In the past, client intake involved extensive paperwork, long queues, and frequent errors. This traditional method disappointed customers and delayed the customer onboarding process. Today, clients expect an uninterrupted digital client intake experience that is fast, authentic, and accessible. Trusting outdated methods can damage belief and reduce conversions.
A slow or complex signature process adds conflict at a critical stage. Clients expect convenience and speed, particularly during the client onboarding process. Without the right tools, businesses risk losing faith and missing important opportunities.s
According to a report by Statista, the global electronic signature verification market was valued at 957 million US dollars in 2019. It is projected to grow to 4.8 billion by 2026, showing how major e-signature solutions it is becoming across industries.
In this blog, we explore the top 21 e-signature APIs that help streamline digital onboarding. These tools make client intake faster, more secure, and more efficient, helping your business deliver a smooth experience from the first interaction. Explore our client intake software guide to learn how modern tools can further optimize your intake process.
Top 21 E-Signature APIs to Use for Digital Onboarding
1. SignNow
Key Features
- This API grafts signing and sending with smart pre-filling and real-time webhooks.
- SignNow supports document uploading, reusable templates, bulk invites, and role-based signing.
- This e-signature API supervises documents, templates, and users, with webhook support.
- This provides audit trail tracking and industry regulation-ready (HIPAA, SOC-2, GDPR) at the Enterprise level.
Pros
- This cost-effective full-featured solution with advanced field logic and bulk sending.
- This API provides developer-friendly webhook integration.
- This e-sign API supports strong compliance and security standards.
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Cons
- Document signing API provides advanced features that require higher-tier plans and setup time.
- Enterprise pricing may not suit infrequent users.
Pricing
- Free Trial: 250 signature invites, full feature access, no charge until used, includes $500 value risk-free.
- Professional Plan: $146/month (annual billing), includes 1000 signature invites/year, embedded signing, legal eSignatures, and unlimited apps.
- Enterprise+ Plan: Custom volume pricing, nonprofit discounts, custom development, and implementation support (contact sales).
2. DocuSign
Key Features
- DocuSign provides unlimited e-signatures with branding, upgraded workflows, and transaction history.
- This document signing API supports two-factor authentication and powerful compliance features.
- This e-sign API supports native connectors for Salesforce, Microsoft, Google, and ERP systems.
- This integration allows advanced team management and role assignments.
Pros
- This electronic signature API is highly scalable for large enterprises.
- This trusted API compliance suite provides detailed audit logs and security controls.
- DocuSign supports an extensive integration ecosystem and global reach.
Cons
- These core features require mid to high-tier plans for full functionality.
- Some modules require separate add-ons at extra cost.
Pricing
- Personal plan around $15 per user per month for a small number of envelopes.
- Standard plan from $45 per user per month with expanded usage.
- Business Pro is around $65 per month for advancement.
- API Starter plan starts at $50 monthly for signature volume; scalable enterprise pricing is available.
3. Adobe Acrobat Sign
Key Features
- Adobe Acrobat Sign provides web-based and mobile signing with recyclable templates.
- This electronic API helps with role-based signing and conditional approvals.
- Audit trail and in-depth compliance reporting with this document signing API.
Pros
- This best e-signature API helps a strong brand trust backed by Adobe reliability.
- This digital signature API Scales well in document-rich and enterprise environments.
- This integration allows PDF workflows and document management.
Cons
- This electronic API can be more costly than for smaller organizations.
- This document signing API features, like dynamic forms, may require Adobe ecosystem familiarity.
Pricing
- Acrobat Standard is available for single users at $12.99 per month.
- Acrobat Pro is priced at $19.99 per month for a single user.
- Acrobat Standard for teams charges $14.99 per month per license.
- Acrobat Pro for teams is priced at $23.99 per license per month.
4. DropboxSign
Key Features
- Dropbox provides a simple embedded e-signing experience with reusable templates.
- This electronic API supports document generation, signature requests, and webhook triggers.
- This digital signature API supports third-party integrations with Dropbox, Google Workspace, Salesforce, and Zapier.
- This e-signature API helps with Audit trail, signer authentication, and data encryption.
Pros
- This is easy to use and integrates smoothly with Dropbox.
- This document signing API is a clean and intuitive interface perfect for SMBs.
- This e-sign API provides transparent per-signature pricing that allows cost control.
