Is anonymous donation truly anonymous?

Not in most regulated countries anymore — donor-conceived people can typically request identifying information about their donor once they reach adulthood, even from a donor who was "anonymous" at the time of donation.

Which is legally safer, a known or anonymous donor?

Neither is inherently safer — the clinic-vs-private conception route matters far more than whether you know the donor personally. A known donor conceived via a licensed clinic can carry the same legal protection as an anonymous clinic donor.

Can a known donor's role change later, even if you agreed otherwise?

It's a real risk worth discussing upfront and putting in writing. In some countries, courts can still recognize a parental-style relationship that develops in practice, regardless of what an agreement said — how involved a donor actually becomes over time can matter as much as the original agreement.

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Guide

Known Donor vs Anonymous Donor: How to Decide

The core trade-off between a known and anonymous donor is connection versus legal simplicity: a known donor lets your child grow up with information — and sometimes a relationship — with their biological parent, but requires careful legal structuring depending on where you live; an anonymous donor is typically simpler legally, but many countries now require donor-identity disclosure once the child reaches adulthood anyway, so "anonymous" today usually means "unknown until adulthood," not permanently unknown.

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Key facts

Most countries with a regulated fertility sector (including the UK and the Netherlands) have banned truly anonymous clinic-based donation — donor-conceived people can typically access identifying information about their donor once they reach adulthood (commonly age 16 or 18, depending on the country), so "anonymous" donor conception today usually just means "unknown until adulthood."
A known donor lets your child grow up with real information, and sometimes an ongoing relationship, with their biological parent from the start — a value many parents consider worth the added legal planning it requires.
The single biggest legal risk factor isn't "known vs anonymous" in the abstract — it's whether conception happens through a licensed clinic or privately/at home. Clinic-based conception (with either donor type) is generally the legally protected route; private conception with a known donor can leave him as a legal parent by default in some countries, regardless of any private agreement. This varies significantly by country — see our country-specific known donor guides.
Many donor registries and clinics now offer ways for donor-conceived half-siblings to find and connect with each other later in life — worth researching regardless of which donor type you choose, since it affects your child's future options either way.

Legal considerations

Legal parenthood rules for donors differ significantly by country, and by whether conception happens at a licensed clinic or privately — always check the specific rules for where you live before assuming either donor type is automatically "safer." See our country guides for the Netherlands and UK.
Where anonymous donation is still permitted, it usually comes with its own limits — such as a cap on how many families one donor's donations can be used for.

Costs

Costs vary by country and clinic, but as a general pattern: a known donor typically donates without a fee (though clinic screening and legal costs still apply), while sperm from a clinic or international sperm bank for anonymous donation typically runs from around $100 up to $1,000+ per vial depending on the bank and whether it's imported. See your country guide for exact local figures.

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