diff --git a/src/base/base.h b/src/base/base.h
index 7263d4b..cbcb3cf 100644
--- a/src/base/base.h
+++ b/src/base/base.h
@@ -10,6 +10,7 @@ extern "C" {
 #include "optime.h"
 #include "type_system/type_system.h"
 #include "../kprint/kprintf.h"
+#include "endian.h"
 
 #if __cplusplus
 }
diff --git a/src/base/endian.c b/src/base/endian.c
new file mode 100644
index 0000000..b6e25f6
--- /dev/null
+++ b/src/base/endian.c
@@ -0,0 +1,13 @@
+#include "endian.h"
+
+static const union
+{
+    uint16 number;
+    Endian bytes[2];
+} _endian_union={ .number=0x0102 };
+
+Endian getEndian(){
+    // if 0x0102 == { 1, 2 } then BigEndian
+    // if 0x0102 == { 2, 1 } then LittleEndian
+    return _endian_union.bytes[1];
+}
diff --git a/src/base/endian.h b/src/base/endian.h
new file mode 100644
index 0000000..9d9d1e7
--- /dev/null
+++ b/src/base/endian.h
@@ -0,0 +1,9 @@
+#include "std.h"
+
+PACK_ENUM(Endian,
+    UnknownEndian=0,
+    LittleEndian=1,
+    BigEndian=2
+);
+
+Endian getEndian();
diff --git a/src/base/type_system/base_toString.c b/src/base/type_system/base_toString.c
index 2d62307..156bc37 100644
--- a/src/base/type_system/base_toString.c
+++ b/src/base/type_system/base_toString.c
@@ -83,18 +83,27 @@ char* toString_float(float64 n, bool withPostfix, bool uppercase){
     return cptr_copy("<float>");
 }
 
-char* toString_bin(void* _bytes, uint32 size, bool withPrefix){
+char* toString_bin(void* _bytes, uint32 size, bool inverse, bool withPrefix){
     char* bytes=_bytes;
     char* str=malloc(size*8 + (withPrefix?2:0) +1);
-    uint32 cn=0;
+    uint32 cn=0; // char number
     if(withPrefix){
         str[cn++]='0';
         str[cn++]='b';
     }
-    for(uint32 bn=0; bn<size; bn++){
-        unsigned char byte=bytes[bn];
-        for(uint8 i=0; i<8; i++)
-            str[cn++]='0' + (byte & (char)128>>i);
+    if(inverse){
+        for(int32 bn=size-1; bn>=0; bn--){ // byte number
+            unsigned char byte=bytes[bn];
+            for(uint8 i=0; i<8; i++)
+                str[cn++]='0' + (byte & (char)128>>i);
+        }
+    }
+    else{
+        for(uint32 bn=0; bn<size; bn++){
+            unsigned char byte=bytes[bn];
+            for(uint8 i=0; i<8; i++)
+                str[cn++]='0' + (byte & (char)128>>i);
+        }
     }
     str[cn]=0;
     return str;
@@ -115,18 +124,29 @@ char _4bitsHex(uint8 u, bool uppercase){
     }
 }
 
