For online UK passport applications the digital photo must be at least 600 pixels wide and 750 pixels tall and between 50 KB and 10 MB. This tool crops to the right shape and saves a 900 × 1125 px JPEG well inside those limits.
Source: GOV.UK – Photos for passports. Rules can change; always check the official page before you submit.
No. It sets the correct size, shape and file size. You still need to follow the official rules on background, pose and lighting.
No. Cropping and compression happen in your own browser. Nothing is sent to a server.
Use a photo with space around the head, or switch "Position" to "Centre". The tool keeps the top of the photo by default, where the head usually is.
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