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AppImage is a popular packaging format for Linux systems. You'll often find applications packaged in this format.
Sometimes, when you try to log in to a service’s AppImage through a browser, even though it will report a success and tell you to go back to the app, it actually won’t.
Let me share a quick tip on how to force open external links in AppImage so that you can log into it through a browser.
Make AppImage open external links
Here, I am using an AppImage for Todoist that needs you to log in through the browser.
First, open the app and click on login through the browser button.
![Click on Login via browser on the AppImage](https://itsfoss.com/content/images/2023/10/1-click-on-login-via-browser.png)
When it asks you to login, enter the credentials and log in.
![When asked, login through Web Browser using the credentials](https://itsfoss.com/content/images/2023/10/2-click-on-login-button.png)
Once you successfully log in, it will ask you to open the app in an external app.
![Use "Choose a different Application" link in Firefox to select a different application for the link.](https://itsfoss.com/content/images/2023/10/3-click-on-chose-different-application.png)
If your System Handler finds the proper app, then there is no issue. If you want to open it in another app of your choice, click on “Choose a different application” link.
Now, click on “Choose” button.
![Click on Choose button to open a file selector](https://itsfoss.com/content/images/2023/10/4-click-on-chose-to-open-file-browser-1.png)
This will bring you to the file chooser. Select the AppImage of your choice, in this case, Todoist, to open that particular link.
![Locate the AppImage file, of the application that you want to open the link in.](https://itsfoss.com/content/images/2023/10/5-select-appimage.png)
Click on Select. Once selected, press “Open Link” to open it in the AppImage.
![After selecting the AppImage file, Click on Open Link button to open the specified link in the specified AppImage](https://itsfoss.com/content/images/2023/10/6-open-link-1.png)
That's it. You can see the AppImage will be now logged in.
Please note that this is a very specific scenario and you'll encounter it with very few applications.
I hope this quick tip helps you. Please let me know if you have questions or suggestions in the comments.