Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.DIFF
File Type
Patch File
Category
Programming
Best first step
Use compatible software
Quick Summary
A practical overview of the .diff file format
A DIFF file, also known as a patch file, is a plain text document that describes the differences between two versions of a file, typically source code. These files are generated by the 'diff' utility and are used extensively in software development to track changes, share updates, and apply fixes.…
File extension
.DIFF
File type
Patch File
Category
Programming
Recommended action
Open with a trusted compatible app
How to open a .diff file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .diff.
- Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
- Update the application if the file was created by a newer version of the software.
- Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.
What is a .diff file?
File extension details and usage information
A DIFF file, also known as a patch file, is a plain text document that describes the differences between two versions of a file, typically source code. These files are generated by the 'diff' utility and are used extensively in software development to track changes, share updates, and apply fixes. The format typically follows a standardized syntax, such as the 'unified format,' which includes metadata about the files being compared and specific 'hunks' that show exactly which lines were added, removed, or modified. Because they only contain the changes rather than the entire file, DIFF files are highly efficient for version control systems like Git, SVN, and Mercurial. Developers use these files to perform code reviews, as they provide a clear, human-readable summary of modifications. They can be applied to an original source file using the 'patch' command-line tool to automatically update the code to the newer version. While they are primarily used for programming, any text-based data can be compared and stored in this format.
Software Compatibility
Programs that may open or work with .diff files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .diff files be converted?
Options for saving or exporting this file to another format
In many cases, a .diff file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.
- Use the original software that created the file when possible.
- Check whether the application supports exporting to common formats.
- Be careful with online converters when working with private, business, or sensitive files.
- If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .diff file.
Why can't I open a .diff file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .diff format.
Incorrect extension
The file extension may have been renamed manually, even though the actual file format is different.
Corrupted file
The file may be incomplete, damaged during download, or transferred incorrectly.
Outdated app
Your software may need to be updated before it can open newer versions of this file format.
Frequently Asked Questions
Common questions about .diff files
To open a .diff file, use software that supports this file format.
- Notepad++
- Visual Studio Code
- WinMerge
- Git for Windows
- Sublime Text
Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.
- Verify that the file extension is correct.
- Install or update compatible software.
- Try another application that supports this format.
- Check whether the file is corrupted, incomplete, or encrypted.
A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.
File safety tips
Use caution with unknown files
Only open files from trusted sources. Before opening a .diff file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.