Smallpdf is a popular online PDF tool – but real redaction means uploading your documents first. Blackline AI processes PDFs entirely in your browser: sensitive data never leaves your device.
| Feature | Blackline.AI | Smallpdf |
|---|---|---|
| Redact without an account | Yes | Yes |
| Processed locally in the browser | Yes | No |
| AI auto-detects sensitive data | Yes | No |
| Free usage | 10 pages free | 2 documents/day |
| Permanently flattened export (unrecoverable) | Yes | Partial |
| Custom watermark with your own logo | Yes | Yes |
| GDPR-first, no document storage | Yes | Partial |
Tick a category — the AI finds every match in the document and blacks it out. Names, amounts, IBANs, addresses and more, in seconds.
Service Agreement
Between Sarah Bennett, 14 Kingsway, London WC2B 6LH and Northwind Ltd.
Consulting fee 4.250,00 EUR · Setup 890,00 EUR
Payable to IBAN DE44 5001 0517 5407 3249 31
Signed by Mark Feldmann · Total 5.140,00 EUR
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For confidential documents – payslips, medical records, contracts – every upload is an unnecessary risk. Blackline AI redacts locally, detects sensitive data with AI and exports permanently flattened PDFs.
Yes: redact up to 10 pages per document for free, no sign-up required. Affordable Pro plans cover longer documents and teams.
Yes. On export the document is rendered and flattened – redacted text is technically unrecoverable, unlike simple black highlights.
No. OCR and AI analysis run in your browser. Your documents never leave your device.