-{
-    auto val = T{};
-    auto const* const begin_ch = std::data(str);
-    auto const* const end_ch = begin_ch + std::size(str);
-    auto const result = std::from_chars(begin_ch, end_ch, val, base);
-    if (result.ec != std::errc{})
-    {
-        return std::nullopt;
-    }
-    if (remainder != nullptr)
-    {
-        *remainder = str;
-        remainder->remove_prefix(result.ptr - std::data(str));
-    }
-    return val;
-}
-
-template std::optional<long long> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
-template std::optional<long> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
-template std::optional<int> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
-template std::optional<char> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
-
-template std::optional<unsigned long long> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
-template std::optional<unsigned long> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
-template std::optional<unsigned int> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
-template std::optional<unsigned short> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
-template std::optional<unsigned char> tr_num_parse(std::string_view str, std::string_view* remainder, int base);
-
-template<typename T>
-[[nodiscard]] std::optional<T> tr_num_parse(std::string_view str, std::string_view* remainder)
-    requires std::is_floating_point_v<T>
-{
-    auto const* const begin_ch = std::data(str);
-    auto const* const end_ch = begin_ch + std::size(str);
-    auto val = T{};
-    auto const result = fast_float::from_chars(begin_ch, end_ch, val);
-    if (result.ec != std::errc{})
-    {
-        return std::nullopt;
-    }
-    if (remainder != nullptr)
-    {
-        *remainder = str;
-        remainder->remove_prefix(result.ptr - std::data(str));
-    }
-    return val;
-}
-
-template std::optional<double> tr_num_parse(std::string_view sv, std::string_view* remainder);
diff --git a/libtransmission/utils.h b/libtransmission/utils.h
index ca6d6c123..4f0a1da54 100644
--- a/libtransmission/utils.h
+++ b/libtransmission/utils.h
@@ -68,14 +68,6 @@ template<typename T>
 
 // ---
 
-template<typename T>
-[[nodiscard]] std::optional<T> tr_num_parse(std::string_view str, std::string_view* setme_remainder = nullptr, int base = 10)
-    requires std::is_integral_v<T>;
-
-template<typename T>
-[[nodiscard]] std::optional<T> tr_num_parse(std::string_view str, std::string_view* setme_remainder = nullptr)
-    requires std::is_floating_point_v<T>;
-
 /**
  * @brief Given a string like "1-4" or "1-4,6,9,14-51", this returns a
  *        newly-allocated array of all the integers in the set.
diff --git a/libtransmission/variant-benc.cc b/libtransmission/variant-benc.cc
index 6071ce874..41f7af74c 100644
--- a/libtransmission/variant-benc.cc
+++ b/libtransmission/variant-benc.cc
@@ -25,7 +25,6 @@
 
 #include "libtransmission/benc.h"
 #include "libtransmission/quark.h"
-#include "libtransmission/utils.h"
 #include "libtransmission/variant.h"
 
 using namespace std::literals;
diff --git a/libtransmission/variant-json.cc b/libtransmission/variant-json.cc
index 3dfa91465..4254c41c4 100644
--- a/libtransmission/variant-json.cc
+++ b/libtransmission/variant-json.cc
@@ -35,7 +35,6 @@
 #include "lib/base/i18n.h"
 
 #include "libtransmission/quark.h"
-#include "libtransmission/utils.h"
 #include "libtransmission/variant.h"
 
 namespace
diff --git a/libtransmission/variant.cc b/libtransmission/variant.cc
index bda9f61c9..d9b3020bc 100644
--- a/libtransmission/variant.cc
+++ b/libtransmission/variant.cc
@@ -23,11 +23,11 @@
 #include "lib/base/error.h"
 #include "lib/base/file-utils.h"
 #include "lib/base/i18n.h"
+#include "lib/base/string-utils.h"
 #include "lib/base/tr-assert.h"
 
 #include "libtransmission/log.h"
 #include "libtransmission/quark.h"
-#include "libtransmission/utils.h"
 #include "libtransmission/variant.h"
 
 using namespace std::literals;