OPML File Extension
Outline Processor Markup Language Format
- File Type opml
- Developer The Omni Group
- Popularity
- Application Atom
- Category Text Files, Web Files
- Format XML
What is a OPML file?
The OPML extension is used by Outline Processor Markup Language Format and falls under the categories of Text Files and Web Files, covering 598 files.
The Omni Group, the developer of the Outline Processor Markup Language Format (OPML), has released file format and 3 programs designed to handle them.
OPML files are supported by Windows, Mac OS and Linux. There are 15 programs available to open a OPML file, including popular tools like Windows Notepad, Sublime Text and Atom.
MIME types
- application/xml
- text/xml
- text/x-opml
Programs that support OPML files
How to open a OPML file?
If you are having trouble opening a OPML 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 OPML files are Windows Notepad, Sublime Text and Atom. To install the current version of Atom, go directly to the official website. The universal package for all operating systems is available there.
After setup, the operating system should recognize OPML files and link them with Atom.
Setting Atom as default OPML viewer
Changing the default program in Windows
- Right-click on your OPML file and choose the "Open With" option. Then click "Choose another app" to continue the process;
- Choose Atom from the available applications listed in the pop-up window to set it as the default application to open your OPML 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 OPML 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 Atom. Check the box next to "Always open in app" to set it as the default program.
How to edit a OPML file?
To edit OPML files, you need to install specialized software that allows you not only to open but also to modify text files. Online OPML editors usually provide fewer features than software created specifically for Outline Processor Markup Language Format.
Best OPML editors in 2026
Based on your described criteria, here is a list of available OPML editors.
| OPML Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| TextEdit | Apple | Mac OS | 4.8 out of 5 (40 reviews) |
| Windows Notepad | Microsoft | Windows | 4.8 out of 5 (35 reviews) |
| PSPad | Jan Fiala | Windows | 4.7 out of 5 (41 review) |
| Gedit | GNOME | Linux | 4.6 out of 5 (38 reviews) |
| Notepad++ | Notepad++ Team | Windows | 4.6 out of 5 (37 reviews) |
| Sublime Text | Sublime HQ Pty | Windows, Mac OS, Linux | 4.6 out of 5 (39 reviews) |
| Tkoutline | SourceForge | Windows | 4.2 out of 5 (41 review) |
| Atom | - | Windows, Mac OS, Linux | 4.1 out of 5 (36 reviews) |
Tips and tricks to solve problems with OPML files
OPML 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 OPML file is damaged?
Corrupted OPML text files may have one or more of the following symptoms:
- File hangs or crashes in Atom or other programs;
- Error dialogs are displayed when interacting with the file;
- The file does not open or opens with errors;
- Unexplained increase in OPML file size;
- Poor performance when editing a file in Gedit;
Why does Atom crash or shut down frequently?
The absence of software updates can cause Atom to crash. It is recommended to install the latest available updates for developer 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 OPML file?
Start a data recovery program and open the damaged OPML 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 text files.