Digital Signature in PDF with SignNow
Award-winning eSignature solution
What digital signatures in PDFs do
A digital signature in PDF is a cryptographic method for signing a PDF that helps prove who signed it and whether the file changed afterward. In U.S. business use, it combines signer identity, document integrity, and a time-stamped record of the transaction. SignNow supports this workflow with templates, signer authentication, audit trails, and tamper-evident records, so teams can send, sign, and store PDF documents with a clear record of activity under ESIGN and UETA.
Key features for PDF signing
SignNow combines signing, audit, access, and retention features that support PDF workflows across small teams, regulated departments, and larger organizations.
Mobile signing
Signers can complete PDF approvals on desktop or mobile, which helps teams reduce turnaround time and keep a clear record of who signed, when they signed, and what version they reviewed.
Reusable templates
Templates standardize repeat PDF workflows, so teams can reuse approved fields, routing, and signer roles. That reduces setup work, limits formatting mistakes, and helps keep contract language or intake forms consistent across departments.
Audit trail
Audit trails capture time-stamped activity for each signed PDF. The record supports legal review, internal audits, and compliance checks by documenting delivery, viewing, signing, and completion events in a single file history.
Access control
Role-based controls help separate administrators, senders, and signers. That makes it easier to limit access to contracts, HR forms, consent records, or health documents without losing visibility into document progress.
Compliance support
HIPAA, SOC 2 Type II, and ISO 27001 support align the platform with regulated U.S. business use. Those controls matter when PDFs contain PHI, financial data, or other sensitive records.
Pricing structure
The Business plan starts at $8/user/mo billed annually, with unlimited users on paid plans. That pricing structure can fit teams that need many internal users without adding separate seat costs for every signer.
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How the signing flow works
The signing flow is straightforward: prepare a PDF, route it to signers, capture signatures, and preserve the final record.
Upload: Upload the PDF and place signature fields where needed. Assign: Assign signers and set the signing order. Send: Send the document and collect signatures electronically. Archive: Store the completed PDF with its audit trail.
Signer authentication and certificates
PKI trust chain:
X.509 certificates:
SMS OTP:
ID verification:
Two-factor login:
Revocation checks:
Quick steps for PDF signing
Use a simple sequence to prepare, send, sign, and store a PDF in SignNow.
Add fields:
Upload your PDF and place the signature, initials, and date fields. Set routing:
Choose the signer order and routing rules. Send request:
Send the document by email or signing link. Save record:
Download the completed PDF and store the audit trail.
U.S. legal standing
A digital signature in PDF is legally recognized for most U.S. business transactions under ESIGN and UETA when the signer intends to sign and the record is attributable, preserved, and retrievable. It is generally admissible as evidence when paired with a reliable audit trail. Wills and certain court orders remain excluded.
Feature comparison at a glance
A short feature check helps compare key PDF signing capabilities, plan access, and compliance support across leading vendors.
| Features | SignNow | DocuSign | Adobe Acrobat Sign |
|---|---|---|---|
| Legally binding eSignatures | Recommended | Yes | Yes |
| Entry plan pricing | $8/user/mo | $15/user/mo | $14/user/mo |
| Audit trails included | Yes | Yes | Yes |
| HIPAA support | Yes | Yes | Yes |
| Envelope or request caps | No cap | Limit varies | Limit varies |
Recordkeeping and retention practices
Good retention and recordkeeping habits help preserve enforceability, audit readiness, and access control for signed PDFs.
Match retention to the rule
Export the audit trail
Use secure archival storage
Restrict document access
Pricing and plan features
Current verified pricing and feature highlights for major eSignature vendors help compare entry plans, trial access, and compliance coverage.
| Features | Plan / Feature | SignNow | DocuSign | Adobe Sign | PandaDoc | HelloSign |
|---|---|---|---|---|---|---|
| Starting price | $8/user/mo, annual billing | $15/user/mo, annual billing | $14/user/mo, annual billing | $19/user/mo, annual billing | $15/user/mo, annual billing | |
| Free trial | 7-day free trial | Not verified | Not verified | Not verified | Not verified | |
| Bulk send | Business Premium plan | Not verified | Not verified | Not verified | Not verified | |
| Audit trail | Included on paid plans | Included on paid plans | Included on paid plans | Included on paid plans | Included on paid plans | |
| HIPAA support | BAA required | BAA available | BAA available | Not verified | Not verified |
PDF signing timeframes
These stages outline the normal flow from document preparation through archival for a PDF signing request in SignNow.
Document preparation
Delivery to signers
Signer turnaround
Completion and archival
FAQ and troubleshooting
These answers cover signing errors, compliance checks, access issues, and record retention for PDF workflows in SignNow.
SignNow supports ESIGN and UETA-compliant eSignatures on paid plans, and the Business plan starts at $8/user/mo billed annually. If a PDF will not sign, confirm the file is not flattened or password-protected, then re-upload it. Audit trails and signer authentication help support enforceability.
HIPAA workflows require a BAA, unique user identification, access controls, and audit controls. SignNow’s compliance documentation notes HIPAA support with a BAA required. Keep protected health information in encrypted storage, and use tracked workflows so the signed PDF retains a verifiable record of activity.
For 21 CFR Part 11 workflows, use validated processes, two-component authentication, and timestamped audit trails. SignNow’s security and compliance features can support regulated document handling, but the process owner must also validate the system and preserve records according to the applicable predicate rule.
If the signed PDF needs stronger signer verification, enable two-factor authentication or ID verification where the workflow requires added assurance. SignNow supports controlled access and audit trails, which helps document who signed, when they signed, and how the document was delivered.
If a recipient cannot access the document, check the signing link, email address, and permissions assigned to the template or workflow. SignNow templates, delegated sending, and unlimited users on paid plans help teams route PDFs to the right signer without recreating the file.
For retention, keep the signed PDF and audit trail according to the governing rule for the record class. HIPAA-covered records require 6 years under 45 CFR 164.530(j)(2); other records may follow IRS, FINRA, or industry-specific retention rules.
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