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Autofill is a built-in feature in most web browsers, designed to automatically complete online form fields with information you've previously saved, such as your name, address or payment details. While this feature greatly facilitates navigation, it also poses risks to the security and privacy of your personal data.

The benefits of autofill

Using autofill allows for considerable time savings. For example, a study conducted by the Chrome team showed that users who enable this feature complete forms about 35% faster and abandon them less often (Source Chrome Autofill Insights 2024: https://developer.chrome.com/blog/autofill-insights-2024?hl=fr).
This time saving is particularly valuable for those who regularly fill out online forms, making the experience smoother and more pleasant.

The risks associated with autofill

Despite its advantages, this feature also has some significant drawbacks:

• Incorrect or outdated information
  If stored data isn't regularly updated, the browser may insert incorrect information into forms.

• Accidental submission of sensitive data
  Autofill can automatically complete fields with private information, which may lead to inadvertent submission if you don't verify the form.

• Unauthorized access to your information
  If someone accesses your device, they could view or use the stored data.

How does autofill work?

Autofill retrieves data stored locally on your device or synchronized through your browser account. Algorithms attempt to identify the type of information to insert in each field, which isn't always perfect, especially if the form has peculiarities. This technology, though convenient, thus depends on the quality of stored data and the browser's ability to interpret it correctly.

Security measures to protect your data

To benefit from the convenience of autofill while protecting your information, here are some simple tips:

1. Disable autofill for sensitive information
   If you're concerned about the security of your personal data (such as payment information), disable this feature in your browser settings. This prevents sensitive data from being automatically inserted without your verification.

   • Firefox documentation: https://support.mozilla.org/en-US/kb/control-form-autofill

   • Chrome documentation:  https://support.google.com/chrome/answer/142893

   • Microsoft Edge documentation: https://support.microsoft.com/en-us/microsoft-edge/automatically-fill-in-info-in-microsoft-edge-81da697c-9910-d9b8-d50a-1712d96f3db8
   • Safari documentation: https://support.apple.com/guide/safari/ibrwa005/mac

2. Enable two-factor authentication (2FA)
   By adding an extra layer of security when logging into your accounts, two-factor authentication reduces the risk of unauthorized access, even if someone obtains some of your information. To learn more, consult the multi-factor authentication guide proposed by CNIL: https://www.cnil.fr/sites/cnil/files/2024-03/projet_de_recommandation_authentification_multifacteur.pdf

3. Use a password manager
   These tools store and manage your passwords securely, providing a more reliable alternative than direct browser storage. Don't hesitate to consult CNIL's latest recommendations on this topic: https://www.cnil.fr/en/passwords

Additional explanations

Autofill relies on text recognition mechanisms that analyze forms and determine what types of information should be inserted in each field. This automation, though convenient, isn't infallible. Sometimes, it can misinterpret the nature of a field or use outdated data. That's why it's always recommended to manually verify information before submitting a form, to ensure it's accurate and up-to-date.

Moreover, while data synchronization between devices is useful, it can also expose your information to additional risks if one of your devices is compromised. It's therefore essential to keep your devices secure and regularly update your stored information.

Conclusion

Autofill offers undeniable convenience by simplifying online form completion and saving you time. However, it's not without risks, particularly regarding data reliability and privacy protection. By disabling this feature for sensitive information, using two-factor authentication, and adopting a password manager, you can enjoy its benefits while strengthening your data security.