diff --git a/CMakeLists.txt b/CMakeLists.txt
index 943c637b..0295c325 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -108,6 +108,7 @@ set(RESOURCE_HEADERS
     src/resource/format/lytreader.h
     src/resource/format/pereader.h
     src/resource/format/rimreader.h
+    src/resource/format/rimwriter.h
     src/resource/format/ssfreader.h
     src/resource/format/tlkreader.h
     src/resource/format/visreader.h
@@ -135,6 +136,7 @@ set(RESOURCE_SOURCES
     src/resource/format/lytreader.cpp
     src/resource/format/pereader.cpp
     src/resource/format/rimreader.cpp
+    src/resource/format/rimwriter.cpp
     src/resource/format/ssfreader.cpp
     src/resource/format/tlkreader.cpp
     src/resource/format/visreader.cpp
diff --git a/src/common/streamwriter.cpp b/src/common/streamwriter.cpp
index e1958e52..0c40626a 100644
--- a/src/common/streamwriter.cpp
+++ b/src/common/streamwriter.cpp
@@ -68,6 +68,11 @@ void StreamWriter::putBytes(const ByteArray &bytes) {
     _stream->write(&bytes[0], bytes.size());
 }
 
+void StreamWriter::putBytes(int count, uint8_t val) {
+    ByteArray data(count, val);
+    _stream->write(&data[0], count);
+}
+
 size_t StreamWriter::tell() const {
     return _stream->tellp();
 }
diff --git a/src/common/streamwriter.h b/src/common/streamwriter.h
index 5196cd1f..31d9e521 100644
--- a/src/common/streamwriter.h
+++ b/src/common/streamwriter.h
@@ -42,6 +42,7 @@ public:
     void putString(const std::string &str);
     void putCString(const std::string &str);
     void putBytes(const ByteArray &bytes);
+    void putBytes(int count, uint8_t val = 0);
 
     size_t tell() const;
 
diff --git a/src/resource/format/rimwriter.cpp b/src/resource/format/rimwriter.cpp
new file mode 100644
index 00000000..954eef09
--- /dev/null
+++ b/src/resource/format/rimwriter.cpp
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2020-2021 The reone project contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "rimwriter.h"
+
+#include <memory>
+
+#include <boost/filesystem.hpp>
+
+#include "../../common/streamwriter.h"
+
+using namespace std;
+
+namespace fs = boost::filesystem;
+
+namespace reone {
+
+namespace resource {
+
+void RimWriter::add(Resource &&res) {
+    _resources.push_back(res);
+}
+
+void RimWriter::save(const fs::path &path) {
+    auto rim = make_shared<fs::ofstream>(path, ios::binary);
+    StreamWriter writer(rim);
+    uint32_t numResources = static_cast<uint32_t>(_resources.size());
+
+    writer.putString("RIM V1.0");
+    writer.putUint32(0); // reserved
+    writer.putUint32(numResources);
+    writer.putUint32(0x78); // offset to resource headers
+    writer.putBytes(100); // reserved
+
+    uint32_t id = 0;
+    uint32_t offset = 0x78 + numResources * 32;
+
+    // Write resource headers
+    for (auto &res : _resources) {
+        auto size = static_cast<uint32_t>(res.data.size());
+
+        string resRef(res.resRef);
+        resRef.resize(16);
+        writer.putString(resRef);
+
+        writer.putUint32(static_cast<uint32_t>(res.resType));
+        writer.putUint32(id++);
+        writer.putUint32(offset);
+        writer.putUint32(size);
+
+        offset += size;
+    }
+
+    // Write resources data
+    for (auto &res : _resources) {
+        writer.putBytes(res.data);
+    }
+}
+
+} // namespace resource
+
+} // namespace reone
diff --git a/src/resource/format/rimwriter.h b/src/resource/format/rimwriter.h
new file mode 100644
index 00000000..f115cebc
--- /dev/null
+++ b/src/resource/format/rimwriter.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2020-2021 The reone project contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include <boost/filesystem/path.hpp>
+
+#include "../../common/types.h"
+
+#include "../types.h"
+
+namespace reone {
+
+namespace resource {
+
+class RimWriter {
+public:
+    struct Resource {
+        std::string resRef;
+        ResourceType resType { ResourceType::Invalid };
+        ByteArray data;
+    };
+
+    void add(Resource &&res);
+    void save(const boost::filesystem::path &path);
+
+private:
+    std::vector<Resource> _resources;
+};
+
+} // namespace resource
+
+} // namespace reone
diff --git a/src/resource/typeutil.cpp b/src/resource/typeutil.cpp
index 7322ebf9..d56c6183 100644
--- a/src/resource/typeutil.cpp
+++ b/src/resource/typeutil.cpp
@@ -97,7 +97,7 @@ const string &getExtByResType(ResourceType type) {
     return g_extByType[type];
 }
 
