Headless CMS · Migration
WordPress to Sanity Migration: The Complete Process
By George Shvaya · Updated July 2026 · 10 min read
A WordPress to Sanity migration replaces a theme-and-plugin website with a structured content system: WordPress content is inventoried and documented, remodeled as Sanity schemas, moved by repeatable scripts rather than by hand, rendered by a new frontend, and verified URL-by-URL against a pre-migration baseline before anything cuts over. This guide walks through that process the way we actually run it — including the cases where the honest recommendation is to stay on WordPress.
First: Should You Migrate at All?
Migrate when the content model has outgrown the platform: pages assembled from brittle shortcode stacks, content that needs to feed more than one channel, editorial workflows fighting the block editor, or performance ceilings that plugin optimization can't fix. Don't migrate to chase a trend. WordPress remains the right tool for plenty of sites — we say that as a team that offers WordPress development alongside Sanity development. If the deciding factor is the platform comparison itself, start with our Sanity vs Strapi breakdown or the platform selection guide.
The Five Phases
Content Inventory & Baseline
Export nothing yet — document first. A full crawl records every URL, title, meta description, and structured-data block; Search Console exports capture which pages actually earn impressions; the plugin list is catalogued with a decision for each. This baseline is the contract the migrated site is verified against.
Schema Design
WordPress content is modeled as Sanity schemas: posts and pages become typed documents, categories and tags become references, authors become person documents, and repeating page sections become structured objects instead of shortcode soup. This is where migrations are won — a lazy one-post-type-to-one-document mapping just recreates WordPress in Sanity.
Scripted Transformation
Content moves by script, never by hand: the WordPress REST API or WXR export is transformed into Sanity documents and imported via Sanity's import tooling, with HTML converted to Portable Text and media relocated to Sanity assets or your CDN. Scripts are repeatable, so the migration can be rehearsed as many times as needed.
Frontend Build & Parity Check
The new frontend (typically Next.js) renders the migrated content in staging, and the site is compared against the baseline URL by URL: content parity, metadata parity, structured-data parity, and a redirect map covering every URL that changes shape. Nothing cuts over until the comparison is clean.
Instrumented Cutover
Final content sync, redirect deployment, DNS/deployment cutover, sitemap resubmission — with analytics and conversion events verified live before launch is called done, and Search Console watched against the baseline in the weeks after.
If those phases look familiar, they are the migration-specific version of the documented-baseline, side-by-side-comparison, instrumented-launch process we publish in our methodology — the same discipline applies whether the destination is Sanity or any other platform.
What Actually Goes Wrong in These Migrations
- Silent URL loss. Category archives, pagination, and media attachment pages get forgotten because nobody inventoried them. The crawl in phase 1 exists to make forgetting impossible.
- Shortcode debris. Raw
[shortcode]markup imported as literal text. The transform script must resolve or strip every shortcode deliberately. - Metadata regression. Titles and descriptions maintained by an SEO plugin never made it into the export. They are part of the baseline, and parity against them is checked before launch.
- One-shot migrations. A hand-run, unrepeatable import means the rehearsal was the performance. Scripts must be re-runnable against fresh content.
What You Gain on the Other Side
Content as structured documents instead of rendered pages: typed entities with references, queryable by GROQ, editable in a Studio shaped to your workflow, and mapping directly onto schema.org markup — the entity-level clarity that both classic search and AI answer engines reward, and the foundation of the entity SEO work we specialize in. Webvello is an independent development partner and is not affiliated with Sanity Inc. or Automattic.
Frequently Asked Questions
How long does a WordPress to Sanity migration take?
It depends on content volume, how consistently the WordPress content was structured, and how much of the frontend is being rebuilt at the same time. A content-only migration of a well-structured site is measured in weeks; a migration combined with a full frontend rebuild is a larger project. We scope the timeline in writing after the content inventory — anyone quoting a fixed timeline before seeing your content is guessing.
Will migrating from WordPress to Sanity hurt my SEO?
Not if URL parity is treated as a launch requirement. Every indexed WordPress URL must either resolve identically on the new frontend or redirect deliberately to its successor, and titles, metadata, and structured data are compared against a documented pre-migration baseline before cutover. Rankings are lost when migrations skip that discipline, not because the CMS changed.
What happens to WordPress plugins in a Sanity build?
Plugin functionality does not transfer — it is reimplemented in the frontend or replaced by services. Forms, SEO metadata, galleries, and similar features become code you own in the new stack. Part of the content inventory is listing every plugin and deciding: reimplement, replace, or retire. Many plugins exist only to work around WordPress limitations and are simply no longer needed.
Can I keep publishing in WordPress during the migration?
Yes, with a content freeze only at the very end. Migration scripts are repeatable: they run against a snapshot for development and testing, then re-run against fresh content just before cutover, so editors keep working in WordPress until the final sync window — which is typically short.
Planning a WordPress to Sanity Move?
The first deliverable is the content inventory and baseline — you keep it whether or not you migrate with us.