Extension Renamer generally refers to software utilities or browser add-ons designed to batch-modify file extensions (the suffix at the end of a filename, like .txt or .jpg), rather than manually changing them one by one.
Because multiple tools use this exact or similar phrasing, the exact software you are referring to depends on your platform: 1. Browser Extensions (e.g., Firefox & Chrome)
If you are looking at web extensions, these tools alter file properties during internet downloads or uploads:
File Extension Renamer for Firefox: A niche tool that intercepts file uploads and automatically changes specific format suffixes to .txt. This is heavily utilized by developers feeding code files (like .tsx or .astro) into AI models or websites that only accept standard text formats.
AutoRename for Chrome: Automatically cleans up and standardizes the names and extensions of web images upon saving. 2. Standalone Desktop Software
If you mean a desktop app to fix bulk files on your hard drive, several highly rated utilities handle this: Advanced Renamer
User Guide – How to correct file extension – Advanced Renamer
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