I need

Seal any document.
Prove it’s genuine.
To anyone. Any time.

DocuLock applies a cryptographic seal to any file. If it’s been altered — any change at all — verification fails instantly. Independent proof you can show to anyone, without asking them to trust your word.

  • SHA-256 · TLS 1.3
  • SOC 2 aligned
  • REST + Webhooks
Upload any document Seal SHA-256 fingerprint v1 v2 Record sealed & timestamped Verify provable to anyone
Who uses DocuLock
Practice tier · Small teams up to 5

Sole traders and small practices.

Accountants, HR consultants, and small law firms who issue documents on behalf of clients. Seal contracts, offer letters, and filed records - proof of exactly what was issued, that nobody can dispute after the fact.

Single organisation, up to 5 users
Tamper detection on every sealed document
Timestamped audit trail per document
Works alongside your existing document storage
See Practice pricing →
Firm tier · Teams up to 20

Established firms with reputations to protect.

Law firms, financial advisers, and architecture practices where document integrity is a professional obligation. A full audit trail across your team, with the confidence to show it to clients, regulators, or a court.

Up to 20 users, single organisation
White-label verify pages under your brand
Custom verify link for client-facing proof
Priority support
See Firm pricing →
Enterprise · Resellers & integrators

One account. Many clients.

Compliance consultants, IT support firms, and platform developers who manage documents across multiple client organisations. Separate audit trails per entity, a single dashboard, and the option to embed DocuLock under your own brand.

Multi-client dashboard, separate audit trails
Seal on behalf of client organisations
Embedded API licensing for platform builders
White-label — your brand, our infrastructure
Introducer & reseller arrangements →

The seal doesn't lie.

01
Seal your file
Send any document to the API. DocuLock computes a unique cryptographic fingerprint in milliseconds. Any format, any size.
02
We store the proof
The seal - a SHA-256 hash - is timestamped and stored independently. Nobody can alter it after the fact, not even us.
03
Share with confidence
Send the document to clients, courts, or auditors. The sealed record exists independently of your systems.
04
Verify any time
Send the document back. Get an instant pass or fail - and exactly when the seal was applied.
Live Demo

Seal it. Alter it. Prove it.

Seal any document. Then upload the same file, altered or untouched. DocuLock tells you instantly whether it's genuine or has been tampered with, and exactly when the original was issued.

01 Seal a document

Drop a file here or

02 Upload to verify

Upload the same file, altered or original

Drop a file here or

Type anything.
Watch it become immutable.

Try a preview of our sealing process. Type or paste some text. Change one character and the seal changes completely.
We apply the same process to your files and documents, creating a unique SHA-256 hash that proves their integrity, permanently.

Your documents,
your way.

Some documents are meant to change. Contracts get amended, policies updated, offers revised. Seal each version as it's issued - DocuLock records the full history, every version cryptographically linked. Nothing lost, nothing disputed.

SHA-256 · DocuLock Seal
enter content above to generate seal

Keep working the way you work.

DocuLock adds cryptographic proof to documents in your existing stack.
No migration, no new tools, no disruption.

  • Microsoft 365
  • SharePoint
  • OneDrive
  • Google Drive
  • Dropbox
  • Box
  • iManage
  • NetDocuments
  • Amazon S3
  • GitHub

Ready to build an
unbreakable audit trail?

Request a pilot API key and a 15-minute integration demo. Most teams are live within a day.

Get started free Book a demo