Ketch and OneTrust
Migrate off OneTrust without forcing every visitor to consent again, and without having to re-tag every script before cutover.
About OneTrust
Switching consent management platforms creates two real risks if handled naively: showing a fresh consent banner to visitors who already made a choice under the old platform, and breaking script behavior for any page still tagged with the old platform's category attributes. The OneTrust Consent Migrator is built to avoid both.
Capabilities
How the OneTrust Consent Migrator works
The migrator has three components. First, a Local Device Rapid Read (LDRR) reads OneTrust's own `OptanonConsent` cookie, the one OneTrust uses to store a visitor's existing consent choices, and sets that same consent state directly in Ketch. This prevents an auto-initiated Ketch banner from appearing for visitors who already made a choice under OneTrust, during the migration window.Second, a OneTrust Consent Listener continues listening for OneTrust consent events even after that initial read, for as long as an active OneTrust script is still running on the page. This lets a site keep rendering the OneTrust-branded experience on the frontend during a transition period, while Ketch orchestrates consent behind the scenes.Third, and most directly useful for reducing migration friction, Ketch can execute scripts still wrapped in OneTrust's own consent group tags. When enabled, Ketch evaluates the consent a visitor has actually given and applies a OneTrust-to-Ketch mapping directly to client-side scripts still using OneTrust's `optanon-category-*` attributes. That means scripts don't all need to be re-tagged to Ketch's own purposes before cutover; Ketch can honor the existing OneTrust tagging scheme in the interim.This migrator is specifically built for the OneTrust Cookie Consent script; a different OneTrust product may not work as designed, and Ketch Support can advise on migrations involving other OneTrust modules.
With Ketch, teams can
- Avoid re-prompting visitors who already consented under OneTrust, using the LDRR to carry that choice into Ketch directly
- Keep a OneTrust-branded frontend running temporarily while Ketch orchestrates consent behind the scenes
- Execute scripts still tagged with OneTrust's own category attributes, without requiring a full re-tagging effort before cutover
The gap
The problem this integration solves
A naive migration off any incumbent CMP creates real friction that a well-built migrator specifically avoids:
02. Requiring every script across a site to be re-tagged to new purpose categories before cutover is real engineering work that can delay a migration significantly
03. A hard, all-at-once cutover leaves no room for validating the new platform's behavior against the old one before fully committing
Ketch's migrator resolves the first by reading and honoring existing OneTrust consent directly, the second by executing OneTrust-tagged scripts directly rather than requiring re-tagging first, and the third by supporting a transitional period where OneTrust's frontend and Ketch's orchestration coexist.
Why Ketch
Why teams choose Ketch's OneTrust Consent Migrator
Permissioning infrastructure that governs OneTrust the same way it governs every other system in your stack — not a one-off connector bolted onto a banner.
Doesn't force visitors to re-consent
Existing OneTrust consent choices carry directly into Ketch through the LDRR mechanism.
Doesn't force a script re-tagging project before cutover
Ketch can execute scripts still using OneTrust's own category tags directly.
Backed by enforcement precedent
Regulators increasingly expect businesses to demonstrate real, continuous consent enforcement, the same expectation a migration needs to satisfy without a gap during the transition itself.
Questions about the OneTrust integration
Related reading
Expert insights for teams connecting OneTrust
Integrations
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