diff --git a/example/example.cpp b/example/example.cpp
index e6508156..9647fddd 100644
--- a/example/example.cpp
+++ b/example/example.cpp
@@ -2,7 +2,6 @@
 // Copyright(c) 2015 Gabi Melman.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
 
-
 // spdlog usage example
 
 #include <cstdio>
diff --git a/include/spdlog/sinks/daily_file_sink.h b/include/spdlog/sinks/daily_file_sink.h
index a240294c..23ca6f0b 100644
--- a/include/spdlog/sinks/daily_file_sink.h
+++ b/include/spdlog/sinks/daily_file_sink.h
@@ -11,6 +11,7 @@
 #include "spdlog/details/null_mutex.h"
 #include "spdlog/fmt/fmt.h"
 #include "spdlog/sinks/base_sink.h"
+#include "spdlog/details/os.h"
 
 #include <chrono>
 #include <cstdio>
diff --git a/include/spdlog/sinks/stdout_sinks.h b/include/spdlog/sinks/stdout_sinks.h
index 91274c11..91bed987 100644
--- a/include/spdlog/sinks/stdout_sinks.h
+++ b/include/spdlog/sinks/stdout_sinks.h
@@ -9,6 +9,7 @@
 
 #include "spdlog/details/console_globals.h"
 #include "spdlog/details/null_mutex.h"
+#include "spdlog/details/pattern_formatter.h"
 
 #include <cstdio>
 #include <memory>
diff --git a/include/spdlog/sinks/wincolor_sink-inl.h b/include/spdlog/sinks/wincolor_sink-inl.h
index 8600e0ad..da5262b3 100644
--- a/include/spdlog/sinks/wincolor_sink-inl.h
+++ b/include/spdlog/sinks/wincolor_sink-inl.h
@@ -7,8 +7,8 @@ namespace spdlog {
 namespace sinks {
 template<typename TargetStream, typename ConsoleMutex>
 SPDLOG_INLINE wincolor_sink<TargetStream, ConsoleMutex>::wincolor_sink()
-		: out_handle_(TargetStream::handle())
-        , mutex_(ConsoleMutex::mutex())
+    : out_handle_(TargetStream::handle())
+    , mutex_(ConsoleMutex::mutex())
 {
     colors_[level::trace] = WHITE;
     colors_[level::debug] = CYAN;
@@ -49,7 +49,7 @@ void SPDLOG_INLINE wincolor_sink<TargetStream, ConsoleMutex>::log(const details:
         print_range_(formatted, msg.color_range_start, msg.color_range_end);
         ::SetConsoleTextAttribute(out_handle_,
             orig_attribs); // reset to orig colors
-                            // after color range
+                           // after color range
         print_range_(formatted, msg.color_range_end, formatted.size());
     }
     else // print without colors if color range is invalid
@@ -77,7 +77,7 @@ void SPDLOG_INLINE wincolor_sink<TargetStream, ConsoleMutex>::set_formatter(std:
     std::lock_guard<mutex_t> lock(mutex_);
     formatter_ = std::move(sink_formatter);
 }
-    
+
 // set color and return the orig console attributes (for resetting later)
 template<typename TargetStream, typename ConsoleMutex>
 WORD SPDLOG_INLINE wincolor_sink<TargetStream, ConsoleMutex>::set_console_attribs(WORD attribs)
@@ -100,5 +100,5 @@ void SPDLOG_INLINE wincolor_sink<TargetStream, ConsoleMutex>::print_range_(const
     ::WriteConsoleA(out_handle_, formatted.data() + start, size, nullptr, nullptr);
 }
 
-}
+} // namespace sinks
 } // namespace spdlog
\ No newline at end of file
diff --git a/include/spdlog/sinks/wincolor_sink.h b/include/spdlog/sinks/wincolor_sink.h
index 7645819c..29319fd9 100644
--- a/include/spdlog/sinks/wincolor_sink.h
+++ b/include/spdlog/sinks/wincolor_sink.h
@@ -35,27 +35,26 @@ public:
     const WORD WHITE = FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE;
     const WORD YELLOW = FOREGROUND_RED | FOREGROUND_GREEN;
 
-    wincolor_sink();    
+    wincolor_sink();
     ~wincolor_sink() override;
 
     wincolor_sink(const wincolor_sink &other) = delete;
     wincolor_sink &operator=(const wincolor_sink &other) = delete;
 
     // change the color for the given level
-    void set_color(level::level_enum level, WORD color);    
-    void log(const details::log_msg &msg) final override;    
-    void flush() final override;    
-    void set_pattern(const std::string &pattern) override final;    
+    void set_color(level::level_enum level, WORD color);
+    void log(const details::log_msg &msg) final override;
+    void flush() final override;
+    void set_pattern(const std::string &pattern) override final;
     void set_formatter(std::unique_ptr<spdlog::formatter> sink_formatter) override final;
-    
 
 private:
-    using mutex_t = typename ConsoleMutex::mutex_t;        
+    using mutex_t = typename ConsoleMutex::mutex_t;
     HANDLE out_handle_;
     mutex_t &mutex_;
     std::unordered_map<level::level_enum, WORD, level::level_hasher> colors_;
 
