diff --git a/engine.c b/engine.c
index b3dd0200..82b9af99 100644
--- a/engine.c
+++ b/engine.c
@@ -58,48 +58,6 @@ Func_effect Effect_function_before_cancel;
 ///This table holds pointers to the saved window backgrounds. We can have up to 8 windows open at a time.
 byte* Window_background[8];
 
-///Disables all the effects
-void Cancel_effects(void)
-{
-  Shade_mode_before_cancel=Shade_mode;
-  Shade_mode=0;
-
-  Quick_shade_mode_before_cancel=Quick_shade_mode;
-  Quick_shade_mode=0;
-
-  Stencil_mode_before_cancel=Stencil_mode;
-  Stencil_mode=0;
-
-  Sieve_mode_before_cancel=Sieve_mode;
-  Sieve_mode=0;
-
-  Colorize_mode_before_cancel=Colorize_mode;
-  Colorize_mode=0;
-
-  Smooth_mode_before_cancel=Smooth_mode;
-  Smooth_mode=0;
-
-  Tiling_mode_before_cancel=Tiling_mode;
-  Tiling_mode=0;
-
-  Effect_function_before_cancel=Effect_function;
-  Effect_function=No_effect;
-}
-
-
-///Get the effects and drawing modes back
-void Restore_effects(void)
-{
-  Shade_mode      =Shade_mode_before_cancel;
-  Quick_shade_mode=Quick_shade_mode_before_cancel;
-  Stencil_mode    =Stencil_mode_before_cancel;
-  Sieve_mode      =Sieve_mode_before_cancel;
-  Colorize_mode   =Colorize_mode_before_cancel;
-  Smooth_mode     =Smooth_mode_before_cancel;
-  Tiling_mode     =Tiling_mode_before_cancel;
-  Effect_function  =Effect_function_before_cancel;
-}
-
 
 ///Table of tooltip texts for menu buttons
 char * Menu_tooltip[NB_BUTTONS]=
diff --git a/engine.h b/engine.h
index 5fbe8990..855c361a 100644
--- a/engine.h
+++ b/engine.h
@@ -22,17 +22,15 @@
 /// Utility functions for the menu and all windows.
 //////////////////////////////////////////////////////////////////////////////
 
-void Main_handler            (void);
+void Main_handler          (void);
 void Draw_menu_button_frame(byte btn_number,byte pressed);
-void Unselect_button          (int btn_number);
-void Select_button             (int btn_number,byte click);
-void Cancel_effects            (void);
-void Restore_effects          (void);
-void Open_window                (word width,word height, char * title);
-void Close_window                (void);
+void Unselect_button       (int btn_number);
+void Select_button         (int btn_number,byte click);
+void Open_window           (word width,word height, char * title);
+void Close_window          (void);
 
-void Open_popup                  (word x_pos, word y_pos, word width, word height);
-void Close_popup                  (void);
+void Open_popup            (word x_pos, word y_pos, word width, word height);
+void Close_popup           (void);
 
 void Window_draw_normal_bouton(word x_pos,word y_pos,word width,word height,
                                     char * title,byte undersc_letter,byte clickable);
diff --git a/io.c b/io.c
index fb1b568f..fe210fb6 100644
--- a/io.c
+++ b/io.c
@@ -39,23 +39,6 @@
 #include "io.h"
 #include "realpath.h"
 
-word Endian_magic16(word x)
-{
-  #if SDL_BYTEORDER == SDL_LIL_ENDIAN
-    return x;
-  #else
-    return SDL_Swap16(x);
-  #endif
-}
-dword Endian_magic32(dword x)
-{
-  #if SDL_BYTEORDER == SDL_LIL_ENDIAN
-    return x;
-  #else
-    return SDL_Swap32(x);
-  #endif
-}
-
 // Lit un octet
 // Renvoie -1 si OK, 0 en cas d'erreur
 int Read_byte(FILE *file, byte *dest)
diff --git a/io.h b/io.h
index 17508393..f63aa54f 100644
--- a/io.h
+++ b/io.h
@@ -31,11 +31,6 @@
 /// If you don't, you break another platform.
 //////////////////////////////////////////////////////////////////////////////
 
