This is the commonly used size: we found no requirement published by the institution. Confirm it before your application.
Tips to get it right the first time
The passport office asks for a photocopy of the front and back of your photo ID, on one side of the paper.
Print at 100% on letter-size (8.5 × 11 in) paper, single-sided.
Bring the original ID too: you must present it at the acceptance facility.
How to do it with Requisito Listo
Open «Photo ID front and back (passport DS-11)».
Scan the front and then the back: the app crops and straightens each side.
Both sides are placed on one A4 page at real size.
Share or save the PDF.
At the end you'll see a checklist: size, file weight, background and format. If something doesn't comply, it tells you what to fix before the portal rejects it.