-	// set color and return the orig console attributes (for resetting later)
+    // set color and return the orig console attributes (for resetting later)
     WORD set_console_attribs(WORD attribs);
     // print a range of formatted message to console
     void print_range_(const fmt::memory_buffer &formatted, size_t start, size_t end);
diff --git a/include/spdlog/spdlog-inl.h b/include/spdlog/spdlog-inl.h
new file mode 100644
index 00000000..e2cd60ac
--- /dev/null
+++ b/include/spdlog/spdlog-inl.h
@@ -0,0 +1,96 @@
+// Copyright(c) 2015-present Gabi Melman & spdlog contributors.
+// Distributed under the MIT License (http://opensource.org/licenses/MIT)
+
+#pragma once
+
+#include "spdlog/common.h"
+#include "spdlog/details/pattern_formatter.h"
+
+namespace spdlog {
+
+SPDLOG_INLINE void initialize_logger(std::shared_ptr<logger> logger)
+{
+    details::registry::instance().initialize_logger(std::move(logger));
+}
+
+SPDLOG_INLINE std::shared_ptr<logger> get(const std::string &name)
+{
+    return details::registry::instance().get(name);
+}
+
+SPDLOG_INLINE void set_formatter(std::unique_ptr<spdlog::formatter> formatter)
+{
+    details::registry::instance().set_formatter(std::move(formatter));
+}
+
+SPDLOG_INLINE void set_pattern(std::string pattern, pattern_time_type time_type)
+{
+    set_formatter(std::unique_ptr<spdlog::formatter>(new pattern_formatter(std::move(pattern), time_type)));
+}
+
+SPDLOG_INLINE void set_level(level::level_enum log_level)
+{
+    details::registry::instance().set_level(log_level);
+}
+
+SPDLOG_INLINE void flush_on(level::level_enum log_level)
+{
+    details::registry::instance().flush_on(log_level);
+}
+
+SPDLOG_INLINE void flush_every(std::chrono::seconds interval)
+{
+    details::registry::instance().flush_every(interval);
+}
+
+SPDLOG_INLINE void set_error_handler(void (*handler)(const std::string &msg))
+{
+    details::registry::instance().set_error_handler(handler);
+}
+
+SPDLOG_INLINE void register_logger(std::shared_ptr<logger> logger)
+{
+    details::registry::instance().register_logger(std::move(logger));
+}
+
+SPDLOG_INLINE void apply_all(const std::function<void(std::shared_ptr<logger>)> &fun)
+{
+    details::registry::instance().apply_all(fun);
+}
+
+SPDLOG_INLINE void drop(const std::string &name)
+{
+    details::registry::instance().drop(name);
+}
+
+SPDLOG_INLINE void drop_all()
+{
+    details::registry::instance().drop_all();
+}
+
+SPDLOG_INLINE void shutdown()
+{
+    details::registry::instance().shutdown();
+}
+
+SPDLOG_INLINE void set_automatic_registration(bool automatic_registation)
+{
+    details::registry::instance().set_automatic_registration(automatic_registation);
+}
+
+SPDLOG_INLINE std::shared_ptr<spdlog::logger> default_logger()
+{
+    return details::registry::instance().default_logger();
+}
+
+SPDLOG_INLINE spdlog::logger *default_logger_raw()
+{
+    return details::registry::instance().get_default_raw();
+}
+
+SPDLOG_INLINE void set_default_logger(std::shared_ptr<spdlog::logger> default_logger)
+{
+    details::registry::instance().set_default_logger(std::move(default_logger));
+}
+
+} // namespace spdlog
\ No newline at end of file
diff --git a/include/spdlog/spdlog.h b/include/spdlog/spdlog.h
index db67dba6..56a69e4c 100644
--- a/include/spdlog/spdlog.h
+++ b/include/spdlog/spdlog.h
@@ -11,7 +11,6 @@
 
 #include "spdlog/common.h"
 #include "spdlog/details/registry.h"
-#include "spdlog/details/pattern_formatter.h"
 #include "spdlog/logger.h"
 #include "spdlog/version.h"
 
@@ -58,94 +57,52 @@ inline std::shared_ptr<spdlog::logger> create(std::string logger_name, SinkArgs
 //   auto console_sink = std::make_shared<spdlog::sinks::stdout_sink_mt>();
 //   auto console_logger = std::make_shared<spdlog::logger>("console_logger", console_sink);
 //   spdlog::initialize_logger(console_logger);
-inline void initialize_logger(std::shared_ptr<logger> logger)
-{
-    details::registry::instance().initialize_logger(std::move(logger));
-}
+void initialize_logger(std::shared_ptr<logger> logger);
 
 // Return an existing logger or nullptr if a logger with such name doesn't
 // exist.
 // example: spdlog::get("my_logger")->info("hello {}", "world");
-inline std::shared_ptr<logger> get(const std::string &name)
-{
-    return details::registry::instance().get(name);
-}
+std::shared_ptr<logger> get(const std::string &name);
 
