Does content filtering block everything harmful?

No. Filtering catches a large share of explicit or harmful sites, but it cannot see inside encrypted apps, will not cover mobile data away from your home network, and can be bypassed with a VPN. Treat it as one layer alongside conversation, supervision and clear family rules, and review it as your child grows.

Do schools have to filter content?

Yes. Schools in England have a statutory expectation under Keeping Children Safe in Education (KCSIE) to have appropriate filtering and monitoring on their networks and devices, reviewed at least annually against the Department for Education standards. You can ask your child's school how its filtering is set up and how often it is reviewed.

Tech and online

Content filtering

Technology that blocks access to certain types of websites or online content. It can be applied at the network level (on your router) or on individual devices.

Content filtering is technology that blocks access to certain types of websites or material, applied either on your home router (network level) or on individual devices, as one layer of protection.

In plain English

Technology that blocks access to certain types of websites or online content. It can be applied at the network level (on your router) or on individual devices.

Why it matters

Filtering is one layer of protection, useful for younger children and shared devices. It will not catch everything, especially on encrypted apps or via personal mobile data, so it works best alongside conversation, supervision, and clear family rules. Schools have specific filtering and monitoring duties under KCSIE.

Frequently Asked Questions

This is practical educational content to support families. For case-specific concerns about a child's safety, contact the NSPCC helpline on 0808 800 5000 or your local safeguarding team.

Last reviewed: 2026-05-17

← Back to glossary