Document SHA-256 Hash & Tamper Analyzer
Compute the bit-for-bit cryptographic digest of any PDF, contract, or image directly on your device. Compare two documents side-by-side to instantly detect tampering.
Your file is read exclusively into local device memory using the HTML5 File API and digested via the W3C Web Cryptography standard (`window.crypto.subtle`). Not a single byte is sent over the network.
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Select or drop a file to compute its 256-bit cryptographic digest. Useful for verifying contract integrity before signing.
Frequently Asked Questions
Is my document uploaded to your servers when computing the hash?
No. Your document is processed entirely inside your local browser sandbox using the W3C Web Cryptography API (`crypto.subtle.digest`). The file is read directly into device memory and is never transmitted over the Internet, ensuring total confidentiality for NDAs, financial audits, and payroll records.
What is a SHA-256 document fingerprint?
SHA-256 (Secure Hash Algorithm 256-bit) is a cryptographic hash function that produces a unique 64-character hexadecimal digest representing the exact binary contents of a file. If even a single punctuation mark, space, or metadata tag is modified, the resulting hash changes completely (known as the avalanche effect).
How does DocuVerified use SHA-256 for public verification?
When you issue an official document in the DocuVerified Workspace, its SHA-256 hash is anchored onto an immutable distributed ledger. Third parties (banks, embassies, employers) can scan the QR code on the printed document or upload the PDF to immediately verify that the document matches the original issued record bit-for-bit.