Signatures that prove themselves.
Send, sign and keep contracts. Every signer confirms who they are with the account they already have, at no extra cost. Every signed PDF can be checked by anyone, even without us.
- Signed by
- Claire Martin
- Verified with Microsoft, work account
- Signed by
- Dan Okafor
- Verified with Google
- Prepared by
- Maya Chen
- Verified with Google
Checked on this device. The file was not uploaded.
Pricing
Prices per month, billed yearly, in US dollars excluding tax. Month to month costs a little more.
No subscription? Envelope packs: 1 for $3 or 5 for $10. They never expire.
What makes Sovrasign different
Six principles, and how you can check each one.
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The PDF is the evidence
Every signed PDF carries who signed, how each person confirmed who they are, and a signed record of every step. Anyone can check it, even without us.
How we show it: Drop a signed PDF into the free verifier. It shows who signed and whether anything changed, without uploading the file.
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Know who signed. No extra charge.
Signers confirm who they are with the account they already have. We pick the Google, Microsoft or Apple account their email belongs to, otherwise a one-time email code. The sender sets nothing up.
How we show it: The PDF records how each signer was verified, for example: Verified with Microsoft: claire@example.com.
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Clear limits. No traps.
Public prices, shown per month. Allowances stated as numbers. Prepaid blocks instead of overage bills. Cancel in two clicks. Reminders before every yearly renewal.
How we show it: The billing rules are set out in plain words on the pricing page.
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Coming
Choose how private
Private envelopes that we cannot read, and apps that prepare, sign and check documents offline, with no server at all.
How we show it: A lock badge and a plain explanation on every private envelope.
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Open verifier. Open format.
The verifier and the description of the document format are open source (MIT or Apache-2.0), with test vectors, so anyone can check our work.
How we show it: Sovrasign Verify runs on the open signing engine behind Sovrasign.
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Coming
Understand what you sign
Plain-language summaries for senders and signers, key dates and renewal alerts, and risk checks, at small-business prices. Labeled as AI, and never trained on your documents.
How we show it: Signers of envelopes sent from a paid plan get an “explain this” button.
How it works
Send
Upload a PDF, add the people who sign, place the fields, send. Each person gets an email with their own link.
Sign with a verified identity
Signers open the link, confirm who they are with Google, Microsoft, Apple or a code sent to their email, and sign in the browser. No account needed, and signing is always free.
Keep a PDF that proves itself
Everyone receives the signed PDF. It holds the signatures, the verified identities and the record of each step. Check it anywhere, at any time.
Trust you can check
Most e-signature services keep the evidence on their own servers. Sovrasign puts it inside the PDF. Each signature is made in the signer's browser with a key used once and then thrown away, and a Google, Microsoft or Apple identity is vouched for by Google, Microsoft or Apple, not by us.
So even someone who took over our servers could not forge a signature on a document already signed, or change one without the verifier noticing.
Verify signed documents
The verifier runs in your browser. Your file never leaves your device. Free, with no account.
Be among the first to use it
We invite people from the waitlist to a small private beta, in the order they joined. We only email you about the beta and the launch.