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Deltawall
Use case · Safe file uploads

Documents scanned on the device, before the upload completes.

The file picker, drag-and-drop and paste all pass through one on-device scan with the same engine as prompts. Sensitive files are stopped, and the banner names what was found.

Blocked by Deltawall: a spreadsheet stopped on upload because it contains BSN, IBAN and card numbers.
The problem

A single spreadsheet can carry thousands of identifiers.

File uploads

Sensitive documents dropped into AI tools.

The challenge

Reconciliation files, customer exports and contracts are uploaded to AI tools for summarising and analysis, each carrying far more regulated data than any prompt.

Why existing controls miss it

Upload inspection usually needs a proxy that decrypts traffic, or a CASB integration that only covers sanctioned SaaS through its API.

How Deltawall enforces it

Deltawall parses the file in the browser before the upload request is made. If it contains a class your policy blocks, the upload is stopped and the classes are named. Nothing is sent to be analysed.

  • PDF, DOCX, XLSX, PPTX, CSV, TXT, MD and JSON
  • Scanned PDFs flagged as uninspectable
  • Fails open on error or timeout
User experience

A clear reason, not a dead end.

The banner tells the user which data classes were found and suggests the safe path: remove them, or attach a sanitised copy.

  • Stopped, not rewritten: the original file is never modified
  • The same rule set as prompts
  • Recorded as one line in the evidence log
Deltawall coaching: sensitive content detected, provide a justification to proceed.
How pricing works

Four steps. Quoted in writing.

Every tier includes the whole platform. What changes with size is the price per user, the setup scope and the service level.

Step 01

Paid proof of value

Thirty days in your own browser estate, up to 100 users, on your sector's template. Credited in full against year one.

Step 02

Tier by headcount

Starter for 100 to 249 protected users, Growth for 250 to 999, Enterprise from 1,000.

Step 03

One-time setup

Rollout through your MDM, policy tuning to your data, and the works-council documentation.

Step 04

Annual contract

Per protected user, billed annually. Monthly billing is available with a surcharge.

See the tiers

Questions

What buyers ask.

Can Deltawall redact inside a document?

Not today. A file that needs redaction is stopped, and the user is asked to attach a sanitised copy. In-place document redaction is on the roadmap.

What about scanned PDFs?

They are flagged as uninspectable, because there is no OCR. Your policy decides whether uninspectable files may be sent.

Get started

See it stop real-looking data in a real browser.

A 30-minute technical walkthrough: a prompt redacted, a file stopped, the dashboard, and an evidence pack verified offline in front of you.

No slide deck. Synthetic data only.

The VU Amsterdam campus in the Zuidas at blue hour, lit windows reflected in a wet plaza with bicycles parked out front.
Where we are

Built in Amsterdam, at VU StartHub.

Deltawall works from VU StartHub, the startup hub of Vrije Universiteit Amsterdam, on campus in the Zuidas. Meet the team for a demo in person.

VU StartHub, NU Building
De Boelelaan 1111
1081 HV Amsterdam, the Netherlands