diff --git a/tool/n64savetool/mempak_format.c b/tool/n64savetool/mempak_format.c
index 7aff6a7..2652c46 100644
--- a/tool/n64savetool/mempak_format.c
+++ b/tool/n64savetool/mempak_format.c
@@ -1,30 +1,75 @@
 #include <stdio.h>
+#include <getopt.h>
 #include "mempak.h"
 
+#define DEFAULT_FORMAT_STR	"n64"
+
+static void print_usage(void)
+{
+	printf("Usage: ./mempak_format file <options>\n");
+	printf("\n");
+	printf("Options:\n");
+	printf("   -h                Display help\n");
+	printf("   -f format         Write file in specified format (default: %s)\n", DEFAULT_FORMAT_STR);
+	printf("\n");
+	printf("Formats:\n");
+	printf("   mpk               Standard 32kB .mpk file format\n");
+	printf("   mpk4              128kB .mpk file (4 copies or the 32kB block)\n");
+	printf("   n64               .N64 file format\n");
+}
 
 int main(int argc, char **argv)
 {
 	mempak_structure_t *mpk;
 	const char *outfile;
 	unsigned char type;
+	struct option long_options[] = {
+		{ "format", required_argument, 0, 'f' },
+		{ "help", no_argument, 0, 'h' },
+		{ }, // terminator
+	};
+	const char *format = DEFAULT_FORMAT_STR;
 
 	if (argc < 2) {
-		printf("Usage: ./mempak_format file\n");
-		printf("\n");
-		printf("Raw files (.MPK, .BIN) and Dexdrive (.N64) formats accepted.\n");
+		print_usage();
 		return 1;
 	}
 
-	outfile = argv[1];
+	while(1) {
+		int c;
+
+		c = getopt_long(argc, argv, "f:h", long_options, NULL);
+		if (c==-1)
+			break;
+
+		switch(c)
+		{
+			case 'h':
+				print_usage();
+				return 0;
+
+			case 'f':
+				format = optarg;
+				break;
+		}
+	}
+
+	type = mempak_string2format(format);
+	if (type == MPK_FORMAT_INVALID) {
+		fprintf(stderr, "Unknown format specified\n");
+		return -1;
+	}
+
+	outfile = argv[optind];
 	mpk = mempak_new();
 	if (!mpk) {
 		return 1;
 	}
 
-	type = MPK_FORMAT_N64;
 	mempak_saveToFile(mpk, outfile, type);
-
 	mempak_free(mpk);
 
+	printf("Wrote empty (formatted) memory card file '%s' in '%s' format\n", outfile, mempak_format2string(type));
+
 	return 0;
 }