Document signing with proof that holds up.
ProofVault signs PDFs directly in your browser, appends an immutable verification footer, and hash-locks the result into an encrypted vault with a complete cryptographic audit trail.
Encrypted end to end
Files sit in a private vault; only you and invited parties can open them.
Full audit trail
Every upload, view, sign and lock is timestamped and recorded.
Tamper-evident hashes
SHA-256 chain of custody breaks the moment a file is altered.
UK-based, no third-party signing APIs
Signing runs in our own engine — your documents never leave the vault.
In-house signing engine
Draw with mouse, finger or stylus on an HTML5 canvas, or type a stylised signature. No third-party signing APIs involved.
Verification metadata
Every submission captures signer name, email, precise UTC timestamp, IP address and device user-agent.
Encrypted vault
Originals and signed copies live in a private, encrypted vault that only you can read.
Cryptographic audit trail
Uploaded → Viewed → Signed → Hash-Locked. Copyable SHA-256 values for legal chain-of-custody.
One vault, eight workflows.
Signing is where ProofVault starts. Secure file transfer, fillable forms, nine PDF tools, invoicing, return forms and purpose-built toolkits for online sellers and schools all share the same encrypted vault and audit trail.
eSignature
Multi-party signing with drag-and-drop fields, QR verification and hash-locked records.
See eSignature →Secure file transfer
Send large files on an expiring encrypted link, track every download, revoke instantly.
See file transfer →PDF tools
Merge, split, compress, rotate, watermark, number and password-protect — in your browser.
See PDF tools →Forms
Publish a fillable form link and collect responses with timestamp, IP and device metadata.
See forms →Invoices & receipts
Branded invoices with tax and line items, plus matching receipts and packing slips.
See invoicing →Return forms
A self-serve returns portal that issues RMA codes and tracks every request.
See return forms →For eCommerce
Order paperwork, returns, supplier agreements and digital delivery for online sellers.
See eCommerce →For education
Consent forms, enrolment packs and staff policy sign-off with inspection-ready records.
See education →Every signature, provably yours.
SHA-256 of the original file plus the signature payload creates a record that breaks the moment anything changes.
Start signing freeStart free. Unlock everything for £5 a month.
Free gives you document signing and secure file transfer with the full audit trail. Solo is £5 / month (£4 billed annually) and opens up forms, invoices, returns portals and the nine-tool PDF suite, plus unlimited documents, QR verification and bigger transfers. Business Team adds sequential multi-party routing and seats.
Free Forever
Essential signing and secure file transfer for light or casual use.
- Limit: Up to 3 documents / month
- In-house interactive canvas signatures
- Basic tags (Signature & Date only)
- File transfer: 3 active links, 200 MB each, up to 7-day expiry
Forms: published forms with basic question typesPDF tools: merge, split, compress, protect, rotate, delete pagesInvoices, receipts and packing slipsSelf-serve RMA returns portalOn-Document QR Code VerificationMulti-Party Sequential Signing
ProofVault Solo
Unlimited documents plus forms, invoicing, returns portals and the full PDF toolkit.
- UNLIMITED documents & storage
- On-Document QR Code Verification
- Full Dynamic Tagging: Custom fields, checkboxes, text inputs
- Unlimited file transfers: 2 GB per link, expiry up to 30 days, full download logs
- Unlimited forms with dropdowns, long text and file-style questions
- Core PDF tools: merge, split, compress, protect, rotate, delete pages
- Advanced PDF tools: watermark, page numbering, images to PDF
- Unlimited invoices in GBP, USD or EUR with receipts and packing slips
- Unlimited returns portals with RMA codes and status tracking
Multi-Party Sequential Order Routing
Business Team
Full suite for corporate, school and multi-signer workflows.
- Priority email support — replies within 4 hours on business days
- Sequential Multi-Party Routing: Set Signer A → Signer B order
- Multi-role permissions (Signer, Approver, CC)
- Shared team workspace & reusable templates
- File transfer: 5 GB per link, expiry up to 90 days
- Education pack: consent forms, enrolment packs and whole-team policy sign-off
- eCommerce pack: order invoices, packing slips, RMA returns and supplier agreements