Cons
- This digital signature API lacks advanced enterprise capabilities like conditional logic.
- This e-signature API provides a smaller feature set compared to larger platforms.
Pricing
- This digital signature API offers a standard plan at $15 per month.
- This electronic signature API supports the premium plan, $25 per user per month, and includes advanced features.
- API-based plans are available based on the number of signatures or as a quantity-based subscription.
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5. RightSignature
Key Features
- This digital signature API supports reusable templates with branding and advanced field options.
- RightSignature provides upload documents, easy drag-and-drop field placement, and role-based signing.
- This electronic signature API helps with third-party integrations with Salesforce, Google Drive, and Zapier.
- This document signing API provides secure SSL encryption and audit trails.
Pros
- This e-sign API is a simple, straightforward interface with essential e-signature features.
- This e-signature API is cost-effective for small teams.
Cons
- This e-signature API lacks some advanced automation and enterprise capabilities.
- This electronic signature API offers limited customization compared to larger platforms.
Pricing
Monthly Plans:
- RightSignature offers an advanced plan that costs $17.60 per month with a minimum of 3 users.
- RightSignature offers a premium plan priced at $27.50 per month with a minimum of 3 users.
- The Industry Advantage plan is available at $45.83 per month with a minimum of 3 users.
- The Virtual Data Room plan costs $75 monthly with a minimum of 5 users.
Yearly Plans:
- The Advanced plan is $16 per month with a minimum of 3 users annually.
- The Premium plan costs $25 per month with a minimum of 3 users annually.
- The Industry Advantage plan is priced at $41.67 per month with a minimum of 3 users annually.
- The Virtual Data Room plan costs $67.50 per month with a minimum of 5 users annually.
6. OneSpan Sign
Key Features
- OneSpan offers enterprise-level signing with multi-factor authentication, transaction history, and industrial regulations.
- This digital signature API supports advanced workflows, inserted signatures, and mobile signing.
- This document signing API boosts security with certificate-based and knowledge-based subscriber authentication.
Pros
- This electronic signature API supports strong security and industrial regulations (e.g., eIDAS, FDA, FINRA).
- This document signing API is suitable for large regulated organizations.
- This e-signature API offers a customizable and developer-friendly interface.
Cons
- This Premium pricing is suitable for businesses only.
- This digital signature provides complex onboarding for smaller teams.
Pricing
- OneSpan provides volume-based pricing that is only customized per usage and deployment size.
7. ZohoSign
Key Features
- Zoho Sign includes signing, template reuse, signer, and field assignments.
- This document signing API integrates naturally with Zoho CRM, Docs, and other apps.
- This e-signature API provides access to document and user management.
- This electronic signature API supports audit trail, SSL encryption, and two-factor signer authentication.
Pros
- This digital signature API supports uninterrupted integration for Zoho platform users.
- This e-sign API offers Competitive pricing with strong value for SMBs.
Cons
- This digital signature API is less powerful than enterprise grants.
- This e-signature API lacks some advanced workflow and conditional logic features.
Pricing
Monthly Plans:
- Zoho Sign offers a Free plan with basic features.
- The Standard plan is priced at INR 800 per month.
- The Professional plan costs INR 1,200 per month.
- The Enterprise plan is available at INR 1,600 per month.
Yearly Plans (Billed Annually):
- The Free plan is available at INR 0 with limited features.
- The Standard plan costs INR 650 per month annually.
- The Professional plan is priced at INR 1,000 per month annually.
- The Enterprise plan costs INR 1,300 per month annually.
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8. PandaDoc
Key Features
- This electronic signature supports conditional content and calculations that support dynamic documents.
- This digital signature API provides version control and an audit trail for all document edits and signings.
- This document signing API supports real-time notifications when recipients open, review, comment, or sign.
- This e-signature API follows workflow analytics and reporting to track document performance and bottlenecks.
Pros
- This e-sign API allows an all-in-one document workflow with CRM integrations and advanced automation.
- This electronic signature API follows a developer-friendly API, sandbox testing, and complete documentation.
- This digital signature API provides strong security and enterprise-grade compliance.
Cons
- This API access and advanced features are available only in business-tier plans.
- This document signing API pricing may be steep for small teams.
Pricing
Monthly Plans:
- The Starter plan costs USD 35 per seat per month.
- The Business plan is priced at $65 per month.
