Is PDF Verified legally binding?

Yes. PDF Verified signatures comply with the US ESIGN Act, UETA, EU eIDAS regulation, and equivalent eSignature laws in 190+ countries. Every signed document includes a cryptographic SHA-256 fingerprint and a complete audit trail with timestamps and signer hash chain — admissible in court.

How is PDF Verified different from DocuSign?

PDF Verified offers unlimited documents on the $15 Business plan with REST API included. DocuSign charges $40+/user for Business and gates the API behind a $720/month add-on. PDF Verified also includes unique features: public QR verification page on every signed PDF, eStamp designer, AI field auto-detection, and mobile-first signing without requiring an app.

Can I use PDF Verified without a subscription?

Yes. The pay-as-you-go option lets you sign or send one document or envelope for $1.50 without a monthly subscription. Monthly paid plans include a 7-day free trial.

Which file types can I sign with PDF Verified?

Upload PDF, DOCX, TXT, PNG or JPG files. Non-PDF formats are automatically converted to PDF on upload so signers always receive a clean signing-ready document.

How do recipients verify a signed document is authentic?

Every signed PDF includes a QR code on every page. Anyone — even without a PDF Verified account — can scan it to land on a public verification page showing the document status, completion date, SHA-256 fingerprint, and tamper-evidence proof.

Does PDF Verified work on mobile?

Yes — PDF Verified is mobile-first by design. The signing portal uses a native bottom-sheet pattern with touch-optimized canvas signing, sticky CTAs in the thumb zone, and 44px+ touch targets following Apple Human Interface Guidelines. No app download required.

Can I add a company stamp or seal to a document?

Yes. PDF Verified includes a stamp designer for company seals, official seals, approval stamps (APPROVED, PAID, RECEIVED), date stamps, and certified-true-copy marks. Place a stamp on any document like a signature field. On Business plans, the verified stamp library adds auto-incrementing serial numbers, locked metadata, workspace sharing, revocation, and a public QR verification link for every stamp applied.

How do I verify a stamp is genuine?

Each stamp PDF Verified applies mints a unique verification token at /verify-stamp/:token. Scan the stamp's QR code or open the link from the document's audit certificate to see the stamp's name, serial number, the document it was applied to, and whether it has been revoked — so anyone can confirm a company seal or approval stamp is authentic and current.

How do I verify a signature on a PDF is real?

Open the verification page at pdfverified.com/verify and scan the QR code on the signed PDF, paste the verification code, or upload the file. PDF Verified recomputes the document's SHA-256 fingerprint and compares it against the sealed value — if a single byte changed since signing, verification fails. You also see every signer, their timestamps, and the full tamper-evident audit trail. No account is required to verify.

How do I add a digital stamp to a PDF online?

Upload your PDF, open the editor, add a Stamp field, and pick a stamp from your library — a company seal, an APPROVED or PAID approval stamp, a date stamp, or a certified-true-copy mark. The stamp is baked into the sealed PDF with an optional auto-incrementing serial number and a QR code that links to its public verification page. No printer, ink pad, or scanner needed.

What is OTP (One-Time Password)?

A short numeric code sent via SMS, WhatsApp, or email that the signer enters to authenticate before signing.

A One-Time Password (OTP) is a 4-8 digit code sent to a signer through a separate channel (SMS, WhatsApp, email) that they must enter on the signing page to proceed. OTP authentication is a low-friction way to bind a signature to a verified communication channel: if the signer received the code at the email/phone the contract was sent to, they likely are who the contract names. PDF Verified supports OTP via email and WhatsApp for any document with the "Require OTP" flag enabled.

OTP vs KYC

OTP proves the signer controls the email/phone in the contract. KYC proves the signer is the named individual with a verified government ID. Use OTP for everyday contracts where channel-binding is sufficient; layer KYC on top for regulated or high-value transactions.

How PDF Verified generates and sends OTPs

When the signer clicks the sign link, PDF Verified generates a 6-digit code, hashes it, stores the hash, and sends the plaintext via Resend (email) or WhatsApp Business API. The code expires in 10 minutes. The signer enters it on the portal; PDF Verified hashes and compares. The plaintext is never stored.

OTP failure modes

SMS delivery can fail in low-coverage areas. WhatsApp requires the signer's phone to be active on the network. Email OTP is the most reliable globally. PDF Verified falls back to email when WhatsApp delivery fails for resilience.