A United Kingdom child passport (online) photo is 900 × 1200 px on a white or off-white background, saved as a JPEG 50 KB – 10 MB. The head must measure 660 px (55% of the height) from chin to crown, which is the part most photo tools ignore — a photo can be exactly the right size and still be rejected for a head that fills too much or too little of the frame.
| Photo size | 900 × 1200 px |
|---|---|
| Head height (chin to crown) | 660 px (55% of the height) |
| Top of photo to top of hair | about 180 px (15%) |
| Background | White or off-white |
| File size | 50 KB – 10 MB, JPEG |
| Use | Online upload only |
| Expression | Neutral, mouth closed, both eyes open and visible |
| Same photo works for | Passport · online, BNO passport · online |
| Official source | gov.uk |
No. There is no server to upload it to — the cropping, face detection and background removal all run inside this browser tab, and nothing is stored. Turn off your Wi-Fi once the page has loaded and it still works.
Requirements change, and the issuing authority's own guidance is always the authority. These figures are transcriptions of published requirements, offered as a convenience and not as legal advice.