diff --git a/include/base/baseN.hpp b/include/base/baseN.hpp
index 4d97f3f..2a1597b 100644
--- a/include/base/baseN.hpp
+++ b/include/base/baseN.hpp
@@ -7,13 +7,13 @@
 namespace baseN
 {
     bool isValid(const char *str, const int8_t *map) noexcept;
-    bool isValid(const std::string &str, const int8_t *map) noexcept;
+    bool isValid(std::string_view str, const int8_t *map) noexcept;
 
     void encode(const uint8_t *data, uint64_t data_size, char *str, uint8_t base, const char *digits, uint64_t enc_size) noexcept;
     std::string encode(const std::vector<uint8_t> &data, uint8_t base, const char *digits, uint64_t enc_size) noexcept;
     std::string encode(const std::vector<uint8_t> &data, uint8_t base, const char *digits) noexcept;
 
     void decode(const char *str, uint8_t *data, uint64_t data_size, uint8_t base, const char *digits, const int8_t *map, uint64_t dec_size);
-    std::vector<uint8_t> decode(const std::string &str, uint8_t base, const char *digits, const int8_t *map, uint64_t dec_size);
-    std::vector<uint8_t> decode(const std::string &str, uint8_t base, const char *digits, const int8_t *map);
+    std::vector<uint8_t> decode(std::string_view str, uint8_t base, const char *digits, const int8_t *map, uint64_t dec_size);
+    std::vector<uint8_t> decode(std::string_view str, uint8_t base, const char *digits, const int8_t *map);
 }
\ No newline at end of file
diff --git a/include/base/hex.hpp b/include/base/hex.hpp
index 7b8956a..9070d1e 100644
--- a/include/base/hex.hpp
+++ b/include/base/hex.hpp
@@ -7,9 +7,9 @@
 namespace hex
 {
     bool isValid(const char *str) noexcept;
-    bool isValid(const std::string &str) noexcept;
+    bool isValid(std::string_view str) noexcept;
     void encode(const uint8_t *data, uint64_t data_size, char *str) noexcept;
     std::string encode(const std::vector<uint8_t> &data) noexcept;
     void decode(const char *str, uint8_t *data, uint64_t data_size);
-    std::vector<uint8_t> decode(const std::string &str);
+    std::vector<uint8_t> decode(std::string_view str);
 }
\ No newline at end of file
diff --git a/src/baseN.cpp b/src/baseN.cpp
index eef2893..d17561f 100644
--- a/src/baseN.cpp
+++ b/src/baseN.cpp
@@ -12,7 +12,7 @@ namespace baseN
         return std::all_of(sv.begin(), sv.end(), [map](char ch)
                            { return map[(int8_t)ch] != -1; });
     }
-    bool isValid(const std::string &str, const int8_t *map) noexcept
+    bool isValid(std::string_view str, const int8_t *map) noexcept
     {
         return baseN::isValid(str.data(), map);
     }
@@ -122,7 +122,7 @@ namespace baseN
         }
         std::copy(res_data, res_data + std::min(dec_size, data_size), data);
     }
-    std::vector<uint8_t> decode(const std::string &str, uint8_t base, const char *digits, const int8_t *map, uint64_t dec_size)
+    std::vector<uint8_t> decode(std::string_view str, uint8_t base, const char *digits, const int8_t *map, uint64_t dec_size)
     {
         std::vector<uint8_t> data(dec_size);
         baseN::decode(str.data(), data.data(), data.size(), base, digits, map, dec_size);
@@ -131,7 +131,7 @@ namespace baseN
                                      { return byte != 0; }));
         return data;
     }
-    std::vector<uint8_t> decode(const std::string &str, uint8_t base, const char *digits, const int8_t *map)
+    std::vector<uint8_t> decode(std::string_view str, uint8_t base, const char *digits, const int8_t *map)
     {
         return baseN::decode(str, base, digits, map, str.size() * std::log(base) / std::log(256) + 1);
     }
diff --git a/src/hex.cpp b/src/hex.cpp
index 9ce8feb..c1c1c2b 100644
--- a/src/hex.cpp
+++ b/src/hex.cpp
@@ -31,7 +31,7 @@ namespace hex
     {
         return baseN::isValid(str, hexmap);
     }
-    bool isValid(const std::string &str) noexcept
+    bool isValid(std::string_view str) noexcept
     {
         return baseN::isValid(str, hexmap);
     }
@@ -70,7 +70,7 @@ namespace hex
             data[i] = hexmap[(int8_t)sv[i * 2]] << 4 | hexmap[(int8_t)sv[i * 2 + 1]];
         }
     }
-    std::vector<uint8_t> decode(const std::string &str)
+    std::vector<uint8_t> decode(std::string_view str)
     {
         std::vector<uint8_t> data(str.size() / 2);
         hex::decode(str.data(), data.data(), data.size());