All about JOU Files

The JOU file type is primarily associated with Vivado.

JOU	File extension: JOU
	File type:	log file

What is a JOU file

JOU files mostly belong to Vivado. The JOU file is a journal file that records commands and operations during a software session.
For example, in Xilinx tools like Vivado, a JOU file logs design activities, system responses, and errors so that sessions can be replayed to automate workflows.
Similarly, ANSYS Fluent uses JOU files to capture simulation commands for computational fluid dynamics tasks. Other applications such as those in CAD environments (like Solid Edge) also use these files to save session data.
You can open a JOU file in a text editor to view its plain text commands.
Key points compiled by FilExt.com include:

Recording of system commands

Support for session automation

Generally stored as plain text

Used in design and simulation applications

FilExt.com note: For more details on Xilinx journal files, visit this page.

How to open JOU files

You need a suitable software like Vivado to open a JOU file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your JOU file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a JOU file directly in the browser:. Just drag the file onto this browser window and drop it.

Online JOU Text Viewer

Choose your .jou file to view

or drag and drop it here

Online File Viewer

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How to extract texts from JOU files or capture a screenshot to PDF, JPG, DOCX, TXT, ...

1. Just click the "Choose your .jou file to view" button on this page.
2. Your JOU file will then be displayed in the browser.
3. Now click on "Save as..." at the top of the page.
4. Then choose the file format (e.g. JPG, PDF, DOCX, TXT, ...) you want.
5. Download the converted file.

JOU file format:

To view or edit JOU files you need to know the file format, because it determines how the data in this file is stored. Each file format has a unique extension and almost always a unique signature. For example, Microsoft Word documents have the extension .docx and the signature (usually the first 3 characters in this file) PK. Nonetheless, different programs can utilize the same file extension to represent distinct file formats. Double-clicking on the file often results in an error when opening. When there is a problem with a file, the first step to solving it is to determine the file format. Our evaluation of the JOU files is as follows:

JOU is rarely used as a file extension and has no uniform or dominant file format. But the following two file formats are common:

• 20% of all JOU files start with the magic bytes ;Journal file automatically created by F, which are always the first bytes of this file format. These files are plain text, which means they can be viewed with any text editor such as Windows Editor, Nano for Linux, and TextEdit for macOS. The file size is in the range of 110 bytes to 160 bytes. The keywords Journal file automatically created by Fluent, /file read-case and Users are typical for these files. The following filename is common: _read_fluent_case_.jou or _read_fluent_case_0.jou. These files are attributed to fluent, case and read.
• 10% of all JOU files are based on the well-known config file format. A configuration file is used by computer software to store settings. It consists of a text-based content with a structure and syntax comprising key–value pairs for properties, and sections that organize the properties. These files contain text and words, not binary data. JOU files are between 480 bytes and 1 KB in size. The following keywords are characteristic: #-----------, Build, 64-bit, # Start of and Vivado. vivado.jou is a typical file name. Files like these are sometimes connected to backup.

The remaining 70% of all JOU files are different files with different signatures, often, for example, LPKSHHRH. The category is journal. Just click the "Choose your .jou file to view" button on this page to find out what your JOU file is.