A certified translation is the translated document plus a signed certificate of accuracy. The translation mirrors the original layout, brackets every stamp and seal at its position, and marks illegible text as illegible. The certificate names the translator, states their competence, and carries their signature and contact details.
Most translation sites never show their product. Here is ours.

Illustrative, with placeholder details rather than any real person’s document.
As a PDF, which USCIS accepts for both online and paper filings. A mailed hard copy is available for $14.95 if your recipient wants one, and notarisation for $19.95 where a consulate or state agency asks for it — USCIS does not. The full list is on the pricing page.
A single blanket certificate covering a stack of documents is a common shortcut and a common reason for questions. Each document you file gets its own certificate naming that document, because that is what the regulation asks for.
Send it on WhatsApp. You get the page count and the exact price back in the chat, and nothing is charged until you agree to it.