Electronic signatures, done right — and free.

Yes. In the US, the ESIGN Act and UETA give electronic signatures the same legal effect as handwritten ones, and in the EU, eIDAS does the same across member states. A signature cannot be denied legal effect simply because it is electronic. tuyaform is designed to capture the four pillars courts look for, intent to sign, consent to do business electronically, attribution to the signer, and a retainable record, so your signed documents hold up. A small set of document types (such as wills and certain court or family-law documents) are excluded and should be handled on paper; see our legality page for details. This is general information, not legal advice.

Yes, tuyaform is free forever for unlimited signing. There is no per-document fee, no signature limit, and no credit card required. We make money from ads instead of subscriptions, which is what lets us keep core signing free for everyone rather than gating it behind a paywall.

Ads are lazy-loaded and shown below the fold, so they never get in the way of building or signing a document and never appear on the signed PDF itself. They are contextual and privacy-respecting, we do not read the contents of your documents to target ads, and we never sell or share your document data with advertisers. The ad revenue is simply what funds unlimited free signing instead of charging a subscription.

When signing is complete, we seal the final PDF and compute a SHA-256 cryptographic hash of it. If even one character of the document changes afterward, the hash no longer matches and the seal is broken, making any tampering immediately detectable. Every completed document also includes a Certificate of Completion and an audit trail so anyone can verify it has not been altered since it was signed.

Yes. You can add multiple signers to a single document and choose whether they sign in a set order (sequential) or all at once (parallel). Each signer gets their own unique, secure signing link, and the audit trail records each person's actions, view, consent, and signature, separately. Once everyone has signed, all parties receive the completed, sealed PDF.

No. Signers do not need to create an account or download anything. They receive a secure link, open the document in their browser on any device, and sign in a few clicks. Requiring no signup removes friction so your documents get signed faster, while email verification and optional access codes still tie each signature to the right person.

These are the three e-signature tiers defined by the EU's eIDAS regulation. A Simple Electronic Signature (SES) is the everyday e-signature most agreements use and is what tuyaform provides by default. An Advanced Electronic Signature (AES) adds stronger, uniquely-linked signer identification, which tuyaform can support with additional identity verification. A Qualified Electronic Signature (QES) carries the highest assurance and the legal equivalence of a handwritten signature in the EU, but it requires a qualified certificate from a Qualified Trust Service Provider (QTSP); tuyaform does not issue QES on its own.

We encrypt documents in transit with TLS 1.3 and at rest with AES-256, seal completed PDFs with a tamper-evident SHA-256 hash, and enforce least-privilege, role-based access so only you and your intended recipients can see a document. Records are backed up redundantly and we align our controls with SOC 2 and ISO 27001 practices. See our security page for the full list of measures and certifications.