Nine-box grid anonymisation is the removal of identifiers from a potential-versus-performance chart so no one is named. UK GDPR Recital 26 puts anonymous data beyond the rules. anonym.plus marks each name on your device, so the cell placements stay clear while the staff stay private.
When this applies
Leaders calibrate the chart across a team. You anonymise the names first, so it can be discussed and stored under the Recital 26 bar.
How anonym.plus handles it
- Open the chart in anonym.plus on your device.
- Built-in OCR reads a scanned slide.
- The app marks names placed in each cell.
- Confirm the markings and keep the axis labels.
- Swap each name for a cell code.
- Save the cleaned copy locally.
What you need to provide
- The chart (PPTX-as-TXT, PDF, XLSX-as-TXT).
- An operator (Replace keeps cells legible).
- Optional alias map, OFF for true anonymity.
PII entity types detected
| Category | anonym.plus entity type | Example |
|---|---|---|
| Names | PERSON | Nora Iqbal → CELL9_2 |
| Org | ORGANIZATION | Platform Team → [TEAM] |
| Contact | EMAIL_ADDRESS | n.iqbal@example.co.uk → [EMAIL] |
| Dates | DATE_TIME | rated 2025 → [DATE] |
| Location | LOCATION | Leeds site → [SITE] |
| Demographic | NRP | returner group → [GROUP] |
Compliance achieved
- Aims at the anonymity test in UK GDPR Recital 26.
- Keeps potential ratings out of named storage.
- Offline work keeps the chart off any server.
- AES-256-GCM guards working copies.
Anonymise nine-box grids offline — see plans & start free →
Limitations & cautions
A near-empty cell gives it away. If only one person sits in the top tier, the placement alone identifies them. Aggregate or suppress thin cells before sharing.
Frequently asked questions
Can a single-person cell still identify someone?
Yes. A lone placement is easy to trace, so Recital 26 anonymity may need you to suppress or merge thin cells.
Will the axes survive the pass?
Yes. Only names are coded. The potential and performance axes stay intact for the discussion.
Is the chart uploaded?
No. The desktop app runs locally, so the slide stays on your machine.