Keyboard Layout Switcher & Text Fixer

Typing text in the wrong keyboard layout creates a frustrating sequence of seemingly random characters. This error occurs when the operating system's logical input language does not match the user's mental context or physical keystrokes. For example, attempting to type the Russian greeting Привет while the keyboard is set to English (QWERTY) results in Ghbdtn. Conversely, typing Hello with the Russian layout active produces Руддщ.

This tool solves the problem by remapping the character codes based on the physical position of keys on a standard ISO or ANSI keyboard. It functions as a post-processing utility for text recovery, eliminating the need to delete and retype long strings of data. The utility utilizes a bidirectional mapping algorithm that swaps characters between the Latin alphabet and alternative scripts (Cyrillic, Hebrew, Greek, Arabic) or alternative Latin arrangements (QWERTZ, AZERTY, Dvorak).

Accuracy depends on the precise alignment of scan codes. While alphanumeric characters map 1:1 in most cases, punctuation and special symbols often vary significantly between layouts. This system handles Shift-states and common punctuation variances to ensure the restored text retains its original semantic structure and formatting.

The core logic treats the keyboard as a geometric grid where a physical key press k at coordinates (r, c) produces a character value depending on the active layout function L.

If the user types in Layout A (L_A) intending to type in Layout B (L_B), the correction function C maps the character x produced by L_A back to the key position, then applies L_B:

This bijection assumes standard ANSI/ISO hardware layouts. For example, the scan code 0x10 corresponds to q in QWERTY, й in Russian JCUKEN, and a in French AZERTY.