Convert HTML and Markdown content into Portable Text blocks for Sanity. Use when migrating content from legacy CMSs, importing HTML or Markdown into Sanity, building content pipelines that ingest external content, converting rich text between formats, or programmatically creating Portable Text docum

Portable Text Conversion Convert external content (HTML, Markdown) into Portable Text for Sanity. Three main approaches: 1. markdownToPortableText — Convert Markdown directly using @portabletext/markdown (recommended for Markdown) 2. htmlToBlocks — Parse HTML into PT blocks using @portabletext/block tools (for HTML migration) 3. Manual construction — Build PT blocks directly from any source (APIs, databases, etc.) Portable Text Specification Understand the target format before converting. PT is an array of blocks: Key rules: Every block and span needs key (unique within the array) type: "block" is for text blocks; custom types use their own type markDefs holds annotation data; marks on spans reference markDefs[ ]. key or are decorator strings Lists use listItem ("bullet" "number") and level (1, 2, 3...) on regular blocks Conversion Rules Read the rule file matching your source format: Markdown → Portable Text : rules/markdown to pt.md — @portabletext/markdown with markdownToPortableText (recommended) HTML → Portable Text : rules/html to pt.md — @portabletext/block tools with htmlToBlocks Manual PT Construction : rules/manual construction.md — build blocks programmatically from any source Note: @sanity/block tools is the legacy package name. Always use @portabletext/block tools for new projects. The API is the same.

portable-text-conversion