File Extension Extractor Online — Batch Extract Extensions
Extract unique or full lists of file extensions from directories, file manifests, and paths. Great for audit, asset organization, and data migration.
How to use File Extension Extractor
Drop the text, table, or snippet that needs file extension extractor into the input box.
Toggle the checkboxes or fields if the tool offers them, then watch the output update.
Use Copy or Save. Because this runs locally, you can work on private data without an account.
Why use this tool?
The Problem
Sorting through thousands of file paths to identify file types manually is slow and error-prone.
The Solution
Paste a list of filenames or paths and get all unique file extensions isolated in seconds.
Common Use Cases
- Asset directory auditing
- Verify allowed upload formats
- Organize media libraries
How it works
The tool parses each line, detects the terminal period and extension suffix, and outputs a clean, deduplicated list. All calculations and text processing routines execute locally using standard JavaScript inside your browser. No contents are uploaded to any server.
Before / After Example
photo.jpg script.js archive.tar.gz photo2.jpg
jpg js tar.gz
Tips & Best Practices
Enable deduplication to get a clean summary of every unique format in your directory.
Common Mistakes
Dots in folder paths can confuse naive tools; our parser identifies the true file suffix.
Frequently Asked Questions
How do I use File Extension Extractor online?
Paste your input into File Extension Extractor, adjust any options, and copy the result. Extract file extensions from paths list. All processing stays in the tab.
Does File Extension Extractor upload my data?
No. File Extension Extractor runs in your browser with JavaScript. Answer to Geek does not receive the text, CSV, tokens, or files you paste.
How do I extract file extensions from a list?
Paste your list of file names or paths into the tool. It extracts each extension into an organized list instantly.
What should I try after File Extension Extractor?
Related tools on this site include filename cleaner, remove duplicate lines, csv column extractor. Open those when you need a follow-up transform on the same data.