The safest starting point is the application itself: identify the document, the country, and whether the photo is being uploaded, printed or both.
Make the session easier before touching the editor
Prepare the room, background and camera before bringing the applicant into position. For a baby or an applicant who needs physical support, take several originals and choose later. For an accessibility situation, follow any authority-specific accommodation instructions rather than forcing an adult “standard pose.”
What to keep from the session
Save the original frames and note which image was used. That makes it possible to produce another required output later without reshooting the applicant under time pressure.
Do not confuse a preview with approval
A green check in a photo tool is a preparation signal, not a government acceptance decision. Use the tool to produce a cleaner file and the official workflow to decide whether it is acceptable.
Why size charts need context
Charts are useful for quick reference but often flatten important differences between passport, visa and identity-card workflows. Head size, recentness, background, print method and editing rules can matter just as much as the outside dimensions.
Use the chart to orient yourself, then confirm the live application instructions.
A note for this exact search
A practical habit is to preserve the source image and note why the final crop was made. Future versions can then be created from the original instead of from an already-resized JPEG.
Passport Photos for People With Disabilities
Use the Studio after you have confirmed the requirement: upload or capture, prepare the image, then export the document-specific result.