 // Set global formatter. Each sink in each logger will get a clone of this object
-inline void set_formatter(std::unique_ptr<spdlog::formatter> formatter)
-{
-    details::registry::instance().set_formatter(std::move(formatter));
-}
+void set_formatter(std::unique_ptr<spdlog::formatter> formatter);
 
 // Set global format string.
 // example: spdlog::set_pattern("%Y-%m-%d %H:%M:%S.%e %l : %v");
-inline void set_pattern(std::string pattern, pattern_time_type time_type = pattern_time_type::local)
-{
-    set_formatter(std::unique_ptr<spdlog::formatter>(new pattern_formatter(std::move(pattern), time_type)));
-}
+void set_pattern(std::string pattern, pattern_time_type time_type = pattern_time_type::local);
 
 // Set global logging level
-inline void set_level(level::level_enum log_level)
-{
-    details::registry::instance().set_level(log_level);
-}
+void set_level(level::level_enum log_level);
 
 // Set global flush level
-inline void flush_on(level::level_enum log_level)
-{
-    details::registry::instance().flush_on(log_level);
-}
+void flush_on(level::level_enum log_level);
 
 // Start/Restart a periodic flusher thread
 // Warning: Use only if all your loggers are thread safe!
-inline void flush_every(std::chrono::seconds interval)
-{
-    details::registry::instance().flush_every(interval);
-}
+void flush_every(std::chrono::seconds interval);
 
 // Set global error handler
-inline void set_error_handler(void (*handler)(const std::string &msg))
-{
-    details::registry::instance().set_error_handler(handler);
-}
+void set_error_handler(void (*handler)(const std::string &msg));
 
 // Register the given logger with the given name
-inline void register_logger(std::shared_ptr<logger> logger)
-{
-    details::registry::instance().register_logger(std::move(logger));
-}
+void register_logger(std::shared_ptr<logger> logger);
 
 // Apply a user defined function on all registered loggers
 // Example:
 // spdlog::apply_all([&](std::shared_ptr<spdlog::logger> l) {l->flush();});
-inline void apply_all(const std::function<void(std::shared_ptr<logger>)> &fun)
-{
-    details::registry::instance().apply_all(fun);
-}
+void apply_all(const std::function<void(std::shared_ptr<logger>)> &fun);
 
 // Drop the reference to the given logger
-inline void drop(const std::string &name)
-{
-    details::registry::instance().drop(name);
-}
+void drop(const std::string &name);
 
 // Drop all references from the registry
-inline void drop_all()
-{
-    details::registry::instance().drop_all();
-}
+void drop_all();
 
 // stop any running threads started by spdlog and clean registry loggers
-inline void shutdown()
-{
-    details::registry::instance().shutdown();
-}
+void shutdown();
 
 // Automatic registration of loggers when using spdlog::create() or spdlog::create_async
-inline void set_automatic_registration(bool automatic_registation)
-{
-    details::registry::instance().set_automatic_registration(automatic_registation);
-}
+void set_automatic_registration(bool automatic_registation);
 
 // API for using default logger (stdout_color_mt),
 // e.g: spdlog::info("Message {}", 1);
@@ -162,20 +119,11 @@ inline void set_automatic_registration(bool automatic_registation)
 // set_default_logger() *should not* be used concurrently with the default API.
 // e.g do not call set_default_logger() from one thread while calling spdlog::info() from another.
 
-inline std::shared_ptr<spdlog::logger> default_logger()
-{
-    return details::registry::instance().default_logger();
-}
+std::shared_ptr<spdlog::logger> default_logger();
 
-inline spdlog::logger *default_logger_raw()
-{
-    return details::registry::instance().get_default_raw();
-}
+spdlog::logger *default_logger_raw();
 
-inline void set_default_logger(std::shared_ptr<spdlog::logger> default_logger)
-{
-    details::registry::instance().set_default_logger(std::move(default_logger));
-}
+void set_default_logger(std::shared_ptr<spdlog::logger> default_logger);
 
 template<typename... Args>
 inline void log(source_loc source, level::level_enum lvl, const char *fmt, const Args &... args)
@@ -382,4 +330,8 @@ inline void critical(const wchar_t *fmt, const Args &... args)
 #define SPDLOG_CRITICAL(...) (void)0
 #endif
 
+#ifdef SPDLOG_HEADER_ONLY
+#include "spdlog-inl.h"
+#endif
+
 #endif // SPDLOG_H
diff --git a/src/spdlog.cpp b/src/spdlog.cpp
index d4e78ffc..fd321535 100644
--- a/src/spdlog.cpp
+++ b/src/spdlog.cpp
@@ -9,6 +9,8 @@
 #include <chrono>
 
 #include "spdlog/spdlog.h"
+#include "spdlog/spdlog-inl.h"
+
 #include "spdlog/async.h"
 
 #include "spdlog/common.h"