UK passport photo size (35×45 mm)

His Majesty's Passport Office publishes clear rules for what counts as an acceptable image, but applicants still get tripped up translating millimetre measurements into the JPEG their laptop creates. The print measurement you will see most often for an adult passport book is 35×45 mm—a little shorter and narrower than a credit card, with your chin and crown positioned within a defined band on the template.

Digital submissions sometimes arrive through GOV.UK's photo tool, a high-street booth that prints a code, or a bring-your-own upload. Each channel can phrase the pixel requirements differently even when the underlying print size stays the same. The SmartFlexa workflow below begins from a 413×531 pixel frame, which many designers use when they approximate 35×45 mm at about 300 dpi. Swap to Custom if the checker on the page you are using demands another resolution.

Babies, toddlers, and people who need religious head coverings follow extra paragraphs in the official guidance—this landing page cannot replace those notes. What we can do is help you rehearse lighting, crop, and background at home before you spend money on a rejected upload. Everything renders in your browser, so you can tweak glasses glare or stray hairs without sending the file through an unknown cloud pipeline.