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Stop PDF leaks without DRM.

Low-visibility grid fingerprints for PDFs — trace any leak to the original purchase. No viewer lock-in.

Add a low-visibility forensic grid to each download in seconds. Buyers get normal files; you can verify any copy later with a single API call.

Read the Docs Woo plugin (ZIP) Download Integrity Tool
Integrity Check (Free Tool) · Analyze whether a document has been modified after distribution and whether its origin remains recoverable. Runs locally. No account required.
By purchasing, you agree to our Terms, Refund Policy, EULA, and Privacy Policy.

Why InkDNA exists

Most systems try to prevent copying. InkDNA does not.
Files will be shared. Files will be leaked.
We make sure they remain attributable.
No DRM. No lock-in. No surveillance.
Only attribution.

Integrity Model

InkDNA assumes files will leak. It ensures they remain attributable.

🟢 Designed for

  • Attribution of distributed files
  • Detection after metadata stripping
  • Verification from degraded copies
  • Origin recovery without relying on metadata

⚪ Not designed for

  • Preventing copying or redistribution
  • Surviving aggressive content rewrites
  • Acting as DRM or access control
  • Guaranteeing identification in all conditions

Forensic PDF watermarking use cases

inkdna helps ebook sellers, course creators, WooCommerce stores, paid report publishers, research teams, agencies, and digital product businesses trace leaked PDF downloads back to the original order or purchase. The service applies a low-visibility forensic grid at download time, preserving normal file access without DRM, custom viewers, or account lock-in.

Why InkDNA

🧬 Forensic grid & traceable

Each file gets a low-visibility forensic grid so leaks can be traced to their source — beyond visible watermarks.

⚡️ Developer-first

Simple REST API with JS & Python SDKs. Works with WooCommerce, Shopify, Zapier & Make.

🔒 Private by default

No content stored beyond processing. Bring your own storage and keep control.

🚀 Fast setup

Paste your key, call /mark and /detect, and you’re live in minutes.

Starter
…
For independent authors & micro-presses
  • 50 MB per PDF · 500 pages
  • 1,000 ops / month
  • Email support
Pro
…
For independent creators & small shops
  • 100 MB per PDF · 1000 pages
  • 2500 ops / month
  • Priority email support
Enterprise
Custom*
  • 150 MB per PDF · 2000 pages
  • 5,000 ops / month
  • Higher concurrency & SSO
  • Volume pricing, SLA, onboarding

* Final price shown at checkout. Higher limits available via sales.

Need higher limits or enterprise terms? Contact us.