File Extension Identifier
Enter a file extension (like .ts, .md, etc.) and get its meaning and usage.
Enter File Extension
Enter the extension without the dot (.) prefix
Popular Extensions
Extension Information
Portable Document Format
Description
Common Uses
Associated Programs
MIME Type
Enter a file extension and click "Identify Extension"
About File Extensions
File extensions are the characters that appear after the last dot in a filename. They help operating systems and applications identify the file type and determine which program should open it.
File Type Identification
Extensions tell your computer what kind of data is in a file and which programs can open it.
Cross-Platform Compatibility
Standard extensions help ensure files can be opened across different operating systems and devices.
Security Considerations
Be cautious with certain extensions like .exe or .bat as they can execute code and potentially contain malware.
Some operating systems may hide file extensions by default. You can usually change this setting in your file explorer preferences to always show file extensions.