Schrijfwijzer is a Dutch-language writing and language reference developed by author Jan Renkema and published by Boom Uitgevers Amsterdam. Since its first publication in 1979, it has served writers in the Netherlands and Flanders as a practical guide to producing clear, effective texts. Its sixth, fully revised edition, published in 2020, includes updated examples and access to an e-book and more than 1,000 online exercises with feedback.

The Schrijfwijzer website extends the book with resources for writers and learners. Visitors can explore frequently asked language questions, spelling issues, commonly confused words, and video lessons on language dilemmas. The site also offers text analysis based on the CCC model, online practice, and information about the book and its author. Jan Renkema is an emeritus professor of text quality at Tilburg University, with a background in linguistics and extensive experience in language advice and education. Together, the book and online materials provide practical support for understanding language choices and improving written communication.