📂 File Identifier
File Extension Finder
Identify any file extension instantly. Full name, MIME type, compatible software from 200+ extensions database.
All Types
Video
Audio
Image
Document
Archive
Program
Disk Image
Android
📂
Enter a File Extension
Try .mp4, .docx, .iso, .apk or browse below
.mp4
.mkv
.mp3
.docx
.xlsx
.pdf
.iso
.apk
.exe
.zip
.rar
.png
.jpg
.psd
.7z
.webp
.bat
.flac
.torrent
📚 Browse Extensions
What Is a File Extension?
A file extension is the suffix after the period in a filename (e.g., ".pdf" in "document.pdf"). It tells Windows which app to use for opening the file.
How to Show Extensions in Windows
- File Explorer → View → Show → File name extensions (Windows 11)
- Or: Folder Options → View → Uncheck "Hide extensions for known file types"
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Warning: Changing extension does NOT convert the file. Beware of double extensions like "file.pdf.exe" — often malware.