For a UK visa or permission you upload a digital photo of your face. GOV.UK publishes the file rules below and no printed size.
Source: GOV.UK, Take a photo of your face for a visa application or permission (https://www.gov.uk/guidance/how-to-take-a-photo-for-a-visa-application-or-permission), checked 31 October 2026. Rules can change: confirm on the official page before you submit.
Make the photo free with no account: it is processed on your device and never uploaded. Voyalo is not a government agency; the authority decides whether it accepts your photo.