How to do digital signature in PDF online

TL;DR

signNow enables secure, ESIGN- and UETA-compliant eSignatures for PDFs online via web, mobile, and API. Users can upload PDFs, add fillable fields, send for signature, track a full audit trail, and store completed files securely with AES-256 encryption and SOC 2 controls.

What online PDF digital signing is

Doing a digital signature in a PDF online means adding an electronic signature to a PDF so it is legally binding and stored securely without printing. signNow provides tools to upload a PDF, place signature and input fields, request signatures by email or link, and capture a tamper-evident audit trail that records signer identity and timestamps, making remote document workflows fast, auditable, and compatible with common U.S. electronic signature laws like ESIGN and UETA.

Step-by-step PDF eSignature process

Follow these clear steps in signNow to convert a PDF into a signed, managed document from upload through secure storage.

• 01
  Upload Your Document: Open signNow, choose Upload, select the PDF file from your computer or cloud storage.
• 02
  Add Fields: Open the document editor, select Signature and Text fields, and place them where needed.
• 03
  Send for Signing: Use Send for Signature, enter signer emails, set signing order and authentication methods.
• 04
  Manage Completed File: Download or save to cloud, review the audit trail, and apply retention or sharing controls.

Where and how to sign PDFs

Use the web app for full document editing, the mobile app for on-the-go signing, and the API for automated sending, integrating with CRMs, ERPs, or document stores to embed eSignature workflows into business systems.

• Web Browsers: Chrome, Edge, Safari
• Mobile Apps: iOS and Android
• API Access: REST API available

Legal validity and business timing

signNow follows ESIGN and UETA so signed PDFs are legally defensible in the U.S. Use signNow when closing remote sales contracts or collecting employee onboarding signatures at scale; it also suits HIPAA-protected workflows when a BAA is in place.

Security, encryption, and compliance

In-transit Encryption: TLS 1.2 and TLS 1.3

At-rest Encryption: AES-256 encryption

SOC and ISO: SOC 2 Type II and ISO 27001

HIPAA Support: BAA required for PHI

eSignature Laws: ESIGN and UETA compliant

Accessibility: WCAG 2.0 Level AA

Preparing and sending a PDF to sign

A simple flow turns a static PDF into a signed document: upload, add fields, send, and finalize with audit records for compliance and storage.

• Upload: Import PDF from device or cloud
• Prepare Fields: Drag signature, initials, and text fields
• Send for Signature: Enter signer emails or create a signing link
• Finalize and Store: Collect signatures, view audit trail, save securely

Core features for signing PDFs online

Key signNow capabilities that enable secure, repeatable PDF signing workflows and reduce manual tasks while preserving legal proof of signature.

Fill and Sign

Create fillable PDFs with signature, initials, and text fields for each signer; completed documents include timestamps and tamper-evident seals to support legal validity and auditability.

Bulk Send

Send a single PDF to many recipients at once using bulk send for mass forms or agreements; available on Business Premium to streamline high-volume signature requests and reduce administrative time.

Audit Trail

Each signed PDF includes a detailed audit trail recording signer email, IP address, timestamps, and actions to provide an evidentiary record for compliance and dispute resolution.

Integrations

Connect signNow with cloud storage and business systems such as Google Drive, Salesforce, and NetSuite to automate document flow and persist signed PDFs in existing repositories.

Advanced PDF signing capabilities

Additional features support enterprise use cases: advanced authentication, conditional fields, API access, payments, offline signing, and mobile-first workflows.

Advanced Authentication

Support for SMS, knowledge-based, and two-factor authentication to increase signer confidence for sensitive PDFs and regulated scenarios.

Conditional Fields

Show or hide fields based on input values so PDF forms adapt to responses and reduce signer errors during form completion.

Payments Integration

Collect payments during signing on Enterprise plans to combine acceptance and payment into a single PDF workflow when required.

Mobile and Offline

Native iOS and Android apps support field completion and offline signing to capture approvals without constant connectivity.

API and Automation

Comprehensive REST API enables automated PDF upload, field placement, and send-for-signature processes integrated in CRMs and ERPs.

Template Library

Create reusable PDF templates to speed common forms and maintain consistent field placement across recurring documents.

Recommended workflow settings for PDFs

Default settings below suit common PDF signing workflows while balancing security, signer convenience, and retention requirements.

