Certify any document on the blockchain in 10 seconds. Military-grade encryption. Zero-knowledge architecture. Mathematically incorruptible.
Enterprise-grade document certification accessible to everyone. No setup, no hardware, no trust required — only mathematics.
Your files are encrypted in your browser before they ever touch our servers. We never see, touch, or store your raw data. Even if our servers are compromised, attackers find only indecipherable noise.
Every document's SHA-256 fingerprint is permanently anchored to the Polygon blockchain. It's mathematically impossible to alter, delete, or backdate a seal once confirmed.
Drag, drop, seal. No appointments, no waiting rooms, no bureaucracy. Your document receives an immutable blockchain timestamp in under 10 seconds.
PDFs, videos, spreadsheets, source code, medical images, CAD files — if it's a file, we can seal it. No format restrictions, no size limits on Enterprise.
Every certificate includes a unique QR code. Any judge, auditor, or client can scan it and instantly verify authenticity — no account needed.
Pro and Enterprise plans include full branding customization. Your certificates carry your logo, your colors, your identity. Your clients never see our brand.
Four simple steps to mathematically prove your document's authenticity forever.
Drag any file into HashNotary. It stays in your browser — nothing uploads yet.
🖥️ Client-Side OnlyYour browser encrypts the file with AES-256 military-grade encryption using your personal password, then extracts the SHA-256 fingerprint. The raw document never travels over the internet.
🔐 Zero-KnowledgeOnly the hash (a 64-character code) is sent to the Polygon blockchain via a smart contract. Date, time, and certifier address are recorded permanently for fractions of a cent.
⛓️ Polygon NetworkYou receive a digital certificate with a scannable QR code. Any auditor or judge can verify your document's authenticity instantly — the screen lights up green: Authentic & Unaltered.
✅ Instant VerificationDrop a file below to see its SHA-256 fingerprint generated instantly in your browser. No data leaves your device.
or click to select a file
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SHA-256 HASH:
✅ Generated entirely in your browser. Zero data transmitted.
No credit cards, no banks, no borders. Pay with MATIC or USDC on Polygon.
Perfect for freelancers who pass the cost to clients
For law firms, agencies, and consultancies
For corporations and automated workflows
Contracts, NDAs, wills, source code timestamps. Prove authorship and authenticity in any jurisdiction.
Learn more →Volume calculations, progress reports, structural analyses. Tamper-proof technical documentation.
Learn more →Clinical trials, DNA tests, equipment calibrations. HIPAA-friendly zero-knowledge architecture.
Learn more →Cargo manifests, customs records, mineral purity traceability. End-to-end certified chain of custody.
Learn more →Diplomas, transcripts, research papers. Eliminate credential fraud with blockchain verification.
Learn more →Experiment data, peer review submissions, patent filings. Immutable proof of discovery timestamps.
Learn more →No credit card. No commitment. Create an account and seal your first document in under 60 seconds.