diff --git a/src/lib/file.cpp b/src/lib/file.cpp
index 38f3e27..5c7863a 100644
--- a/src/lib/file.cpp
+++ b/src/lib/file.cpp
@@ -134,10 +134,7 @@ ErrorOrVoid File::writeByte(uint8_t byte){
     bool failure = false;
 
     try{
-
-        this->fileStream.seekg(this->cursorPosition);
         this->fileStream << byte;
-        this->cursorPosition++;
     }catch(std::exception& e){
         failure = true;
     }
@@ -145,6 +142,29 @@ ErrorOrVoid File::writeByte(uint8_t byte){
     return failure ? ErrorOrVoid(true, ErrorCodes::UNKNOWN) : ErrorOrVoid();
 }
 
+ErrorOrVoid File::write(std::vector<uint8_t> data){
+    bool failure = false;
+
+    try{
+        this->fileStream << std::string(data.begin(), data.end());
+    }catch(std::exception& e){
+        failure = true;
+    }
+
+    return failure ? ErrorOrVoid(true, ErrorCodes::UNKNOWN) : ErrorOrVoid();
+}
+
+ErrorOrVoid File::writeString(tiny_utf8::string data){
+    bool failure = false;
+
+    try{
+        this->fileStream << data;
+    }catch(std::exception& e){
+        failure = true;
+    }
+    return failure ? ErrorOrVoid(true, ErrorCodes::UNKNOWN) : ErrorOrVoid();
+}
+
 ErrorOr<File*> File::open(std::string path, char mode, uint64_t startPosition){
     if (!std::filesystem::exists(path)) {
         return ErrorOr<File*>(true, ErrorCodes::FILE_NOT_FOUND, nullptr);
diff --git a/src/test/file.cpp b/src/test/file.cpp
index 6ec836b..ea49669 100644
--- a/src/test/file.cpp
+++ b/src/test/file.cpp
@@ -47,6 +47,7 @@ int main(){
     File *writeFile;
     File *readFile;
 
+    //writeByte test
     writeFile = File::open("resources/unicode_data/writeTest", 'w').value;
     writeFile->writeByte('a');
     writeFile->close();
@@ -55,4 +56,23 @@ int main(){
     uint8_t testByte = readFile->readByte().value;
     ASSERT(testByte == 'a');
     std::cout << "Passed write byte test." << std::endl;
+
+    //write test
+    writeFile->open();
+    writeFile->write(std::vector<uint8_t>({'a', 'b', 'c'}));
+    writeFile->close();
+
+    readFile->cursorPosition = 0;
+    tiny_utf8::string testBytes = readFile->readString(3).value;
+    ASSERT(testBytes == "abc");
+    std::cout << "Passed write test." << std::endl;
+
+    writeFile->open();
+    writeFile->writeString(tiny_utf8::string("Hallo"));
+    writeFile->close();
+
+    readFile->cursorPosition = 0;
+    tiny_utf8::string testString = readFile->readString(5).value;
+    ASSERT(testString == "Hallo");
+    std::cout << "Passed write string test." << std::endl;
 }