How to Redact PDFs by Line, Paragraph, or Pattern
The Problem
Most PDF libraries see documents as glyph soup - individual characters positioned at x,y coordinates. Finding "the line that starts with SSN:" means reconstructing text from scattered glyphs, guessing word boundaries, and hoping the layout algorithm got it right.
That's why redaction is so hard. You can't select what you can't find.
Structured Document Model
- PDFDancer parses PDFs into words, lines, and paragraphs - not character coordinates
- Select content the way you think about it: "the line starting with SSN:" or "all lines matching this pattern"
- True redaction - content is permanently removed from the PDF, not just covered with a black box
Full Code
Works instantly in guest mode - no API key required.
Why It Works
- Findable content: Select by line, paragraph, or regex - work with the document, not the PDF
- Permanent removal: Content is deleted from the PDF, not covered with a black box
- Batch processing: Apply the same selection logic across thousands of documents
- Compliance-ready: HIPAA, GDPR, PCI-DSS - audit-safe output
Automate the Detection, Not Just the Redaction
- Semantic analysis: Understands document context, not just keyword matching — handles invisible text, vector text, and text in images
- Confidence scoring: ML model returns labeled findings with confidence scores you control — your logic sets the threshold
- True binary-level redaction: Content is permanently eliminated from the file, not cosmetically masked
- Published benchmarks: We publish precision, recall, and F1 scores by entity category — no vague claims
The code above automates removal, but you still define what to look for. PDFDancer's Automated Redaction SDK handles both — a purpose-built ML model detects and classifies PII across your documents automatically, so your reviewers focus on edge cases, not every page.
Available as an add-on for Pro and Enterprise plans.
Available SDKs
- Python — pip install pdfdancer-client-python
- Node.js / TypeScript — npm install pdfdancer-client-typescript
- Java — Maven / Gradle
Start Using PDFDancer Today
Get started in seconds with our free tier. No credit card required.