- The Enterprise plan offers custom pricing per document and requires direct consultation.
Yearly Plans (Billed Annually):
- The Starter plan is available at USD 19 per month annually.
- The Business plan costs $49 per month annually.
- The Enterprise plan offers flexible pricing per seat or document and is available upon request.
9. DigiSigner
Key Features
- DigiSigner allows secure, authentic eSignatures with tamper-resistant seals and punched-in audit logs.
- This e-signature API supports multi-signer workflows, custom notifications, and document signing.
- This digital signature API includes in-document field validation (dates, checkboxes, initials) for data accuracy.
- This e-sign API offers Email and SMS sign authentication options to enhance signer verification.
Pros
- This digital signature API provides a Free tier for occasional use.
- Intuitive interface with strong compliance measures with DigiSigner.
Cons
- This e-signature API requires a Pro or Team plan plus pay-per-use credits.
- Enterprise features require custom pricing.
Pricing
Monthly Plans:
- The Free plan is available at no cost.
- The Pro plan costs $20 per month.
- The Team plan is priced at $50 for a single user monthly.
- The Enterprise plan offers custom features and pricing.
Annual Plans (Billed Annually):
- The Free plan remains at $0.
- The Pro plan costs $12 per month annually.
- The Team plan is available at $40 per month with annual billing.
- The Enterprise plan includes custom pricing and features.
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10. Concord
Key Features
- Concord supports Complete contract lifecycle automation with clause libraries, risk metadata, and role-based permissions.
- This e-signature API provides contract templates that support metadata, versioning, milestone tracking, and renewal reminders.
- This digital signature API helps collaborative negotiation tools with threaded comments, redline comparisons, and approval workflows.
- This electronic signature API supports dashboard metrics for contract volume, cycle time, renewal pipeline, and value-at-risk.
- This audit log captures all contract interactions like views, edits, signatures, and exports.
Pros
- This digital signature API is designed for the full contract lifecycle.
- This e-signature API provides strong collaboration tools with cloud-based dashboards.
Cons
- This electronic signature is limited to contract management, not a general signature tool.
- This document signing API provides an enterprise-focused pricing model
Pricing
- The Essentials plan is priced at $399 per month, charged yearly.
- The business Plan is priced at $699 monthly and charged annually.
- The Enterprise plan provides customized pricing.
11. PDF.co
Key Features
- PDF.co provides a powerful PDF API: generation, merge, split, conversion (PDF to Word, Excel, HTML, images), and OCR.
- This e-signature API automates the filling of PDF forms using JSON or template data inputs.
- This digital signature API supports barcode and QR code generation inserted into PDF documents.
- This electronic signature API data extraction with OCR for scanned documents, tables, and structured data.
- This document signing API supports RESTful API endpoints accessible in any language, with SDKs for JavaScript, PHP, Python, and more.
- This e-sign API supports a webhook for task completion notifications and workflow triggers.
Pros
- All-in-one document handling via this e-signature API
- This document signing API supports strong data extraction and processing
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Cons
- This API is focused on PDFs, not a full e-signature suite.
- This digital signature API requires coding knowledge for API use.
Pricing
- This document signing API provides a pay-as-you-go credit model with monthly subscription options.
- Free tier available for low-volume use.
12. Rocket Lawyer Sign
Key Features
- E-signature integration with Rocket Lawyer’s extensive template library.
- This e-signature API supports document assembly and pre-fills legal forms based on user input.
- This document signing API offers a built-in audit trail including IP address, timestamps, and signer identity verification.
- This electronic signature API is stored and organized by Rocket Lawyer’s secure cloud environment.
- Rocket Lawyer Sign integration with Clio and QuickBooks for legal practice management.
Pros
- Firms using Rocket Lawyer’s legal forms and documents conveniently.
- This e-sign API offers flat-fee pricing, making it easy to budget.
Cons
- This API is limited to the Rocket Lawyer natural system.
- This e-signature API lacks advanced workflow automation.
Pricing
- This Interactions subscription includes monthly and yearly plans.
- eSignature per document is available at lower volume fees.
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13. Signable
Key Features
- This e-signature API offers a fast setup for sending documents via email or SMS links with a few clicks.
- This digital signature API provides role-based signature control for multi-party signing.
- This document signing API allows audit reporting with signer IP, timestamps, and status tracking.
