diff --git a/libft/ft_itoa_base.c b/libft/ft_itoa_base.c
new file mode 100644
index 00000000..e99f887f
--- /dev/null
+++ b/libft/ft_itoa_base.c
@@ -0,0 +1,45 @@
+#include "libft.h"
+
+static size_t	ft_size(int n, int base)
+{
+	size_t	i;
+
+	i = 1;
+	while (n /= base)
+		i++;
+	return (i);
+}
+
+char	*ft_itoa_base(int nbr, char *base, char *flags)
+{
+	int		i;
+	int		neg;
+	int		base_size;
+	char	*str;
+
+	i = 0;
+	base_size = ft_strlen(base);
+	str = ft_strnew(ft_size(nbr, base_size) + 1);
+	neg = 0;
+	if (nbr < 0)
+		neg = 1;
+	if (nbr == 0)
+	{
+		str[i++] = '0';
+		str[i] = '\0';
+		return (str);
+	}
+	while (nbr)
+	{
+		str[i++] = base[FT_ABS(nbr % base_size)];
+		nbr = nbr / base_size;
+	}
+	if (neg)
+		str[i++] = '-';
+	else if (ft_strchr(flags, '+'))
+		str[i++] = '+';
+	else if (ft_strchr(flags, ' '))
+		str[i++] = ' ';
+	str[i] = '\0';
+	return (ft_strrev(str));
+}
diff --git a/libft/ft_lltoa_base.c b/libft/ft_lltoa_base.c
new file mode 100644
index 00000000..62d9f8e5
--- /dev/null
+++ b/libft/ft_lltoa_base.c
@@ -0,0 +1,45 @@
+#include "libft.h"
+
+static size_t	ft_size(long long n, int base)
+{
+	size_t	i;
+
+	i = 1;
+	while (n /= base)
+		i++;
+	return (i);
+}
+
+char	*ft_lltoa_base(long long nbr, char *base, char *flags)
+{
+	int		i;
+	int		neg;
+	int		base_size;
+	char	*str;
+
+	i = 0;
+	base_size = ft_strlen(base);
+	str = ft_strnew(ft_size(nbr, base_size) + 1);
+	neg = 0;
+	if (nbr < 0)
+		neg = 1;
+	if (nbr == 0)
+	{
+		str[i++] = '0';
+		str[i] = '\0';
+		return (str);
+	}
+	while (nbr)
+	{
+		str[i++] = base[FT_ABS(nbr % base_size)];
+		nbr = nbr / base_size;
+	}
+	if (neg)
+		str[i++] = '-';
+	else if (ft_strchr(flags, '+'))
+		str[i++] = '+';
+	else if (ft_strchr(flags, ' '))
+		str[i++] = ' ';
+	str[i] = '\0';
+	return (ft_strrev(str));
+}
diff --git a/libft/ft_uitoa_base.c b/libft/ft_uitoa_base.c
new file mode 100644
index 00000000..7bd838ae
--- /dev/null
+++ b/libft/ft_uitoa_base.c
@@ -0,0 +1,37 @@
+#include "libft.h"
+
+static size_t	ft_size(unsigned int n, int base)
+{
+	size_t	i;
+
+	i = 1;
+	while (n /= base)
+		i++;
+	return (i);
+}
+
+char	*ft_uitoa_base(unsigned int nbr, char *base)
+{
+	int		i;
+	int		base_size;
+	char	*str;
+
+	/* printf("converting %llu to base %s\n", nbr, base); */
+	/* fflush(stdout); */
+	i = 0;
+	base_size = ft_strlen(base);
+	str = ft_strnew(ft_size(nbr, base_size) + 1);
+	if (nbr == 0)
+	{
+		str[i++] = '0';
+		str[i] = '\0';
+		return (str);
+	}
+	while (nbr)
+	{
+		str[i++] = base[nbr % base_size];
+		nbr = nbr / base_size;
+	}
+	str[i] = '\0';
+	return (ft_strrev(str));
+}
diff --git a/libft/ft_ulltoa_base.c b/libft/ft_ulltoa_base.c
new file mode 100644
index 00000000..e442c610
--- /dev/null
+++ b/libft/ft_ulltoa_base.c
@@ -0,0 +1,38 @@
+#include "libft.h"
+
+static size_t	ft_size(unsigned long long n, int base)
+{
+	size_t	i;
+
+	i = 1;
+	while (n /= base)
+		i++;
+	return (i);
+}
+
+char	*ft_ulltoa_base(unsigned long long nbr, char *base)
+{
+	int		i;
+	int		base_size;
+	char	*str;
+
+	/* printf("converting %llu to base %s\n", nbr, base); */
+	/* fflush(stdout); */
+	i = 0;
+	base_size = ft_strlen(base);
+	str = ft_strnew(ft_size(nbr, base_size) + 1);
+	if (nbr == 0)
+	{
+		str[i++] = '0';
+		str[i] = '\0';
+		return (str);
+	}
+	while (nbr)
+	{
+		str[i++] = base[nbr % base_size];
+		nbr = nbr / base_size;
+	}
+	str[i] = '\0';
+	return (ft_strrev(str));
+}
+