Redact sensitive documents
in seconds.
Upload your document, let AI detect sensitive data, review every redaction, and export a securely redacted PDF.
Flattened PDFs — no hidden text, no copyable data behind redactions.
Service Agreement
Between and , contract no. shall apply as of .
Contact: ·
IBAN:
Total amount due: .
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Built for compliance teams that ship.
Everything you need to safely redact contracts, invoices, IDs and reports — directly in your browser.
AI Detection
Automatically detect names, addresses, payment details, emails and other sensitive information.
OCR for scans & images
Recognize text inside scanned PDFs, JPGs and PNGs — multi-page documents fully supported.
Manual Control
Draw redaction rectangles directly on the document. Move, edit and review every change before export.
Secure Export
Your final PDF is flattened and permanently redacted — no hidden text, no copyable data, no recovery.
Add a watermark while you're at it
Redaction stays the main act — watermarking is a small extra for drafts, NDAs and confidential copies you send out.
- Your logo or oursDrop in a PNG, JPG or SVG. No logo? We use the Blackline mark.
- Three densitiesLight, medium or heavy — tiled across every page in greyscale.
- Everywhere you workEditor, browser extension, desktop watch-folders — same one switch.
Four steps. Zero leaks.
Drag in a PDF, JPG or PNG. Multi-page documents are loaded instantly.
OCR reads every page and the AI flags sensitive entities by category.
Toggle categories, remove false positives, or draw your own redaction areas.
Download a flattened PDF where every redaction is permanently burned in.
Built for sensitive documents.
A black rectangle over text is not redaction. Blackline AI re-renders every page so the original content is physically removed from the exported document.
Pages are re-rendered as flat images before being embedded into the final PDF. The original text behind a redaction never reaches the output file.
All document parsing and rendering happens in your browser. Only the extracted text is sent to the AI for detection.
Final PDFs contain no selectable text, no metadata leaks, and no recoverable layers underneath the black bars.
Work even faster — plug Blackline into your stack.
Redact and watermark right where your documents already live: CRM, sales, e-signature and 5,000+ apps via Zapier. No copy-paste, no detours.
- One-click connect
- Available on every plan
- No-code via Zapier
Redacting all day? Give your team the fast lane.
Managed folders that redact automatically with AI, optional four-eyes approval, role-based access and a full audit log — without ever storing an original document.
- Managed redaction folders
- Four-eyes approval workflow
- Zero storage — browser-native
- Roles, audit log & SHA-256 proof
Made for law firms, clinics, banks, HR, accounting, notaries.
Ready to redact? It takes seconds.
No account required to try. Process your first document right in the browser.
Start redacting