How to Say "official seal" in Spanish
The Spanish word for “official seal” is “timbre” — B2 level.
English → SpanishB2
nounB2formal
Mark of authenticity

Examples
Necesitas comprar un timbre fiscal para validar este contrato.
You need to buy a revenue stamp to validate this contract.
El abogado revisó que el documento tuviera el timbre oficial.
The lawyer checked that the document had the official seal.
Timbre vs. Sello
While both can mean 'stamp,' 'timbre' usually refers specifically to the official or tax fee required on government or legal documents. Use 'sello' or 'estampilla' for postal stamps.
Related Translations
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