PlannerBridge
Trello to Microsoft Planner. Every card. No loss.
PlannerBridge migrates your entire Trello workspace into Microsoft Planner — with a complete preview before a single record is written.
Challenge
Your organisation has standardised on Microsoft 365, yet Trello keeps running because nobody has time to migrate dozens or hundreds of boards by hand. Scripted migrations fail silently on archived cards, overflowing checklists and over-long titles — and when a run breaks, you are left with duplicates and gaps. There is no official Microsoft migration path.
Solution
PlannerBridge is a self-hosted web application that reads a Trello team-export and recreates your entire workspace in Microsoft Planner via the Microsoft Graph API — boards become Plans, lists become Buckets, cards become Tasks. A full dry-run simulates the complete migration with zero writes, and every trade-off is disclosed before anything is created.
Why it matters
See before you migrate
The dry-run simulates the entire migration with zero API writes — what you preview is exactly what gets created.
No silent data loss
Archived cards, overflowing checklists and over-long titles are preserved and disclosed, never quietly dropped.
Crash-safe and resumable
Every Trello source ID is mapped to its created Microsoft 365 ID, so re-running after a throttle or interruption resumes without duplicates.
Self-hosted, any tenant
Single-command start, env-driven, against any Microsoft 365 tenant — your data never leaves your own infrastructure.
Features
Full workspace ingestion
Parses every board, list and card (active and archived), plus checklists, comments, labels, attachments and members from the Trello export.
Workspace dashboard
An overview of every board, list and card, with a board browser that makes the whole export searchable before migration.
Dry-run preview
Shows exactly which Microsoft 365 Groups, Plans, Buckets and Tasks will be created — with field-level fidelity notes — before any write.
Fallback bucket
Cards from archived or excluded lists land in a named bucket instead of being lost.
Planner limits handled
The 255-character title, 20-item checklist and 25-category limits are resolved cleanly, with any overflow preserved verbatim in task notes.
Idempotent migration
A SQLite state store records every created resource, so a re-run skips whatever already exists.
Throttle-aware Graph client
The Microsoft Graph client honours Retry-After headers and paces its requests automatically.
Self-hosted in one command
Single-command start, configured entirely through environment variables, with no external SaaS dependency.
How it works
Upload the export
Drop in your Trello team-export ZIP; PlannerBridge parses every board, card and attachment, including archived content.
Review the dry-run
Inspect a complete simulation of what will be created in Planner — every bucket, task and flagged trade-off — with no API call made.
Connect to Microsoft 365
Authenticate via MSAL against your own tenant, scoped to the permissions the migration requires.
Migrate with confidence
Run the live migration; resources are created with full metadata, throttling is handled automatically and the run resumes cleanly if interrupted.
In practice
Validated on an anonymised enterprise export: 197 boards, 17,665 cards, 91 members and 33,073 attachments in a 53 MB ZIP — including German umlauts and emoji in filenames, processed without data loss.
Who it's for
For IT departments and businesses consolidating their tooling onto Microsoft 365, retiring Trello or Atlassian, and needing to migrate task data to a deadline without manual re-entry.
Tech & operation
Self-hosted with a single-command start and environment-variable configuration: a Python FastAPI backend, a vanilla-JS 'Liquid Glass' interface, MSAL authentication and SQLite migration state — running against any Microsoft 365 tenant.
Pricing & model
PlannerBridge is offered as a one-time, perpetual licence per tenant deployment — no per-seat fees and no recurring subscription, matching a migration you run once rather than a tool you keep forever. Early-access terms on request.
FAQ
What happens to data that Planner cannot represent? +
Nothing is dropped silently. Archived and excluded cards land in a dedicated fallback bucket, checklist items beyond the 20-item cap are copied verbatim into the task notes, and over-long titles are truncated while the full original text is kept in the notes. The dry-run shows you every one of these cases before you migrate.
Previous migrations left us with duplicates when they failed halfway. How is this different? +
PlannerBridge maps every Trello source ID to the Microsoft 365 resource it created and stores that mapping locally in SQLite. If a run is interrupted by a network error, throttling or a manual cancel, restarting skips everything already created — the same task cannot be created twice.
Is PlannerBridge available now? +
PlannerBridge is in early access (beta). Ingestion, the workspace dashboard, the board browser and the dry-run are complete and verified; member mapping, the Microsoft 365 sign-in screen and the live-migration progress view are being finalised. Early access is open to organisations with an active migration need.