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diff --git a/quantum/send_string/send_string.h b/quantum/send_string/send_string.h
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+/* Copyright 2021
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * \defgroup send_string
+ *
+ * Send String API. These functions allow you to create macros by typing out sequences of keystrokes.
+ * \{
+ */
+
+#include <stdint.h>
+
+#include "progmem.h"
+#include "send_string_keycodes.h"
+
+// Look-Up Tables (LUTs) to convert ASCII character to keycode sequence.
+extern const uint8_t ascii_to_shift_lut[16];
+extern const uint8_t ascii_to_altgr_lut[16];
+extern const uint8_t ascii_to_dead_lut[16];
+extern const uint8_t ascii_to_keycode_lut[128];
+
+// clang-format off
+#define KCLUT_ENTRY(a, b, c, d, e, f, g, h) \
+    ( ((a) ? 1 : 0) << 0 \
+    | ((b) ? 1 : 0) << 1 \
+    | ((c) ? 1 : 0) << 2 \
+    | ((d) ? 1 : 0) << 3 \
+    | ((e) ? 1 : 0) << 4 \
+    | ((f) ? 1 : 0) << 5 \
+    | ((g) ? 1 : 0) << 6 \
+    | ((h) ? 1 : 0) << 7 )
+// clang-format on
+
+/**
+ * \brief Type out a string of ASCII characters.
+ *
+ * This function simply calls `send_string_with_delay(string, 0)`.
+ *
+ * Most keycodes from the basic keycode range are also supported by way of a special sequence - see `send_string_keycodes.h`.
+ *
+ * \param string The string to type out.
+ */
+void send_string(const char *string);
+
+/**
+ * \brief Type out a string of ASCII characters, with a delay between each character.
+ *
+ * \param string The string to type out.
+ * \param interval The amount of time, in milliseconds, to wait before typing the next character.
+ */
+void send_string_with_delay(const char *string, uint8_t interval);
+
+/**
+ * \brief Type out an ASCII character.
+ *
+ * \param ascii_code The character to type.
+ */
+void send_char(char ascii_code);
+
+/**
+ * \brief Type out an eight digit (unsigned 32-bit) hexadecimal value.
+ *
+ * The format is `[0-9a-f]{8}`, eg. `00000000` through `ffffffff`.
+ *
+ * \param number The value to type, from 0 to 4,294,967,295.
+ */
+void send_dword(uint32_t number);
+
+/**
+ * \brief Type out a four digit (unsigned 16-bit) hexadecimal value.
+ *
+ * The format is `[0-9a-f]{4}`, eg. `0000` through `ffff`.
+ *
+ * \param number The value to type, from 0 to 65,535.
+ */
+void send_word(uint16_t number);
+
+/**
+ * \brief Type out a two digit (8-bit) hexadecimal value.
+ *
+ * The format is `[0-9a-f]{2}`, eg. `00` through `ff`.
+ *
+ * \param number The value to type, from 0 to 255.
+ */
+void send_byte(uint8_t number);
+
+/**
+ * \brief Type out a single hexadecimal digit.
+ *
+ * The format is `[0-9a-f]{1}`, eg. `0` through `f`.
+ *
+ * \param number The value to type, from 0 to 15.
+ */
+void send_nibble(uint8_t number);
+
+/**
+ * \brief Type a pseudorandom character from the set `A-Z`, `a-z`, `0-9`, `+` and `/`.
+ */
+void tap_random_base64(void);
+
+#if defined(__AVR__) || defined(__DOXYGEN__)
+/**
+ * \brief Type out a PROGMEM string of ASCII characters.
+ *
+ * On ARM devices, this function is simply an alias for send_string_with_delay(string, 0).
+ *
+ * \param string The string to type out.
+ */
+void send_string_P(const char *string);
+
+/**
+ * \brief Type out a PROGMEM string of ASCII characters, with a delay between each character.
+ *
+ * On ARM devices, this function is simply an alias for send_string_with_delay(string, interval).
+ *
+ * \param string The string to type out.
+ * \param interval The amount of time, in milliseconds, to wait before typing the next character.
+ */
+void send_string_with_delay_P(const char *string, uint8_t interval);
+#else
+#    define send_string_P(string) send_string_with_delay(string, 0)
+#    define send_string_with_delay_P(string, interval) send_string_with_delay(string, interval)
+#endif
+
+/**
+ * \brief Shortcut macro for send_string_with_delay_P(PSTR(string), 0).
+ *
+ * On ARM devices, this define evaluates to send_string_with_delay(string, 0).
+ */
+#define SEND_STRING(string) send_string_with_delay_P(PSTR(string), 0)
+
+/**
+ * \brief Shortcut macro for send_string_with_delay_P(PSTR(string), interval).
+ *
+ * On ARM devices, this define evaluates to send_string_with_delay(string, interval).
+ */
+#define SEND_STRING_DELAY(string, interval) send_string_with_delay_P(PSTR(string), interval)
+
+/** \} */