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Best Electronic Signature APIs in 2026

  1. 1

    OpenSign

    Free plan Open source APILinuxMac+3

    Choose OpenSign if you need a free PDF signing plan, reusable templates, or self-hosting options.

    8.8 Free plan Visit site
  2. 2

    BoldSign

    by BoldSign
    Free plan AndroidAPIExtension+1

    BoldSign combines contract signing, templates, and audit trails with mobile and API options. Review the plan limits and billing display to find the right fit.

    7.6 Free plan · paid from $5/user/mo (annual) · 30-day trial Visit site
  3. 3

    Documenso

    Free plan APISelf-hostedWeb

    Documenso offers signature workflows through web, API, and self-hosted options, with templates and embedding features.

    7.4 Free plan · paid from $25/mo (annual) Visit site
  4. 4

    Dropbox Sign API

    Free plan AndroidAPIiPhone+1

    Dropbox Sign API combines embedded signature flows, reusable templates, and SDKs for six languages. The free options have request limits, and higher monthly volume requires a sales contact.

    7.4 From $75/mo Visit site
  5. 5

    Blueink eSignature API

    Free plan APIWeb
    7.3 From $90/mo (annual) · 14-day trial Visit site
  6. 6

    Document eSign API

    Free plan APIWeb
    7.2 From $20/mo · 14-day trial Visit site
  7. 7

    Esig API

    Free plan APIWeb
    7.1 Free plan Visit site
  8. 8

    eSignatures.com API

    Free plan APIWeb
    7.1 From $0.49 Visit site
  9. 9

    Sertifi by Flywire

    by Sertifi by Flywire
    Free plan AndroidAPIiPhone+1

    Travel companies looking for authorizations can start with the free plan.

    7.1 Pricing on request Visit site
  10. 10

    DocuSeal

    Free plan API

    DocuSeal offers several routes for document signing, from a limited free Basic tier to open-source and paid options.

    7.0 Free plan · paid from $20/user/mo Visit site
  11. 11

    DocuSign eSignature

    by DocuSign eSignature
    Free plan API

    DocuSign eSignature combines agreement workflows with signing, audit trails, and integrations. Compare the envelope limits and annual per-user prices with your expected volume before choosing a plan.

    7.0 Free plan · paid from $11/user/mo (annual) · 30-day trial Visit site
  12. 12

    Signeasy

    by Signeasy
    Free plan AndroidAPIiPhone+1

    Signeasy combines document signing with a searchable contract repository, integrations, and an API.

    7.0 Free plan · paid from $10/user/mo · 14-day trial Visit site
  13. 13

    Signority API

    by Signority API
    Free plan APISelf-hostedWeb+1

    Signority API offers a range of signing workflows, developer environments, and Canadian document hosting.

    7.0 Free plan · paid from $12/mo · 14-day trial Visit site
  14. 14

    Foxit eSign

    by Foxit eSign
    Free plan API

    Choose Foxit eSign if your organization needs API-based signatures with templates, bulk sending, and authentication options.

    6.9 Free plan · 14-day trial Visit site
  15. 15

    Zoho Sign

    by Zoho Sign
    Free plan AndroidAPIExtension+4
    6.9 Free plan · 14-day trial Visit site
  16. 16

    Namirial Sign

    by Namirial Sign
    Free plan API

    Choose Namirial Sign if your signing workflow needs identity verification, SMS authentication, templates or an audit trail. Look elsewhere if you need a platform other than API.

    6.8 Free plan Visit site
  17. 17

    Sertifi

    Free plan APIWeb

    Sertifi brings signature requests, payment workflows, and authorizations together for hospitality use cases.

    6.8 Pricing on request Visit site
  18. 18

    SignWell

    by SignWell
    Free plan API
    6.5 Free plan · paid from $10/user/mo (annual) Visit site
  19. 19

    Adobe Acrobat Sign

    by Adobe Acrobat Sign
    Free trial APIWeb

    Acrobat Sign combines signature workflows with document tools, integrations, and team administration.

    6.3 Visit site
  20. 20

    ctSignature

    Free trial APIWeb
    6.2 From $10 Visit site
  21. 21

    Assently API

    by Assently API
    Paid AndroidAPIiPhone+1
    6.1 From €255/mo Visit site
  22. 22

    Firma.dev

    Free trial APIWeb
    5.9 From €0.05 Visit site
  23. 23

    Legalesign API

    by Legalesign API
    Free trial APIWeb

    Legalesign API combines document workflows with embedding, integrations, and live event reporting. Its approval requirement and mobile-form limitation are important considerations for implementation.

    5.9 From £1.50 · 14-day trial Visit site
  24. 24

    Scrive API

    by Scrive API
    Free trial APIWeb

    Scrive eSign API is built for organisations that need configurable electronic signing inside existing systems.

    5.7 Pricing on request · 30-day trial Visit site
  25. 25

    Signaturit

    by Signaturit
    Free trial APIWeb

    Signaturit combines several signature types with identity verification and API options. Its plan descriptions and transaction limits are useful to weigh against a team’s expected signing volume.

    5.7 From €10/user/mo · 14-day trial Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

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