What size should a printed passport photo be?

US: 2×2 in (51×51 mm). UK: 45×35 mm. Canada: 50×70 mm. Australia: 35–40 mm wide by 45–50 mm high. India (applying in India): 45×35 mm.

Rules checked on · official sources only

What each country says

CountryAnswerOfficial quoteSourceChecked
United StatesPassport 2 x 2 inches (51 x 51 mm), with the head 1 to 1 3/8 inches (25-35 mm) from chin to top of head. The correct printed size of a passport photo is 2 x 2 inches (51 x 51 mm). The size of your head in the printed photo must be between 1 -1 3/8 inches (25 - 35 mm) from the bottom of the chin to the top of the head. travel.state.gov
United KingdomPrinted photo UK printed photos: 2 identical photos, 45mm high by 35mm wide, not cut down from a larger picture; head (crown to chin) 29mm to 34mm. They must: measure 45 millimetres (mm) high by 35mm wide (the standard size used in photo booths in the UK) not be a cut down version of a larger picture The image of you - from the crown of your head to your chin - must be between 29mm and 34mm high. gov.uk
CanadaPrinted photo 50 mm wide × 70 mm high (2 × 2¾ in). Face height from chin to crown must be 31–36 mm (1¼–1⁷⁄₁₆ in). They must be 50 mm wide by 70 mm high (2 inches wide by 2¾ inches high). The height of your face must measure between 31 mm (1¼ inches) and 36 mm (1⁷⁄₁₆ inches) from chin to crown (top of head). canada.ca
AustraliaPrinted photo 35–40 mm wide by 45–50 mm high, with face (chin to crown) 32–36 mm. Your photos must be: 35–40 mm wide 45–50 mm high. The height of your face, from your chin to your crown, must be 32–36 mm. passports.gov.au
IndiaApplying in India · Indian embassy page — check with your mission Passport application in India: 4.5 cm × 3.5 cm (45 × 35 mm), colour. Abroad, Embassy of India Buenos Aires asks 2 × 2 inches. Paste your recent passport size photograph (4.5 cm length x 3.5 cm width) in colour in the box meant for affixing the photograph 1) The image should be 2 inches by 2 inches; passportindia.gov.in
indembarg.gov.in
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Answers quote the official pages linked above. Not affiliated with any government. Final acceptance is up to the issuing authority.