Crop and resize your photo to 600 × 750 pixels, the minimum the UK online passport service accepts.
For online applications, GOV.UK asks for a digital photo at least 600 pixels wide and 750 pixels tall, with a file size between 50 KB and 10 MB. The background should be plain and light, with no shadows, and your face should be clearly visible with a neutral expression. Check the current rules on GOV.UK before applying.
A larger photo is fine as long as it stays under 10 MB. 600 × 750 is the minimum, not a fixed size.
Very small files lose the detail needed to check your face. Don't compress below 50 KB.
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