-/// Returns x, swapped if the current target is low-endian. Deprecated, please don't use it.
-word  Endian_magic16(word x);
-/// Returns x, swapped if the current target is low-endian. Deprecated, please don't use it.
-dword Endian_magic32(dword x);
-
 /// Reads a single byte from an open file. Returns true if OK, false if a file i/o error occurred.
 int Read_byte(FILE *file, byte *dest);
 /// Writes a single byte to an open file. Returns true if OK, false if a file i/o error occurred.
diff --git a/loadsave.c b/loadsave.c
index d0127e7c..356399af 100644
--- a/loadsave.c
+++ b/loadsave.c
@@ -5528,20 +5528,8 @@ void Save_PC1(void)
   }
 }
 
-/******************************************************************************************
-  Functions from op_c.c : load raw 24B (for testing) and load_tga (broken ? incomplete ?)
-  Saving would be nice as well.
-******************************************************************************************/
-void Load_RAW_24b(int width,int height,T_Bitmap24B source)
-{
-  FILE* file;
-
-  file=fopen("TEST.RAW","rb");
-  if (Read_bytes(file,source,width*height*sizeof(T_Components)))
-    exit(3);
-  fclose(file);
-}
 
+/// UNUSED and UNTESTED function to load a TGA file.
 void Load_TGA(char * fname,T_Bitmap24B * dest,int * width,int * height)
 {
   FILE* fichier;
diff --git a/misc.c b/misc.c
index fb3b9f2e..111d3d16 100644
--- a/misc.c
+++ b/misc.c
@@ -774,22 +774,6 @@ void Num2str(dword number,char * str,byte nb_char)
   str[nb_char]='\0';
 }
 
-// Transformer une chaîne en un entier naturel (renvoie -1 si ch. invalide)
-int Str2num(char * str)
-{
-  int value=0;
-
-  for (;*str;str++)
-  {
-    if ( (*str>='0') && (*str<='9') )
-      value=(value*10)+(*str-'0');
-    else
-      return -1;
-  }
-  return value;
-}
-
-
 // Arrondir un nombre réel à la valeur entière la plus proche
 short Round(float value)
 {
diff --git a/misc.h b/misc.h
index 696e9edf..b12ff1b5 100644
--- a/misc.h
+++ b/misc.h
@@ -143,7 +143,6 @@ byte New_preview_is_needed; // Bool
 unsigned long Memory_free(void);
 
 void  Num2str(dword number,char * str,byte nb_char);
-int   Str2num(char * str);
 
 short Round(float value);
 short Round_div_max(short numerator,short divisor);
diff --git a/op_c.c b/op_c.c
index 7d5dff5b..687dc260 100644
--- a/op_c.c
+++ b/op_c.c
@@ -304,17 +304,6 @@ int OT_get(T_Occurrence_table * t,int r,int g,int b)
   return t->table[index];
 }
 
-void OT_set(T_Occurrence_table * t,int r,int g,int b,int i)
-{
-  int index;
-
-  r=(r>>t->red_r);
-  g=(g>>t->red_g);
-  b=(b>>t->red_b);
-  index=(r<<t->dec_r) | (g<<t->dec_g) | (b<<t->dec_b);
-  t->table[index]=i;
-}
-
 void OT_inc(T_Occurrence_table * t,int r,int g,int b)
 {
   int index;
diff --git a/op_c.h b/op_c.h
index 21ebc59c..ebd943fe 100644
--- a/op_c.h
+++ b/op_c.h
@@ -165,7 +165,6 @@ void OT_init(T_Occurrence_table * t);
 T_Occurrence_table * OT_new(int nbb_r,int nbb_g,int nbb_b);
 void OT_delete(T_Occurrence_table * t);
 int OT_get(T_Occurrence_table * t,int r,int g,int b);
-void OT_set(T_Occurrence_table * t,int r,int g,int b,int i);
 void OT_inc(T_Occurrence_table * t,int r,int g,int b);
 void OT_count_occurrences(T_Occurrence_table * t,T_Bitmap24B image,int size);
 
diff --git a/pages.c b/pages.c
index f52f3129..66407e95 100644
--- a/pages.c
+++ b/pages.c
@@ -228,30 +228,6 @@ void Download_infos_backup(T_List_of_pages * list)
     FX_feedback_screen=list->Pages[1].Image;
 }
 
