How to Say "certified copy" in Spanish
The Spanish word for “certified copy” is “testimonio” — B2 level.
English → SpanishB2
nounB2formal
legal document, affidavit

Examples
Los restos arqueológicos son un testimonio de la antigua civilización.
The archaeological remains are evidence (or proof) of the ancient civilization.
Necesitas un testimonio notarial para validar la hipoteca.
You need a notarized document (certified copy) to validate the mortgage.
Proof vs. Document
In many Spanish-speaking countries, 'testimonio' in a legal office means 'a certified, official copy of a public deed,' like a title or will. It's more specific than just 'documento'.
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