Requirements by destination

Every specification here was read off the platform’s own documentation, and every page shows the link and the date it was checked. Where a platform publishes dimensions but no file size limit, we list the dimensions and leave the size blank rather than inventing a plausible number.

This list is deliberately short. A destination is only added when we can find and cite an official page for it, because someone whose passport photo or product listing is rejected on our say-so has been actively harmed. If a platform you need is missing, it is because we could not verify it — not because we forgot.