wp-filename-by-md5

This plugin replaces uploaded file names with an MD5 hash computed from the file's content, not the original filename. It is designed for WordPress site owners who want to avoid storing duplicate copies of identical files. Unlike other rename-on-upload plugins that hash the filename only, this tool hashes the actual data, so the same image or document always gets the same name regardless of what it was called originally.

• Content-based hashing – Computes the MD5 hash of the file's binary content, not the filename, ensuring consistent naming across uploads.
• Duplicate prevention – When a file with identical content is uploaded again, it receives the same hash-based name, preventing redundant copies on the server.
• Lightweight and focused – The plugin does one thing: rename uploads by content hash. It has minimal overhead and no unnecessary dependencies.
• Open source – The code is publicly available on GitHub for audit, modification, and contribution under a permissive license.