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Esig API

Freemium#18 of 28 in Electronic Signature APIs

Esig API: A connector-friendly signing API with embedded workflows, webhooks, and templates. Ranked #18 of 28 in Electronic Signature APIs by our editors (7.9/10); pricing: Free plan; best for API-first signing with many business connections.

7.9/10Editor score

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Esig API7.9 Visit Esig API

At a glance

Editor score
7.9 / 10
Pricing
Free plan
Best for
API-first signing with many business connections
Free plan
Yes
Embedded signing
Yes
Facts checked
20 Sep 2026

Where it wins
- Embedded signing, REST endpoints, and lifecycle webhooks
- Templates, PowerForms, form fields, and conditional fields
- 11 integrations plus bulk sending to up to 50 recipients
Where it doesn't
- API access starts with Business Pro rather than Personal or Standard
- Personal allowance is shown as both 5 sends and 1 envelope per month
- Advanced capabilities such as SSO and AI Insights require Enterprise

Our verdict on Esig API

Esig API is an electronic-signature service built around REST endpoints for creating, sending, voiding, deleting, and tracking envelopes. It suits teams connecting agreement workflows to custom applications, portals, and business systems. Personal access tokens support API authentication, while embedded signing can run in an iframe or portal. The product also covers reusable templates, reminders, audit events, completion records, PowerForms, conditional fields, and optional government photo ID verification.

Its ecosystem fit is a central strength. Esig lists connections for Slack, Google, Outlook, HubSpot, Stripe, Notion, Dropbox, Salesforce, Zapier, Microsoft Teams, and QuickBooks. That gives teams several paths for connecting signatures with communication, customer management, payments, storage, automation, and accounting workflows. The API includes HTTPS lifecycle webhooks, making it suitable for applications that need status updates after signing events. Bulk sending supports up to 50 recipients, while PowerForms provide self-service signing links.

The plan structure determines how much of the platform is available. Personal includes eSignature, audit trail, reminders, and secure storage and access. Standard adds templates, bulk sending, form fields, identity verification, and reminders. Business Pro adds API access, webhooks, bulk sending, templates, PowerForms, and identity verification. Enterprise adds SSO, AI Insights, and custom send limits. The Personal allowance is presented as 5 sends per month in one offer and 1 envelope per month in the pricing table. Choose Esig API when embedded signing, integrations, and developer access matter; teams needing API functionality on the entry plans or advanced enterprise controls should compare alternatives.

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Esig API pricing

Plans Free planFreemium A usable free plan; paid tiers unlock the limits above. Prices checked 20 Sep 2026.

See plans on esig.ca

All 4 Esig API plans and prices →

Esig API fact sheet

Free plan	Yes
Paid from	Not verified
Embedded signing	Yes
Signer authentication	Id_verification
Webhooks	Yes
Templates	Yes
Signing order	Not verified
Bulk sending	Yes
Maximum signers	Not verified
Deployment	Cloud
Platforms	Web
Support	Email, Phone, Docs
Built for	Solo, Small business, Mid-market, Enterprise (editorial estimate)
Integrations	11 integrations: Slack, Google, Outlook, HubSpot, Stripe, Notion …
Pricing	Free plan (source)
Website	esig.ca
Facts checked	20 Sep 2026

Esig API integrations

Esig API lists 11 integrations on its own site.

Slack
Google
Outlook
HubSpot
Stripe
Notion
Dropbox
Salesforce
Zapier
Microsoft Teams
QuickBooks

Alternatives to Esig API

See all Esig API alternatives →

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Featured on iTechGuides

Esig API is listed in our Electronic Signature APIs directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update