Ext Decoder

Problem it solves

Unfamiliar file extensions and dotfiles are confusing, and a file's extension says little about whether its contents are safe.

Features

• Instant lookup for 150+ extensions, dotfiles and extensionless filenames
• "Did you mean" suggestions for unknown extensions
• Handles ambiguous (.ts, .key, .pkg) and compound (.tar.gz) extensions
• Explains editability, conversion options and associated software
• Separates format info from safety guidance
• 100% client-side with zero external calls

How it works

The filename is parsed into a canonical type, then looked up against curated datasets: ambiguous entries first, then the main dataset, then a fuzzy fallback for suggestions. All logic is synchronous and runs in the browser.