Electronic signature features, from first draft to sealed copy
Build the document, decide who signs and in what order, send one link — and keep a copy that can still be proven years from now.
No account needed to sign
Your recipient gets a link, opens the document, and signs. No sign-up, no password, no app to download. They're done in under a minute.
- One link to open, review, and sign
- Works on any device — desktop, tablet, phone
- No downloads or apps required
Both parties get a copy
Once signed, both you and the signer automatically receive an identical, verified copy of the document. No chasing, no follow-ups.
- Instant delivery to both parties
- Identical verified copies — no discrepancies
- Download anytime from your dashboard
Protected by cryptography
Every signed document is sealed with a unique SHA-256 hash. If even a single character is changed after signing, the seal breaks and the tampering is immediately detected.
- SHA-256 cryptographic seal on every document
- Any modification instantly breaks the seal
- Integrity is checked automatically — any change breaks the seal
Complete audit trail
Every action is logged — when the link was opened, when the document was viewed, and when it was signed. You always know exactly where things stand.
- Timestamped log of every event
- IP address and device info captured
- Exportable audit certificate for legal use
Build documents in the editor
Compose your document directly in CalmSign's block-based editor. Add headings, text, date and text inputs, and signature blocks — then send it out in seconds.
- Create documents from scratch in the block editor
- Add and reorder signature, text, date, heading, and divider blocks
- Or open a ready-made contract template and edit from there
Multiple signers, in the order you choose
A document can carry a signature block for each party, and each block belongs to a named signer. Set the order they sign in and CalmSign works through it one signer at a time, so the counter-signature always lands last.
- A signature block per signer, assigned while you build the document
- Each signer gets their own link — still no account required
- The document is finalized, and the seal computed, after the final signature
An audit certificate you can hand over
The audit trail is not just a screen in your dashboard. Export it as a single certificate that travels with the document: who signed, from where, at what second, and the SHA-256 seal the copy was finalized with.
- One export covering every event in the document's life
- Signer name and email, IP address, device, and UTC timestamps
- The seal printed alongside, so any copy can be re-checked against it
- Details of how the seal is computed are on the security page
API access
On the Business plan, the things you do in the dashboard are available over a REST API. Create a document, attach its signers, send it — and take a webhook the moment it is signed, carrying the document id and its SHA-256 seal.
{
"title": "Service Agreement",
"signers": [{ "email": "priya@acme.co" }]
}{
"id": "doc_a7x9k2m",
"sha256": "9f86d081884c7d65..."
}Ready to get started?
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