-int Allocate_page(T_Page * page,int width,int height)
-{
-  // Important: la T_Page ne doit pas déjà désigner une page allouée auquel
-  //            cas celle-ci serait perdue.
-
-  /* Debug : if (page->Image!=NULL) exit(666); */
-
-  // On alloue la mémoire pour le bitmap
-  page->Image=(byte *)malloc(width*height);
-
-  // On vérifie que l'allocation se soit bien passée
-  if (page->Image==NULL)
-    return 0; // Echec
-  else
-  {
-    page->Width=width;
-    page->Height=height;
-    // Important: La mise à jour des autres infos est du ressort de
-    //            l'appelant.
-
-    return 1; // Succès
-  }
-}
-
 void Free_a_page(T_Page * page)
 {
   // On peut appeler cette fonction sur une page non allouée.
@@ -730,23 +706,6 @@ int Init_all_backup_lists(int size,int width,int height)
   return return_code;
 }
 
-void Free_all_backup_lists(void)
-{
-  // On commence par supprimer les pages une à une dans chacune des listes
-    // Liste de la page principale
-  while (Main_backups->Nb_pages_allocated>0)
-    Free_last_page_of_list(Main_backups);
-    // Liste de la page de brouillon
-  while (Spare_backups->Nb_pages_allocated>0)
-    Free_last_page_of_list(Spare_backups);
-
-  // Puis on peut détruire les structures de liste elles-mêmes
-  Free_a_list_of_pages(Main_backups);
-  Free_a_list_of_pages(Spare_backups);
-  free(Main_backups);
-  free(Spare_backups);
-}
-
 void Set_number_of_backups(int nb_backups)
 {
   Change_page_number_of_list(Main_backups,nb_backups+1);
diff --git a/pages.h b/pages.h
index 288bb249..efc816e5 100644
--- a/pages.h
+++ b/pages.h
@@ -41,7 +41,6 @@ void Upload_infos_page_main(T_Page * page);
 void Download_infos_page_spare(T_Page * page);
 void Upload_infos_page_spare(T_Page * page);
 void Download_infos_backup(T_List_of_pages * list);
-int Allocate_page(T_Page * page,int width,int height);
 void Free_a_page(T_Page * page);
 void Copy_S_page(T_Page * dest,T_Page * source);
 int Size_of_a_page(T_Page * page);
@@ -71,7 +70,6 @@ void Free_page_of_a_list(T_List_of_pages * list);
   ///
 
 int Init_all_backup_lists(int size,int width,int height);
-void Free_all_backup_lists(void);
 void Set_number_of_backups(int nb_backups);
 int Backup_with_new_dimensions(int upload,int width,int height);
 int Backup_and_resize_the_spare(int width,int height);
diff --git a/sdlscreen.c b/sdlscreen.c
index d45da51e..6dd348d4 100644
--- a/sdlscreen.c
+++ b/sdlscreen.c
@@ -191,12 +191,6 @@ byte Get_SDL_pixel_8(SDL_Surface *bmp, int x, int y)
   return ((byte *)(bmp->pixels))[(y*bmp->pitch+x)];
 }
 
-void Clear_screen(byte color)
-{
-  memset(Screen_SDL->pixels,color,Screen_SDL->pitch*Screen_SDL->h);
-  Update_rect(0,0,0,0);
-}
-
 void Clear_border(byte color)
 {
   int width;
diff --git a/sdlscreen.h b/sdlscreen.h
index cffd48c8..de674193 100644
--- a/sdlscreen.h
+++ b/sdlscreen.h
@@ -46,9 +46,6 @@ byte * Surface_to_bytefield(SDL_Surface *source, byte * dest);
 SDL_Color Color_to_SDL_color(byte);
 byte Get_SDL_pixel_8(SDL_Surface *bmp, int x, int y);
 
