SIG File Extension
Signature Format
- File Type sig
- Popularity
- Application Microsoft OneNote
- Category Data Files
- Format Text
What is a SIG file?
The SIG file extension is linked to Signature Format and belongs to the Data Files category, which includes 6196 files.
SIG files are supported by Windows, Mac OS and Linux. There are 3 programs available to open a SIG file, including popular tools like Microsoft OneNote, Microsoft 365 and Microsoft Office.
Programs that support SIG files
How to open a SIG file?
If you are having trouble opening a SIG file, it usually means the right software is not installed. Choose a program from the list that matches your operating system. Next, visit the official website of the developer, download the software, and install it on your device.
The most popular programs for working with SIG files are Microsoft OneNote, Microsoft 365 and Microsoft Office. To install the current version of Microsoft OneNote, go directly to the official Microsoft website. The universal package for all operating systems is available there.
After setup, the operating system should recognize SIG files and link them with Microsoft OneNote.
Setting Microsoft OneNote as default SIG viewer
Changing the default program in Windows
- Right-click on your SIG file and choose the "Open With" option. Then click "Choose another app" to continue the process;
- Choose Microsoft OneNote from the available applications listed in the pop-up window to set it as the default application to open your SIG file;
- Be sure to check the "Always use this app" checkbox, and then click "OK" to confirm your selection.
Change the default app for a file type in Mac
- Initiate a right click or use Control + left click on the desired SIG file to open a menu where you can select various actions;
- Select "Open in application" and click "Other";
- Scroll down to the bottom of the window, and there you will find the "Enable" menu. The default selection is "Recommended Programs";
- Choose "All Programs" within this menu and locate Microsoft OneNote. Check the box next to "Always open in app" to set it as the default program.
How to edit a SIG file?
To edit SIG files, you need to install specialized software that allows you not only to open but also to modify data files. Online SIG editors usually provide fewer features than software created specifically for Signature Format.
Best SIG editors in 2026
Based on your described criteria, here is a list of available SIG editors.
| SIG Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| Microsoft OneNote | Microsoft | Windows, Mac OS | 4.8 out of 5 (44 reviews) |
Tips and tricks to solve problems with SIG files
SIG files can sometimes be tricky, but minor software adjustments usually resolve the issues. Refer to the tips below for guidance.
Are there any symptoms that my SIG file is damaged?
Corrupted SIG data files may have one or more of the following symptoms:
- File hangs or crashes in Microsoft OneNote or other programs;
- Error dialogs are displayed when interacting with the file;
- The file does not open or opens with errors;
- Unexplained increase in SIG file size;
- Poor performance when editing a file in Microsoft OneNote;
Why does Microsoft OneNote crash or shut down frequently?
The absence of software updates can cause Microsoft OneNote to crash. It is recommended to install the latest available updates for Microsoft products.
Restarting your computer is an essential troubleshooting step that can resolve many common problems. It is recommended to restart your computer before making any changes to the software settings.
Is there any specific software or utility that can help repair a damaged SIG file?
Start a data recovery program and open the damaged SIG file. Go to the menu and select the "Repair" option to repair the file. Then wait for the recovery process to complete, which allows you to automatically repair corrupted data files.