Consent-O-Matic

Most websites today want to process your data and ask for consent using cookie banners. While these banners are meant to give you control, in practice they often result in repetitive and time-consuming clicks—especially if your browser clears cookies when you close it. The same banner reappears, and you find yourself making the same choices again and again.

Consent-O-Matic is a browser extension designed to solve this problem. Developed by the Centre for Advanced Visualization and Interaction (CAVI) at Aarhus University, the tool automatically handles consent banners on your behalf. After you set your preferences during installation, Consent-O-Matic will recognize many common Consent Management Platform (CMP) banners, apply your choices, and confirm with a little checkmark next to the extension icon.

Because Consent-O-Matic is an open-source project, anyone can contribute to its improvement by adding new rules, updating old rules, or updating documentation. This collaborative approach ensures that the extension keeps pace with the constantly changing landscape of online consent banners—and makes it easier for everyone to safeguard their data with less hassle.

Further reading

Academic Papers

• Nouwens, M., Liccardi, I., Veale, M., Karger, D., & Kagal, L. (2020, April). Dark patterns after the GDPR: Scraping consent pop-ups and demonstrating their influence. In Proceedings of the 2020 CHI conference on human factors in computing systems. Open source PDF
• Nouwens, M., Bagge, R., Kristensen, J. B., & Klokmose, C. N. (2022, April). Consent-o-Matic: Automatically answering consent pop-ups using adversarial interoperability. In CHI Conference on Human Factors in Computing Systems Extended Abstracts Open source PDF
• Nouwens, M., Kristensen, J. B., Maalt, K., & Bagge, R. (2025, April). A Cross-Country Analysis of GDPR Cookie Banners and Flexible Methods For Scraping Them. In Proceedings of the 2025 CHI Conference on Human Factors in Computing Systems

Other mentions

• Recommended by the Dutch Data Protection Authority: Privacy risks and protecting your privacy when accepting cookies
• Recommended by Mozilla: Top anti-tracking extensions
• Open-Source ‘Consent-O-Matic’ Tool Lets Anyone Automatically Stop Websites From Tracking Them (Vice, September 2022)
• How to stop annoying cookie pop-ups from ruining your browsing (TheNextWeb, May 2022)
• How to Avoid Those Infuriating Cookie Pop-Ups (Wired, 2021)
• Virksomheder narrer brugerne til mere dataovervågning (PROSA, March 2020, in Danish)^{[Internet Archive]}
• Accepterer du cookies? Her er fire metoder til at undgå overvågning på nettet (DR, January 2020, in Danish)

Compatible CMPs

Consent-O-Matic currently works with more than 200 CMPs (see full list here), including major platforms like UserCentrics, CookieBot, OneTrust, as well as cookie banners for specific websites.

Privacy

Consent-O-Matic uses the following set of permissions in the browser when installed:

• Access to read all pages - It searches each page you visit for consent-related popups that it knows how to handle
• Information about tab URLs - You can turn the extension on/off on a page-by-page basis by clicking the icon. To check if it is enabled it needs to know the address of the page you are visiting
• Storage - Your preferences and settings are stored directly in your browser

The extension only communicates with the web in two situations:

• When fetching and updating rule lists
• When you report a website as not working through the extension icon menu (the Let us know! button)

The URL of the website reported through the extension icon is sent to a website hosted by Aarhus University in the form of a URI-encoded query string (e.g., LinkedIn will be reported as https://gdprconsent.projects.cavi.au.dk/report.php?url=www.linkedin.com).

Installation

We highly recommend installing directly through the official extension store of your browser (mentioned at the top). Installing through the official channels will automatically keep you up-to-date with new versions when they are released.

It is also possible to get the extension by other means.

Installing from Archived Release

As an alternative to extension stores you can manually download and extract one of the published versions from the Releases page on Github.