diff --git a/include/basen/hex.hpp b/include/basen/hex.hpp
index de4a6d2..3dc2412 100644
--- a/include/basen/hex.hpp
+++ b/include/basen/hex.hpp
@@ -14,24 +14,24 @@ namespace hex
     bool isValid(std::string_view str) noexcept;
 
     /**
-     * @throw std::overflow_error if if there is an overflow
+     * @throw basen::Exception(OVERFLOW) if if there is an overflow
      */
     size_t sizeEncoded(std::span<const uint8_t> data);
     size_t sizeDecoded(std::string_view str) noexcept;
 
     /**
-     * @throw std::length_error if not enough allocated length
+     * @throw basen::Exception(LENGTH) if not enough allocated length
      * @warning contain leading zeros, returns count of them
      */
     void encode(const uint8_t *data, size_t data_size, char *str, size_t str_size);
-    std::string encode(std::span<const uint8_t> data) noexcept;
+    std::string encode(std::span<const uint8_t> data);
 
     /**
-     * @throw std::length_error if not enough allocated length
-     * @throw std::logic_error if out of digits map
-     * @throw std::logic_error if str_size %2 != 0 (isn't hex)
+     * @throw basen::Exception(LENGTH) if not enough allocated length
+     * @throw basen::Exception(OUT_OF_ALPH) if out of digits map
+     * @throw basen::Exception(PADDING) if str_size %2 != 0 (isn't hex)
      * @warning contain leading zeros, returns count of them
      */
     void decode(const char *str, size_t str_size, uint8_t *data, size_t data_size);
-    std::vector<uint8_t> decode(std::string_view str) noexcept;
+    std::vector<uint8_t> decode(std::string_view str);
 }
\ No newline at end of file
diff --git a/src/hex.cpp b/src/hex.cpp
index eaaf018..62b5c43 100644
--- a/src/hex.cpp
+++ b/src/hex.cpp
@@ -2,6 +2,7 @@
 #include <stdexcept>
 
 #include <basen/baseN.hpp>
+#include <basen/Exception.hpp>
 #include <basen/hex.hpp>
 
 namespace hex
@@ -38,7 +39,7 @@ namespace hex
     {
         if (data.size() > std::numeric_limits<size_t>::max() / 2)
         {
-            throw std::overflow_error("hex::sizeEncoded: overflow");
+            throw basen::Exception(basen::Exception::Code::OVERFLOW);
         }
         return data.size() * 2;
     }
@@ -50,7 +51,7 @@ namespace hex
     {
         if (str_size < hex::sizeEncoded(std::span<const uint8_t>(data, data_size)))
         {
-            throw std::length_error("hex::encode: not enough allocated length");
+            throw basen::Exception(basen::Exception::Code::LENGTH);
         }
         for (size_t i = 0; i < data_size; i++)
         {
@@ -58,7 +59,7 @@ namespace hex
             str[i * 2 + 1] = digits[data[i] & 0x0F];
         }
     }
-    std::string encode(std::span<const uint8_t> data) noexcept
+    std::string encode(std::span<const uint8_t> data)
     {
         std::string str(hex::sizeEncoded(data), ' ');
         hex::encode(data.data(), data.size(), str.data(), str.size());
@@ -68,22 +69,22 @@ namespace hex
     {
         if (str_size % 2 != 0)
         {
-            throw std::logic_error("hex::decode: isn't hex");
+            throw basen::Exception(basen::Exception::Code::PADDING);
         }
         if (data_size < hex::sizeDecoded(std::string_view(str, str_size)))
         {
-            throw std::length_error("hex::decode: not enough allocated length");
+            throw basen::Exception(basen::Exception::Code::LENGTH);
         }
         if (!hex::isValid(str, str_size))
         {
-            throw std::logic_error("hex::decode: out of digits map");
+            throw basen::Exception(basen::Exception::Code::OUT_OF_ALPH);
         }
         for (size_t i = 0; i * 2 < str_size; i++)
         {
             data[i] = map[(uint8_t)str[i * 2]] << 4 | map[(uint8_t)str[i * 2 + 1]];
         }
     }
-    std::vector<uint8_t> decode(std::string_view str) noexcept
+    std::vector<uint8_t> decode(std::string_view str)
     {
         std::vector<uint8_t> data(hex::sizeDecoded(str));
         hex::decode(str.data(), str.size(), data.data(), data.size());
diff --git a/test/test-hex.cpp b/test/test-hex.cpp
index 30a739c..c277d65 100644
--- a/test/test-hex.cpp
+++ b/test/test-hex.cpp
@@ -1,5 +1,6 @@
 #include <utility>
 
+#include <basen/Exception.hpp>
 #include <basen/hex.hpp>
 #include <gtest/gtest.h>
 
@@ -20,8 +21,8 @@ TEST(hex, encode)
     EXPECT_EQ("74657374", encode(data));
 
     std::string str = "";
-    EXPECT_THROW(encode(data.data(), std::numeric_limits<size_t>::max(), str.data(), str.size()), std::overflow_error);
-    EXPECT_THROW(encode(data.data(), data.size(), str.data(), str.size()), std::length_error);
+    EXPECT_THROW(encode(data.data(), std::numeric_limits<size_t>::max(), str.data(), str.size()), basen::Exception);
+    EXPECT_THROW(encode(data.data(), data.size(), str.data(), str.size()), basen::Exception);
     EXPECT_NO_THROW(encode(data.data(), 0, str.data(), str.size()));
 }
 TEST(hex, encode_1e7)
@@ -34,9 +35,9 @@ TEST(hex, decode)
     std::vector<uint8_t> data = {0x61, 0x6e, 0x6f};
     EXPECT_EQ(decode("616e6f"), data);
 
-    EXPECT_THROW(decode("FFF", 3, data.data(), data.size()), std::logic_error);
-    EXPECT_THROW(decode("!@#!", 4, data.data(), data.size()), std::logic_error);
-    EXPECT_THROW(decode("FF", 2, data.data(), 0), std::length_error);
+    EXPECT_THROW(decode("FFF", 3, data.data(), data.size()), basen::Exception);
+    EXPECT_THROW(decode("!@#!", 4, data.data(), data.size()), basen::Exception);
+    EXPECT_THROW(decode("FF", 2, data.data(), 0), basen::Exception);
     EXPECT_NO_THROW(decode("", 0, data.data(), 0));
 }
 TEST(hex, decode_1e7)