VeriLock provides free document signing and optional fingerprinting on the blockchain for future verification, all without file uploads.
Multi-party document signing. Free.
How to sign a document privately without uploading
Works with PDF or image files. The document stays on each party's device from start to finish.
- Fingerprint locally. Drop the document in your browser. VeriLock computes a SHA-256 fingerprint on-device; file bytes never upload.
- Invite and sign. Share a link. Each co-signer matches the same file and signs with a Nimiq wallet. Multi-party signing is free.
- Print or lock. Print the signed copy at no cost, or optionally lock the fingerprint on the Nimiq blockchain for permanent proof (1 credit).
How to verify a signed document without uploading
Check whether your PDF or image matches a VeriLock fingerprint lock. Re-hashing runs in the browser; file bytes never upload. No wallet required for a basic check.
- Re-hash locally. Drop your copy of the document in the browser. VeriLock computes a SHA-256 fingerprint on-device; file bytes never upload for the integrity check. You can verify a file here.
- Match a lock. Compare the fingerprint to a locked agreement via invite link, lookup, or My agreements. No wallet is required for a basic verification.
- Read the result. A match means your file has the same bytes as the locked fingerprint - not that VeriLock stores the document. Mismatch means the copy differs from what was locked.
How can I sign documents free online safely?
Fingerprint the document in your browser so the file never uploads. Invite co-signers with a link; each party matches the same bytes and signs. Optional Nimiq wallet identity binds who signed. Free multi-party signing stays on-device - lock the fingerprint on-chain later only if you need permanent public proof.
Free document signing FAQ
Is document signing really free on VeriLock?
Yes. Multi-party document signing is free: create an agreement, invite co-signers, collect signatures, and print the signed copy. Credits are only for optional paid steps - locking a permanent document fingerprint on the Nimiq blockchain (1 credit), or storing signature and field data on-chain. No subscription is required to sign.
How can I sign documents free online safely?
Fingerprint your file in the browser so bytes never upload. Share an invite link; each party matches the same document and signs. Optional wallet identity binds signers cryptographically. Free signing stores agreement metadata only - lock later if you need independent on-chain proof anyone can re-check.
Do I need to upload my document to sign free?
No. VeriLock computes a SHA-256 fingerprint on your device. Servers keep agreement metadata and that short fingerprint string - never your document bytes. Each party holds their own copy of the file from start to finish.
What is free signing versus locking on the blockchain?
Free covers create, invite, co-sign, My agreements, and print. Locking anchors the document fingerprint on Nimiq as a permanent integrity proof (1 credit). Optional on-chain data backup can archive signature placements for additional credits. Signing stays free either way.
Can co-signers sign documents free without a subscription?
Yes. Invitees open the link, drop the shared file, complete fields, and sign at no cost. There is no per-seat fee and no monthly plan for free multi-party signing. Credits are only for permanent lock or optional on-chain data backup.
Standards & references
- W3C Web Cryptography API - browser crypto for local SHA-256 fingerprinting
- W3C XML Signature Syntax and Processing - industry digital signature model for integrity and signer binding
- Nimiq Developer Center - Nimiq wallet identity and on-chain transaction documentation
- NIST FIPS 180-4 (SHA-256) - hash algorithm used for document fingerprints
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