Convert text to Toggle Case

This tool converts your text to toggle case, where every alphabetic character is replaced with its opposite case (uppercase becomes lowercase and vice versa). It provides flexible options so you can: • Toggle every letter in the text. • Toggle only specified letters. • Toggle all letters except those explicitly allowed. • Toggle letters and display each using a custom format. Simply enter your text and select the processing mode that suits your needs.

Input

Output

Processing Modes:

Toggle All Letters
Converts every alphabetic character in the text to its opposite case.

Toggle Only Specified Letters
Only toggles the letters you specify (enter a comma‑separated list, e.g., a, e, t).

Toggle All Except Allowed Letters
Toggles every letter except those you explicitly allow (enter a comma‑separated list, e.g., l, o).

Toggle Letters with Custom Format
Toggles each letter and replaces it with your custom formatted string. Use {letter} as a placeholder for the toggled letter.

Examples:

Toggle All Letters

Every letter is toggled: uppercase becomes lowercase and vice versa.

Before:

Hello World!

After:

hELLO wORLD!

Toggle Only Specified Letters

Only toggles letters that match the specified list. For example, if you specify "a, e", only the letters 'a' and 'e' are toggled.

Before:

Apple Banana

After (specifying "a, e"):

aPplE Banana

Toggle All Except Allowed Letters

Toggles every letter except those allowed. For instance, if you allow "l, o", those letters remain unchanged.

Before:

Hello World!

After (excluding "l, o"):

HeLLo WoRLD!

Toggle Letters with Custom Format

Each toggled letter is replaced using your custom format. For example, using "[{letter}]" wraps each toggled letter in square brackets.

Before:

Hello World!

After (format "[{letter}]"):

[h][E][L][L][O] [w][O][R][L][D]!