- This electronic signature API includes bulk sending and team management dashboards.
- This e-sign API is a simple, developer-friendly REST API for fixing signing flows.
Pros
- Signable is simple and affordable for United Kingdom and European Union users.
- This digital signature API allows transparent per-signature pricing.
Cons
- This electronic signature API offers limited eSignatures without full contract lifecycle tools.
- This API provides smaller ecosystem integrations.
Pricing
Monthly Plans:
- PAYG is priced at $1.50 per envelope with no monthly commitment.
- Small Plan costs $40 per month.
- Medium Plan is available at $90 per month.
- Large Plan priced at $220 per month.
- Corporate Plan costs $380 per month.
Annual Plans:
- PAYG remains at $1.50 per envelope on a pay-as-you-go basis.
- Small Plan billed at $440 per year.
- Medium Plan is available at $990 per year.
- Large Plan priced at $2,420 per year.
- The Corporate Plan is available for $4,180 per year.
14.Foxit E-Sign
Key Features
- Foxit eSign provides core electronic signature features, including signing, reusable templates, offline signing, and individual capabilities.
- This digital signature API offers drag-and-drop field placement and document tagging.
- This electronic signature API grants Workflow automation, including auto-reminders, expiry dates, and signer notifications.
- This API provides webhooks to notify external systems when documents are signed or upgraded.
- This API permits audit trails to track every action with IP, time indicators, and field-level modifications.
- This e-signature integration provides multi-language support for global usage.
Pros
- This document signing API is a cost-effective alternative with essential features.
- This API allows strong document management and templates for recycling.
Cons
- This document signing API allows fewer enterprise-grade features compared to larger platforms.
- Foxit e-sign provides advanced API features at higher plans.
Pricing
- eSign Essentials is priced at INR 10,410.64 per year.
- eSign Business is available at INR 26,026.60 per year.
15. Xodo Sign (Eversign)
Key Features
- Xodo Sign allows eSignatures with reusable templates, role-based, and in-person signing.
- This e-signature API permits the document editor to support annotations, form fields, and text insertion.
- This integration workflow automation includes reminders, expiration dates, and audit logs.
- This electronic signature API is a Developer API with a sandbox environment, webhooks, and endpoint documentation.
- Xodo easily follows industrial standards.
Pros
- This document signing API has document customization and field-level accuracy.
- This integration provides easy onboarding with a clear UI and multilingual support.
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Cons
- In this integration, advanced automation is limited compared to enterprise solutions.
- This API provides different customer service responsiveness depending on the plan.
Pricing
- The free tier allows 5 documents per month.
- Xodo sign subscription includes monthly and yearly plans.
16. SignRequest
Key Features
- This API integrates via API and Zapier with Google Workspace, Salesforce, and Microsoft 365.
- This digital signature API allows audit trail, signer authentication, and SSL encryption.
- This electronic signature API provides document templates, branding options, and bulk send.
- This integration supports Webhook for document status updates.
Pros
- This electronic signature API grants a clean, user-friendly interface ideal for small and mid-sized firms.
- This API provides a clear signature pricing model.
Cons
- This e-signature API provides even more advanced automated workflows for enterprise platforms.
Pricing
- Professional Plan includes a free trial priced at €9 per month for a single user.
- The Business Plan consists of a free trial priced at €15 per month for a person.
17. Lightico
Key Features
- Lightico is a Mobile-first customer interaction platform built for real-time proof of identity, completion, and eSignature.
- This electronic signature API guides digital workflows with document capture, form filling, and payments integrated into the process.
- This integration provides biometric authentication and ID verification services.
- This digital signature API is a Real-time tracking dashboard for session analytics and drop-off rates.
Pros
- This API is ideal for a mobile client that provides journeys and identity verification.
- This document signing API combines document signing, payments, and verification in one flow.
- This API is excellent for regulated industries like financial services and insurance.
Cons
- This digital signature API provides Premium pricing for enterprises and high-volume use cases.
- This API allows Setup and integration for technical expertise.
Pricing
- This integration provides custom enterprise pricing based on deployment features and volume.
18. Box Sign
Key Features
- This integration was built in Box for secure document signing inside the Box content cloud.
- Box Sign provides simple signature workflows, templates, and signer assignment features.
- This document signing API allows Full audit trails, drag-and-drop fields, and signer workflows.
