What matters
Passport Photo — United Kingdom dimensions at a glance
UK passport photos are 35×45mm (413×531px at 300 DPI). Unlike many countries, the UK requires a light grey or cream background rather than pure white.
HMPO is strict about photo compliance. Incorrect background color is one of the most common rejection reasons for UK passport applications.
Rejected photos delay passport processing by weeks. The UK specifically rejects pure white backgrounds, shadows, and colored backgrounds.