-char* toString_hex(void* _bytes, uint32 size, bool withPrefix, bool uppercase){
+char* toString_hex(void* _bytes, uint32 size, bool inverse, bool withPrefix, bool uppercase){
     char* bytes=_bytes;
     char* str=malloc(size*2 + (withPrefix?2:0) + 1);
-    uint32 cn=0;
+    uint32 cn=0; // char number
     if(withPrefix){
         str[cn++]='0';
         str[cn++]='x';
     }
-    for(uint32 bn=0; bn<size; bn++){
-        unsigned char byte=bytes[bn];
-        str[cn++]=_4bitsHex(byte%16, uppercase);
-        str[cn++]=_4bitsHex(byte/16, uppercase);
+    // left to right
+    if(inverse){
+        for(int32 bn=size-1; bn>=0; bn--){ // byte number
+            unsigned char byte=bytes[bn];
+            str[cn++]=_4bitsHex(byte/16, uppercase);
+            str[cn++]=_4bitsHex(byte%16, uppercase);
+        }
+    }
+    // right to left
+    else {
+        for(int32 bn=0; bn<size; bn++){ // byte number
+            unsigned char byte=bytes[bn];
+            str[cn++]=_4bitsHex(byte/16, uppercase);
+            str[cn++]=_4bitsHex(byte%16, uppercase);
+        }
     }
     str[cn]=0;
     return str;
@@ -139,9 +159,9 @@ char* toString_hex(void* _bytes, uint32 size, bool withPrefix, bool uppercase){
             int##BITS n=*(int##BITS*)_n;\
             return toString_int(n);\
         case kp_b:\
-            return toString_bin(_n, BITS/8, kp_fmt_withPrefix(f));\
+            return toString_bin(_n, BITS/8, getEndian()==LittleEndian, kp_fmt_withPrefix(f));\
         case kp_h:\
-            return toString_hex(_n, BITS/8, kp_fmt_withPrefix(f), kp_fmt_isUpper(f));\
+            return toString_hex(_n, BITS/8, getEndian()==LittleEndian, kp_fmt_withPrefix(f), kp_fmt_isUpper(f));\
         default:\
             kprintf("\n%u\n", kp_fmt_dataFormat(f));\
             throw(ERR_FORMAT);\
@@ -159,9 +179,9 @@ __toString_int_def(64)
             uint##BITS n=*(uint##BITS*)_n;\
             return toString_uint(n, kp_fmt_withPostfix(f), kp_fmt_isUpper(f));\
         case kp_b:\
-            return toString_bin(_n, BITS/8, kp_fmt_withPrefix(f));\
+            return toString_bin(_n, BITS/8, getEndian()==LittleEndian, kp_fmt_withPrefix(f));\
         case kp_h:\
-            return toString_hex(_n, BITS/8, kp_fmt_withPrefix(f), kp_fmt_isUpper(f));\
+            return toString_hex(_n, BITS/8, getEndian()==LittleEndian, kp_fmt_withPrefix(f), kp_fmt_isUpper(f));\
         default:\
             kprintf("\n%u\n", kp_fmt_dataFormat(f));\
             throw(ERR_FORMAT);\
@@ -179,9 +199,9 @@ __toString_uint_def(64)
             float##BITS n=*(float##BITS*)_n;\
             return toString_float(n, kp_fmt_withPostfix(f), kp_fmt_isUpper(f));\
         case kp_b:\
-            return toString_bin(_n, BITS/8, kp_fmt_withPrefix(f));\
+            return toString_bin(_n, BITS/8, getEndian()==LittleEndian, kp_fmt_withPrefix(f));\
         case kp_h:\
-            return toString_hex(_n, BITS/8, kp_fmt_withPrefix(f), kp_fmt_isUpper(f));\
+            return toString_hex(_n, BITS/8, getEndian()==LittleEndian, kp_fmt_withPrefix(f), kp_fmt_isUpper(f));\
         default:\
             kprintf("\n%u\n", kp_fmt_dataFormat(f));\
             throw(ERR_FORMAT);\
diff --git a/src/base/type_system/base_toString.h b/src/base/type_system/base_toString.h
index bc3f58b..4f99771 100644
--- a/src/base/type_system/base_toString.h
+++ b/src/base/type_system/base_toString.h
@@ -25,11 +25,12 @@ char* __toString_uint64(void* n, uint32 fmt);
 
 char* toString_float(float64 n, bool withPostfix, bool uppercase); // very bad implimentation
 char* __toString_float32(void* n, uint32 fmt);
-char* __toString_float64(void* n, uint32 fmt);
+char* __toString_float64(void* n, uint32 fmt); 
 
-// universal functions
-char* toString_bin(void* bytes, uint32 size, bool withPrefix);
-char* toString_hex(void* bytes, uint32 size, bool withPrefix, bool uppercase);
+///@param inverse set to true for little endian numbers (their bytes are in reverse order)
+char* toString_bin(void* bytes, uint32 size, bool inverse, bool withPrefix);
+///@param inverse set to true for little endian numbers (their bytes are in reverse order)
+char* toString_hex(void* bytes, uint32 size, bool inverse, bool withPrefix, bool uppercase);
 
 #if __cplusplus
 }
diff --git a/src/kprint/kprintf.c b/src/kprint/kprintf.c
index c39073d..cab22b5 100644
--- a/src/kprint/kprintf.c
+++ b/src/kprint/kprintf.c
@@ -93,7 +93,7 @@ void kprintf(const char* format, ...){
                 case 'p':
                 case 'x': ;
                     uint64 px=va_arg(vl, uint64);
-                    argstr=toString_hex(&px,sizeof(px),1,0);
+                    argstr=toString_hex(&px,getEndian()==LittleEndian,sizeof(px),1,0);
                     break;
                 case 's': ;
                     char* cptr=va_arg(vl,char*);