Find out the file type by file data or name. Get extension from filename. Confirm filename extension by file signature. Check file format.

A go library to intuitively manipulate file names.

A tiny yet powerfull collection of utils for processing filenames compareable to Apaches FilenameUtils for Java

A dictionary of programming languages and their associated filename extensions.

Check file name with RegEx

File Extension Fix Tool - Find and rename files with wrong extensions.