The website nederlandwereldwijd.nl offers an online tool that you can use to find out whether you (might) have lost your Dutch citizenship and if so, how you can have checked whether you are disproportionately violated in exercising your rights as an EU-citizen due to the loss of your Dutch nationality.
The tool was developed in response to recent rulings of the European Court of Justice (CJEU) and the Administrative Jurisdiction Division of the Council of State (ABRvS) about the automatic loss of Dutch citizenship. We wrote an article and a blog about these rulings.
Please be cautious when using the tool. Dutch nationality law is complex, has many exceptions and transitional provisions and your Dutch citizenship position can only be determined on the basis of exact data.
In addition, please keep in mind that while general information about the proportionality test and the supporting documents that you can provide is useful, the individual circumstances of the applicant are central to the application of the proportionality test.
If you are unable to provide certain documents, this does not automatically mean that the loss of Dutch citizenship, and therefore EU-citizenship, could not be disproportionate in your case.