File Extension Lookup

Tools.file-extension-lookup.extension
Tools.file-extension-lookup.type
Tools.file-extension-lookup.description
.jpg
Image
JPEG image file
.png
Image
PNG image file
.gif
Image
GIF image file
.pdf
Document
PDF document
.doc
Document
Microsoft Word document
.docx
Document
Microsoft Word document (XML)
.xls
Document
Microsoft Excel spreadsheet
.xlsx
Document
Microsoft Excel spreadsheet (XML)
.ppt
Document
Microsoft PowerPoint presentation
.pptx
Document
Microsoft PowerPoint presentation (XML)
.txt
Text
Plain text file
.csv
Data
Comma-separated values file
.json
Data
JSON data file
.xml
Data
XML data file
.html
Web
HTML web page
.css
Web
CSS stylesheet
.js
Code
JavaScript file
.ts
Code
TypeScript file
.py
Code
Python script
.java
Code
Java source file
.cpp
Code
C++ source file
.c
Code
C source file
.h
Code
C/C++ header file
.php
Code
PHP script
.rb
Code
Ruby script
.go
Code
Go source file
.rs
Code
Rust source file
.swift
Code
Swift source file
.kt
Code
Kotlin source file
.mp3
Audio
MP3 audio file
.wav
Audio
WAV audio file
.flac
Audio
FLAC lossless audio
.mp4
Video
MP4 video file
.avi
Video
AVI video file
.mov
Video
QuickTime video
.mkv
Video
Matroska video
.zip
Archive
ZIP archive
.rar
Archive
RAR archive
.7z
Archive
7-Zip archive
.tar
Archive
TAR archive
.gz
Archive
GZIP compressed file
.exe
Executable
Windows executable
.dmg
Executable
macOS disk image
.apk
Executable
Android package
.iso
Disk
Disk image file
.ttf
Font
TrueType font
.otf
Font
OpenType font
.woff
Font
Web Open Font Format
.woff2
Font
Web Open Font Format 2
Tools.file-extension-lookup.total_count

What is File Extension Lookup?

Convert between CSV, JSON, YAML, and other data formats. Shuffle lists, deduplicate entries, and reshape your data without writing a single line of code. It all runs in your browser, so sensitive datasets never leave your machine. Paste, convert, copy — done.

▶Use Cases5 scenarios
  • ◆Switching between CSV, JSON, and other formats
  • ◆Sorting lists and removing duplicates
  • ◆Quick stats on your datasets
  • ◆Processing bulk data without scripts
  • ◆Cleaning messy data before importing it
▶How to Use6 steps
  1. 1Open the File Extension Lookup — no signup, no login.
  2. 2Paste your input or drag and drop a file.
  3. 3Hit Process or Generate and see results instantly.
  4. 4Preview the output and click Copy to grab it.
  5. 5💡 Pro Tip: Check the FAQ below for power-user tricks.
  6. 6📌 Bookmark this page — you will want to come back.
▶Features8 features
  • ✓Completely free
  • ✓No account needed
  • ✓Runs in your browser
  • ✓Many formats supported
  • ✓Instant processing
  • ✓Copy with one click
  • ✓Your data stays private
  • ✓Works on any device
▶FAQ7 questions
What is File Extension Lookup?

An online data processing tool. Input: the raw data or content you need to process. Output: the processed result with one-click copy and download. Used for quick processing tasks in development, work, and study. Everything runs locally in your browser — no data is uploaded.

What formats can I convert between?

CSV, JSON, XML, YAML, TOML, and more. If it is a structured data format, we probably support it.

How large a file can I use?

Up to about 10 MB runs smoothly. Bigger files might work but could slow things down a bit.

Does my data go to a server?

Never. Everything stays in your browser.

How fast is it?

Instant for typical files. Large datasets take a couple seconds at most.

Will I lose data during conversion?

Not between compatible formats. If something cannot map cleanly, we will let you know.

Can I use this on my phone?

Sure. Paste data, import files — works fine on mobile too.