-/// Fills the SDL screen with a given color
-void Clear_screen(byte color);
-
 ///
 /// Clears the parts of screen that are outside of the editing area.
 /// There is such area only if the screen mode is not a multiple of the pixel
diff --git a/windows.c b/windows.c
index 000e70bc..e6a32213 100644
--- a/windows.c
+++ b/windows.c
@@ -462,8 +462,7 @@ void Print_general(short x,short y,const char * str,byte text_color,byte backgro
   }
 }
 
-  // -- Afficher un caractère dans une fenêtre --
-
+/// Draws a char in a window
 void Print_char_in_window(short x_pos,short y_pos,const unsigned char c,byte text_color,byte background_color)
 {
   short x,y;
@@ -480,28 +479,7 @@ void Print_char_in_window(short x_pos,short y_pos,const unsigned char c,byte tex
             (*(pixel++)?text_color:background_color));
 }
 
-  // -- Afficher un caractère sans fond dans une fenêtre --
-
-void Print_transparent_char_in_window(short x_pos,short y_pos,const unsigned char c,byte color)
-{
-  short x,y;
-  byte *pixel;
-  x_pos=(x_pos*Menu_factor_X)+Window_pos_X;
-  y_pos=(y_pos*Menu_factor_Y)+Window_pos_Y;
-  // Premier pixel du caractère
-  pixel=Menu_font + (c<<6);
-  
-  for (y=0;y<8;y++)
-    for (x=0;x<8;x++)
-    {
-      if (*(pixel++))
-        Block(x_pos+(x*Menu_factor_X), y_pos+(y*Menu_factor_Y),
-              Menu_factor_X, Menu_factor_Y, color);
-    }
-}
-
-  // -- Afficher une chaîne dans une fenêtre, avec taille maxi --
-
+///Draws a char in a window, checking for bounds
 void Print_in_window_limited(short x,short y,const char * str,byte size,byte text_color,byte background_color)
 {
   char display_string[256];
@@ -515,8 +493,7 @@ void Print_in_window_limited(short x,short y,const char * str,byte size,byte tex
   Print_in_window(x, y, display_string, text_color, background_color);
 }
 
-  // -- Afficher une chaîne dans une fenêtre --
-
+/// Draws a string in a window
 void Print_in_window(short x,short y,const char * str,byte text_color,byte background_color)
 {
   Print_general((x*Menu_factor_X)+Window_pos_X,
@@ -525,17 +502,15 @@ void Print_in_window(short x,short y,const char * str,byte text_color,byte backg
   Update_rect(x*Menu_factor_X+Window_pos_X,y*Menu_factor_Y+Window_pos_Y,8*Menu_factor_X*strlen(str),8*Menu_factor_Y);
 }
 
-  // -- Afficher une chaîne dans le menu --
-
+// Draws a string in the menu's status bar
 void Print_in_menu(const char * str, short position)
 {
   Print_general((18+(position<<3))*Menu_factor_X,Menu_status_Y,str,MC_Black,MC_Light);
   Update_rect((18+(position<<3))*Menu_factor_X,Menu_status_Y,strlen(str)*8*Menu_factor_X,8*Menu_factor_Y);
 }
 
-  // -- Afficher les coordonnées du pinceau dans le menu --
-
-// Note : cette fonction n'affiche que les chiffres, pas les X: Y: qui sont dans la gestion principale, car elle est apellée très souvent.
+/// Draws the mouse coordinates on the menu
+/// Only update the digits and doesn't refresh the "X: Y:" labels. This function needs to be fast as it is called each time the mouse moves.
 void Print_coordinates(void)
 {
   char temp[5];
diff --git a/windows.h b/windows.h
index 24b6527f..6a291eb1 100644
--- a/windows.h
+++ b/windows.h
@@ -61,7 +61,6 @@ void Print_general(short x,short y,const char * str,byte text_color,byte backgro
 void Print_in_window(short x,short y,const char * str,byte text_color,byte background_color);
 void Print_in_window_limited(short x,short y,const char * str,byte size,byte text_color,byte background_color);
 void Print_char_in_window(short x_pos,short y_pos,const unsigned char c,byte text_color,byte background_color);
-void Print_transparent_char_in_window(short x_pos,short y_pos,const unsigned char c,byte color);
 void Print_in_menu(const char * str, short position);
 void Print_coordinates(void);
 void Print_filename(void);