- This API is accessed through the Box Developer Platform.
Pros
- This API permits a seamless experience for existing Box users with synchronized content.
- This electronic signature API allows centralized document management and file access.
Cons
- This e-signature API focuses on document signing, not full contract lifecycle automation.
- This integration outside of the Box ecosystem may require extra development.
Pricing
- This e-sign API includes the Box Enterprise plan.
- In this API add-on, pricing may vary by region and deployment specifics.
19. GetAccept
Key Features
- GetAccept is a sales-focused electronic signing platform with real-time communication analytics.
- This digital signature API provides video, chat, and live call features within documents.
- This integration allows document monitoring, reminders, negotiating tools, and templates.
- This document signing API offers electronic signatures, payments via Stripe, and a post-signing engagement measure.
Pros
- This API integration is great for sales teams that value personalization and interaction.
- This API provides a connection for signing with live engagement and insights.
- This electronic signature API grants strong CRM integration and visibility pipelines.
Cons
- This integration is used for added collaboration features that may overwhelm simpler signing needs.
- These advanced interaction tools require premium plans.
Pricing
- This integration provides a basic plan that starts at $25 per user per month.
- Business and Enterprise plans are available with custom pricing and upgraded features.
20. Formstack Sign
Key Features
- This document signing API allows role-based signing, expiration reminders, and document routing workflows.
- This integration allows audit trails, signer authentication, and SSL encryption for security.
- This API integration is available via API, Zapier, Salesforce, and Payment portals.
- This digital signature API includes bulk send capabilities and team management features.
Pros
- This electronic signature API is designed for simplicity and fast setup.
- This integration provides excellent integration support with CRMs and workflow tools.
- This document signing API allows a no-code approach, making it accessible for non-technical teams.
Cons
- This e-signature API may lack granular enterprise-level automation features.
Pricing
- This integration provides individuals and small teams with pricing around $30 per month for a particular user.
- Additional tiers include bulk sending, Salesforce integration, and API access.
- This electronic signature API allows custom enterprise pricing based on feature needs.
21. DottedSign
Key Features
- This integration allows a mobile-optimized interface for quick and flexible signing.
- This digital signing API allows drag-and-drop templates, in-person sign options, and notifications.
- This API document audits logs including eIDAS and ISO compliance.
- This integrates via API and Zapier with Box, Google Drive, and Dropbox.
- Team and role management for streamlined workflows with DottedSign API.
Pros
- This electronic signature API is ideal for teams focused on mobile-first signing.
- This API includes a GDPR and ISO-compliant security foundation.
Cons
- This document signing API grants fewer advanced workflow upgradation options.
- This API provides limited analytics and reporting compared to enterprise tools.
Pricing
- This integration allows the free plan with limited signatures per month.
- This API provides a standard plan that starts around $9 per month for individual users with core features.
- This API includes business plans priced for a single user per month, with team features.
Conclusion
If your business faces delays in signing documents, slow client onboarding, or disconnected approval processes, it’s time to take action. Spending on the best e-signature API can change your client’s onboarding process into a smooth and secure experience. These APIs do more than collect signatures. They speed up decision-making, improve industry regulations, and help you create a professional first impression for clients and partners.
At APITech, we specialize in building customized e-signature API integrations that match your business goals. Whether you are looking for an upgrade to document flows, allowing secure digital signing, or connecting your e-signature process with customer relationship management or onboarding systems, our team ensures a reliable and efficient setup.
Let your team focus on growth while we simplify your document signing experience.
FAQ– Top 21 E-Signature APIs to Use for Digital Onboarding
1. Which electrical signature API is best for small businesses?
We provide some API integration for small businesses like HelloSign, SignRequest, and Adobe Acrobat Sign offers user-friendly interfaces, affordable pricing, and adaptable options ideal for small businesses.
2. How secure are e-signature APIs?
This blog provides insights into top e-signature APIs that use strong encryption, audit trails, access controls, and secure storage to protect your documents and ensure data integrity.
3. Can I customize the signing experience using these APIs?
Most APIs allow branded signing experiences, custom workflows, templates, and notification systems to match your business needs.
4. How do I choose the best e-signature API for my business?
Businesses follow industry requirements for selecting the best e-signature API. If you're doubtful about your business requirements, contact our experts, who will guide you based on your business.