Setting Name	Default Configuration
Signer Authentication Method	Email + SMS
Reminder Frequency	48 hours
Document Expiration	30 days
Audit Trail Retention	Indefinite
Template Library Access	Enabled

Pricing snapshot and feature comparison

Data current as of May 2026. The table compares starting price, trials, bulk send availability, audit trail presence, HIPAA support, and envelope caps across signNow and major competitors.

	signNow	DocuSign	Adobe Sign	PandaDoc	HelloSign
Starting Price	$8/user/mo	$8/user/mo	$13/user/mo	$19/user/mo	$15/user/mo
Free Trial	7-day free trial	Free trial avail.	Free trial avail.	Free trial avail.	Free trial avail.
Bulk Send	Yes, Business Premium	Yes, on select plans	Yes	Yes	Limited bulk send
Audit Trail	Yes, full audit trail	Yes	Yes	Yes	Yes
HIPAA Compliant	Yes, BAA required	Varies by plan	Varies by plan	Varies by plan	Varies by plan
Envelope Cap	No envelope cap	100 envelopes/user/year	No public cap	No public cap	No public cap

Real-world PDF signing examples

Short examples illustrate how teams use signNow to sign PDFs online across industries and integration scenarios.

Optica Ventures — Faster customer signoff

Brian Fitzgibbons, COO, reports simple interface and easy customer use

• Uses online PDF uploads and prebuilt fields for investor and client agreements
• Customers complete and return forms faster, reducing chase time

Resulting in faster deal progression and higher client satisfaction with fewer in-person steps.

Xerox — Integrated PDF signing with NetSuite

Kodi-Marie Evans, Director of NetSuite Operations, highlights integration benefits

• signNow connects with NetSuite to auto-populate PDF fields and trigger sends
• This cuts manual entry and speeds approvals across procurement and vendor agreements

Leading to streamlined operations and fewer document-handling errors across teams.

FAQs and common issues with PDF eSigning

Typical questions and fixes when preparing, sending, or receiving PDFs for eSignature with signNow, covering upload, delivery, compliance, and API errors.

• Unable to upload a PDF file
  Check file size and format; signNow accepts standard PDF files. If upload fails, try a supported browser or the mobile app, clear cache, or re-export the PDF from your source application, then retry the upload.
• Signer did not receive the email
  Ask the signer to check spam folders and confirm the email address spelling. Resend the signing link from the document's Manage page, or provide a public signing link when appropriate for faster access.
• Need HIPAA compliance for health forms
  To process PHI, ensure your account has an executed BAA with signNow. Configure strict signer authentication and retention settings to meet HIPAA administrative and technical safeguard requirements.
• Bulk send jobs failing or incomplete
  Confirm CSV formatting and required fields match template fields. Use the Business Premium bulk send tool and validate sample rows before full deployment to prevent partial failures.
• API authentication or token errors
  Verify API keys and OAuth credentials, confirm proper scopes, and ensure your account has API access enabled. Rotate keys safely and check rate limits when automating large volumes.
• Questions about the document audit trail
  Open the completed document and view the Audit Trail to see timestamps, signer emails, IP addresses, and actions. Export the trail for legal or compliance review if needed.

Best practices for signing PDFs online

Adopt policies and controls that make electronic PDF signing consistent, secure, and easy to audit across teams.

Use templates for recurring PDFs

Create and lock templates for frequently used PDFs to ensure fields are consistent and reduce preparation time while minimizing signer errors across repeated document types.

Require signer authentication methods

Select SMS or two-factor authentication for high-value or sensitive PDFs to strengthen signer identity verification and increase evidentiary weight of the signed file.

Set reminders and expirations

Configure automated reminders and expirations to keep signature processes moving, reduce stale requests, and maintain timely record-keeping for document lifecycle control.

Preserve and export audit trails

Always save completed PDFs with their audit trails to secure storage and export trails for compliance reviews, litigation readiness, or internal record retention policies.

Who signs PDFs online with signNow

Organizations adopt signNow for faster turnaround, clear auditability, and flexible integrations that let business users and IT teams manage PDF signing across systems.

• Real Estate teams signing leases and disclosure PDFs while remote or on site.
• Healthcare providers collecting patient consents and intake forms with HIPAA controls.
• Finance and legal groups executing contracts, tax forms, and approvals with audit trails.