How to remove Diagram.app (Mac)

What is Diagram.app

Diagram.app is an adware application primarily targeting macOS users. It is known for generating intrusive advertisements that mislead users into clicking on dubious links and offers. Once installed, this adware can significantly slow down system performance and redirect users to unreliable websites, posing potential security threats. Diagram.app is part of the Pirrit family of adware, which is notorious for its deceptive practices and data collection capabilities. Users may unknowingly install this application through bundled software downloads or by interacting with misleading advertisements online. To protect against such threats, it is essential to ensure that software is downloaded only from trusted sources and to be vigilant during installation processes. Removing Diagram.app promptly is crucial to maintain a secure and efficient computing environment.

How Diagram.app infects Mac computers

Diagram.app typically infects Mac computers through deceptive software bundling, where users unknowingly install it while downloading free or untrustworthy applications. This adware often hides within the installation prompts of legitimate software, making it easy to overlook. Users may inadvertently agree to install Diagram.app by selecting default installation options without carefully examining the advanced or custom settings. Additionally, it can be spread through malicious links, compromised websites, or by downloading files from peer-to-peer networks and unofficial platforms. Once installed, Diagram.app generates intrusive ads and redirects users to potentially harmful sites, further compromising their privacy and security. To avoid such infections, users should always download software from reputable sources and remain vigilant during the installation process.

1. Download Diagram.app Removal Tool
2. Remove Diagram.app from Login Items
3. Remove/Uninstall Diagram.app from Applications
4. Remove Diagram.app from browsers
5. Reset browser settings
6. Remove Diagram.app files and folders
7. Block Diagram.app ads and pop-ups
8. How to protect from threats, like Diagram.app

Remove Diagram.app manually for free

Note: Diagram.app sets up to start on macOS startup. Therefore, before starting the removal, perform these steps:

1. Open System Preferences, choose Users & Groups.
2. Choose your account (set up as Current User).
3. Click Login Items tab.
4. Find “Diagram.app” entry. Select it, and click the “-“ (minus) button to remove it.

Note 2: Diagram.app won’t quit just by closing it, therefor use Force Quit to end the process.

1. Press 3 buttons at the same time: Option, Command, and Esc (Escape). This is similar to Control-Alt-Delete on a Windows PC.
2. Choose Diagram.app in the list.
3. Click Force Quit button.

Here is a manual step-by-step tutorial for full Diagram.app removal from your computer. This works 99% and was checked with the latest versions of Diagram.app installer on operating systems with the latest updates and browser versions.

Remove Diagram.app from Applications

Remove Diagram.app from Mac:

1. In the Finder sidebar, click Applications.
2. Diagram.app might have an Uninstaller. If you see Uninstall Diagram.app or Diagram.app Uninstaller, double-click it and follow the onscreen instructions.
3. Otherwise, drag Diagram.app from the Applications folder to the Trash (located at the end of the Dock).
4. Then choose Finder > Empty Trash.

Cannot uninstall Diagram.app

If you can’t uninstall Diagram.app using instructions above, or it keeps coming back, you can use free AppCleaner for Mac to remove all residual data and libraries of Diagram.app. Follow instructions below:

1. Download free AppCleaner.
2. Drag Diagram.app from Applications folder to AppCleaner window.
3. Choose files and folders you want to remove along with Diagram.app.
4. Click Delete button.

Remove Diagram.app add-on from your browsers

Removing Diagram.app from Applications often does not bring the desired effect. It is a browser extension, and it may still be active in Google Chrome and Mozilla Firefox. Here are instructions on how to remove the Diagram.app extension from your browsers manually.

Safari:

1. Start Safari on your Mac, click Safari to open drop-down menu and choose Preferences
2. Click Extensions tab.
3. Find Diagram.app extension.
4. Click Uninstall button to remove it.

Google Chrome:

1. Start Google Chrome browser
2. In address box type (or copy-paste) chrome://extensions.
3. Find Diagram.app extension.
4. Click the trash can icon to remove it.

Mozilla Firefox:

1. Start Mozilla Firefox browser.
2. In address box type (or copy-paste) about:addons.
3. Choose Diagram.app extension.
4. Click Disable or Remove button.

Reset browser settings

To finish Diagram.app removal, reset your browser settings to make sure, there are no leftover items in browser folders.

Reset Safari:

1. Start Safari on your Mac, click Safari to open drop-down menu and choose Preferences
2. Go to the Privacy section of Safari’s preferences.
3. Click Remove All Website Data button.
4. In the opened window, click Remove Now button to remove data stored by websites in Safari.
5. Go to the Advanced section of Safari’s preferences.
6. Click the Show Develop menu in menu bar option.
7. In the menu, click Develop and select Empty Caches from this menu.
8. Again, go to Safari menu and choose Clear History….
9. Choose to clear all history and click Clear History button.

Reset Google Chrome:

1. Start Google Chrome browser
2. In address box type (or copy-paste) chrome://settings.
3. Scroll down and find Show advanced settings link.
4. Click on it and scroll down to the bottom again.
5. Click Reset settings button and click Reset to confirm.

Reset Mozilla Firefox:

1. Start Mozilla Firefox browser.
2. In address box type (or copy-paste) about:support.
3. Click Refresh Firefox… button.
4. Click Refresh Firefox to confirm.

Remove following files and folders of Diagram.app


~/Library/Application Support/.[random_string]/Services/com.Diagram.app.service.app
~/Library/LaunchAgents/com.Diagram.app.service.plist
/Library/Application Support/.[random_string]/System/com.Diagram.app.system
/Library/LaunchDaemons/com.Diagram.app.system.plist


Download AdGuard for Mac to block malicious pop-ups, that promote Diagram.app

AdGuard is the best ad-blocker, internet filtering, and internet security application for macOS. It can cut out unwanted banners from site pages, block pop-ups, stop redirects, and prevent users from visiting potentially dangerous resources. Use it to stop ads promoting Diagram.app in browsers.

Download AdGuard for Mac

How to protect Mac OSX from adware, like Diagram.app

Mac OSX is known to be one of the safest operating systems, and for a long time, there was no need for antivirus products for Mac. But with the growing popularity of Mac computers and notebooks and evolving technology, viruses, trojans, adware, toolbars, hijackers, and other malware paved the way for Mac users. We recommend you to use one of the best anti-malware for Mac available — Malwarebytes for Mac.

Download Malwarebytes for Mac