The photo must be taken in the last month. No glasses unless you have to wear them. No head covering unless it is for religious or medical reasons. Keep a plain expression with your mouth closed.
Read from the official source: Get a passport photo: Digital photos. Last checked 2026-10-10. Rules change between cycles, so compare with your own form.
More forms for United Kingdom: United Kingdom: UK passport (print).
The form asks for at least 600 x 750 pixels.
The file must be between 50 KB and 10240 KB.
The form says: plain light-coloured.
They were read from the official source, Get a passport photo: Digital photos, last checked on 2026-10-10. Rules change, so compare with your own form.