-ResourceType getResTypeByExt(const string &ext) {
+ResourceType getResTypeByExt(const string &ext, bool logNotFound) {
     if (!g_typeByExtInited) {
         for (auto &entry : g_extByType) {
             g_typeByExt.insert(make_pair(entry.second, entry.first));
@@ -106,7 +106,9 @@ ResourceType getResTypeByExt(const string &ext) {
     }
     auto it = g_typeByExt.find(ext);
     if (it == g_typeByExt.end()) {
-        warn("Resource type not found by extension: " + ext);
+        if (logNotFound) {
+            warn("Resource type not found by extension: " + ext);
+        }
         return ResourceType::Invalid;
     }
 
diff --git a/src/resource/typeutil.h b/src/resource/typeutil.h
index 9491c3ea..3f796672 100644
--- a/src/resource/typeutil.h
+++ b/src/resource/typeutil.h
@@ -26,7 +26,7 @@ namespace reone {
 namespace resource {
 
 const std::string &getExtByResType(ResourceType type);
-ResourceType getResTypeByExt(const std::string &ext);
+ResourceType getResTypeByExt(const std::string &ext, bool logNotFound = true);
 
 } // namespace resource
 
diff --git a/tools/program.cpp b/tools/program.cpp
index af53e21b..c7f86282 100644
--- a/tools/program.cpp
+++ b/tools/program.cpp
@@ -49,7 +49,8 @@ static const unordered_map<string, Operation> g_operations {
     { "to-json", Operation::ToJSON },
     { "to-tga", Operation::ToTGA },
     { "to-2da", Operation::To2DA },
-    { "to-gff", Operation::ToGFF }
+    { "to-gff", Operation::ToGFF },
+    { "to-rim", Operation::ToRIM },
 };
 
 Program::Program(int argc, char **argv) : _argc(argc), _argv(argv) {
@@ -93,6 +94,7 @@ void Program::initOptions() {
         ("to-tga", "convert TPC image to TGA")
         ("to-2da", "convert JSON to 2DA")
         ("to-gff", "convert JSON to GFF")
+        ("to-rim", "create RIM archive from directory")
         ("target", po::value<string>(), "target name or path to input file");
 }
 
diff --git a/tools/rimtool.cpp b/tools/rimtool.cpp
index 964c6af5..4d5009a1 100644
--- a/tools/rimtool.cpp
+++ b/tools/rimtool.cpp
@@ -19,6 +19,7 @@
 
 #include <iostream>
 
+#include "../src/resource/format/rimwriter.h"
 #include "../src/resource/typeutil.h"
 
 using namespace std;
@@ -32,13 +33,23 @@ namespace reone {
 namespace tools {
 
 void RimTool::invoke(Operation operation, const fs::path &target, const fs::path &gamePath, const fs::path &destPath) {
-    RimReader rim;
-    rim.load(target);
-
-    if (operation == Operation::List) {
-        list(rim);
-    } else if (operation == Operation::Extract) {
-        extract(rim, destPath);
+    switch (operation) {
+        case Operation::List:
+        case Operation::Extract: {
+            RimReader rim;
+            rim.load(target);
+            if (operation == Operation::List) {
+                list(rim);
+            } else if (operation == Operation::Extract) {
+                extract(rim, destPath);
+            }
+            break;
+        }
+        case Operation::ToRIM:
+            toRIM(target);
+            break;
+        default:
+            break;
     }
 }
 
@@ -65,11 +76,52 @@ void RimTool::extract(RimReader &rim, const fs::path &destPath) {
     }
 }
 
+void RimTool::toRIM(const fs::path &target) {
+    RimWriter rim;
+
+    for (auto &entry : fs::directory_iterator(target)) {
+        fs::path path(entry);
+        if (fs::is_directory(path)) continue;
+
+        string ext(path.extension().string());
+        ext.erase(0, 1);
+
+        ResourceType resType = getResTypeByExt(ext, false);
+        if (resType == ResourceType::Invalid) continue;
+
+        fs::ifstream in(path, ios::binary);
+        in.seekg(0, ios::end);
+        size_t size = in.tellg();
+        ByteArray data(size);
+        in.seekg(0);
+        in.read(&data[0], size);
+
+        fs::path resRef(path.filename());
+        resRef.replace_extension("");
+
+        RimWriter::Resource res;
+        res.resRef = resRef.string();
+        res.resType = resType;
+        res.data = move(data);
+
+        rim.add(move(res));
+    }
+
+    fs::path rimPath(target.parent_path());
+    rimPath.append(target.filename().string() + ".rim");
+    rim.save(rimPath);
+}
+
 bool RimTool::supports(Operation operation, const fs::path &target) const {
-    return
-        !fs::is_directory(target) &&
-        target.extension() == ".rim" &&
-        (operation == Operation::List || operation == Operation::Extract);
+    switch (operation) {
+        case Operation::List:
+        case Operation::Extract:
+            return !fs::is_directory(target) && target.extension() == ".rim";
+        case Operation::ToRIM:
+            return fs::is_directory(target);
+        default:
+            return false;
+    }
 }
 
 } // namespace tools
diff --git a/tools/tools.h b/tools/tools.h
index 818e6b64..9cffc89c 100644
--- a/tools/tools.h
+++ b/tools/tools.h
@@ -86,6 +86,7 @@ public:
 private:
     void list(const resource::RimReader &rim);
     void extract(resource::RimReader &rim, const boost::filesystem::path &destPath);
+    void toRIM(const boost::filesystem::path &target);
 };
 
 class TwoDaTool : public ITool {
diff --git a/tools/types.h b/tools/types.h
index 314e0bd4..18acfbe1 100644
--- a/tools/types.h
+++ b/tools/types.h
@@ -28,7 +28,8 @@ enum class Operation {
     ToJSON,
     ToTGA,
     To2DA,
-    ToGFF
+    ToGFF,
+    ToRIM
 };
 
 } // namespace tools