How to Say "in writing" in Spanish
The Spanish word for “in writing” is “escrito” — A1 level. This is a very common word in everyday Spanish.

Examples
Necesito una respuesta escrita antes del lunes.
I need a written answer before Monday.
El examen está escrito en inglés y español.
The test is written in English and Spanish.
Agreement is Key
As an adjective, 'escrito' must change its ending to match the gender (masculine/feminine) and number (singular/plural) of the person or thing it describes. For example, 'reglas escritas' (written rules).
The Special Verb Form
'Escrito' is the special past form of the verb 'escribir' (to write) and is used with 'haber' to form perfect tenses: 'He escrito un libro' (I have written a book).
Forgetting Gender Match
Mistake: “La nota fue escrito en el papel.”
Correction: La nota fue escrita en el papel. (The feminine noun 'nota' requires the feminine form 'escrita').
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