wp-gemini-cleaner is a WordPress content filter plugin that automatically strips zero-width Unicode watermarks, invisible directional characters, and smart-quote artifacts when pasting text from LLMs. It runs on wp_insert_post_data and inside the Gutenberg editor to keep database markup clean.
$ wp plugin activate wp-gemini-cleaner
function wp_gemini_cleaner_sanitize_content( string $content ): string {
// 1. Strip zero-width spaces, joiners, and byte-order marks
$content = preg_replace( '/[\x{200B}-\x{200D}\x{FEFF}\x{2060}]/u', '', $content );
// 2. Unwrap accidental outer ```html ... ``` fences
$content = preg_replace( '/^\s*```(?:html)?\s*(.*?)\s*```\s*$/is', '$1', $content );
return trim( $content );
}
add_filter( 'content_save_pre', 'wp_gemini_cleaner_sanitize_content', 10, 1 );Repository: https://github.com/bhubbard/wp-gemini-cleaner
Live Studio: https://code.brandonhubbard.com/wp-gemini-cleaner/
Portal: https://code.brandonhubbard.com/
Install: wp plugin activate wp-gemini-cleaner
Design System: Brandon Hubbard Swiss Modernist (#0A0A0C / 1px Exposed Structural Grid)