Hash Permalink is a lightweight, high-performance WordPress plugin that automatically replaces default post slugs with random hash-based short URLs when new content is published.
https://yoursite.com/a7k2m9x4b1n3 (lowercase alphanumeric, 12 chars)https://yoursite.com/6031e781c304 (hexadecimal, 12 chars)https://yoursite.com/post-a7k2m9x4 (with “post” prefix, 8 chars)https://yoursite.com/839201748362 (numeric, 12 chars)