Sign it once.
Verify it forever.
Send a contract, collect signatures, hand over a tamper-evident receipt. Every signed PDF ships with cryptographic proof anyone can verify — no app, no account, no enterprise tax.
Close deals in minutes, not days.
- < 2 min
- Average time to send a contract
- 0
- Apps to install for your signers
- 50 states
- Where signatures are legally valid
Every document is signed, sealed and delivered with verifiable cryptographic evidence.
Legally binding signatures.
Built for the rest of us
The numbers that matter when you're sending a few contracts a month — speed, evidence and a price that fits a one-person shop.
Median time from email to signature
From the second your signer opens the email to the moment the PDF is sealed.
Audit chain integrity rate
Across every envelope ever signed on SignBona since launch.
Apps your signers install
Email link, browser, done. Works on a 5-year-old Android.
To verify any signed PDF
Anyone with the link can confirm the document is intact and timestamped. No SignBona account, no fees, ever.
Every signature ships with all this
Cryptographic evidence, audit trail and public verification — included on every plan, by default.
Cryptographic evidence
PAdES BASELINE-T digital signature · X.509 certificate issued per signer · SHA-256 hash of every page · RFC 3161 timestamp from a trusted TSA
Tamper-evident audit trail
HMAC-SHA256 event chain · Append-only — no edits, no deletes · IP, user agent and timestamp per event · Automatic tamper detection
Public verification
Verify any signed PDF without an account · QR code embedded in the certificate · Direct verify link in the completion email · Automatic verdict: valid · tampered · incomplete
Final deliverables
Sealed PDF with embedded signatures · PDF certificate of completion · Full audit chain export (JSON) · Permanent access while your account is active
Signer experience
Email link — no app to install · One-time email OTP for identity check · Works on any phone or browser · Mobile-first signing flow
Legal coverage
ESIGN Act compliant (15 U.S.C. §7001+) · UETA across 50 states + DC · CCPA-aligned data handling · Same legal weight as wet ink
Frequently Asked Questions
Our team is on hand to answer your questions.
Drop us a line and we'll get back to you shortly.
Most e-signature tools are priced for legal departments. SignBona is for the rest of us — freelancers, solo founders and small businesses who just need a few contracts signed without paying for an enterprise seat.
Upload a PDF, drop a signature field, send. That's it. No app for your signer to install, no quotas counting against your team, no compliance dashboard you'll never open.
And every signature still ships with cryptographic proof, a tamper-proof audit trail and a public verification link — anyone can confirm the document is intact, from any browser, no account required.