A daily updated filename extension database!

J file extension

The table below provides useful information about the .j file extension. It answers questions such as:

  • What is the .j file?
  • What program do I need to open a .j file?
  • How can the .j file be opened, edited or printed?
  • How can I convert .j files to another format?

Table of Contents

We hope you find this page helpful and a valuable resource!

0 extension(s) and 2 alias(es) found in database

✅ Java Source Code

JAVA file is a Java Source Code. Java source code can be compiled into Java bytecode (CLASS) using javac, the Java compiler.
Application: Java Development Kit
Mime-type: text/plain
Magic number: -
Magic string: -
Sample: -
JAVA aliases:
j, jav
JAVA related links:
JAVA related extensions:
Java Class

Java Archive

JRun Server Application

Java Manifest File

Java Application Descriptor

BlackBerry COD Archive

Java Serialized Object

Digital Signature

Java Web Archive

Velocity Macro File

✅ JPEG Bitmap Image

JPG file is a JPEG Bitmap Image. JPEG is the image format most used for storing and transmitting photographs on the World Wide Web.
Category: Graphic files
Application: -
Mime-type: image/jpeg
Magic number: 0xff, 0xd8, 0xff
Magic string: ÿØÿ
Sample: -
JPG aliases:
cmp, j, jff, jfi, jfif, jif, jpe, jpeg, jtf
JPG related links:
JPG related extensions:
Art Image

AT&T Group 4 Bitmap Image

Windows Bitmap Image

CALS Compressed Bitmap

CorelDraw Drawing

Computer Graphics Metafile

Corel Photo-Paint Image

Windows Custom Cursor

Dr. Halo Bitmap Image

Micrografx Designer Drawing

Other types of files may also use the .j file extension.

🔄 .j converters

The following softwares are capable of converting .j files to other formats:


For example, using the softwares above, a .j file can be converted into one of the following formats:

mif, vpb, avs, cpi, pcp, geo, gif, ppm, ima, lbm, fun, cpa, uni, pri, fac

🔴 Can't open a .j file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .j file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .j file extension, write to us!

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