The basics
The UK printed size is 35 × 45 mm. For online applications you upload a digital photo that is a JPG, at least 600 pixels wide and 750 pixels tall, and between about 50KB and 10MB.
Background and lighting
A plain light-coloured background (light grey or cream), no shadows on your face or behind you, and no reflections or red eyes.
Face and expression
Look straight at the camera with a neutral expression, mouth closed and both eyes open and visible. Hair should not cover your eyes. Glasses are only allowed if there is no glare and your eyes are clear.
Make it with PicFitter
Use the UK passport photo maker to crop 35 × 45 mm at 300 dpi (413 × 531 px). If the upload page needs a smaller file, try the 500KB tool.
Check the official page
Requirements are set by GOV.UK and can change. Read them before you apply; this site cannot guarantee a photo will be accepted.