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OpenSign

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Your ultimate open source PDF E-Signature Solution.

  • Free plan
  • Free plan with unlimited self-signing
Facts from opensignlabs.com, checked October 28, 2026.
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At a glance

  • OpenSign is listed under E-signature, alongside airSlate SignNow, BoldSign and Box Sign.
  • OpenSign has a free plan.
  • OpenSign's pricing model: free plan with unlimited self-signing.
  • OpenSign's main features: Unlimited free signatures, Signature requests, Reusable templates, Completion certificate, Secure document storage.
  • OpenSign has a public API.
  • OpenSign can be self-hosted.

Facts from opensignlabs.com, checked October 28, 2026.

AI summary

The summary writes itself once 5 people have reviewed this tool.

It's built only from what reviewers say: who it's best for, who should think twice, and what comes up again and again.

Reviews needed for a summary0 of 5

What we know so far

askusers.
CategoriesContent policyFor vendorsTermsPrivacyReviews API
Main features
Unlimited free signatures, Signature requests, Reusable templates, Completion certificate, Secure document storage
Free plan
Yes
Public API
Yes
Self-hosted option
Yes
Facts only, from the tool's website or its vendor. Opinions come from reviewers. Suggest a correction
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How OpenSign compares

With other e-signature tools, on the facts each website lists.

All OpenSign alternatives
  • airSlate SignNowNo reviews yet

    The facts checked for both don't set them apart yet.

    OpenSign vs airSlate SignNow
  • BoldSignNo reviews yet

    The facts checked for both don't set them apart yet.

    OpenSign vs BoldSign
  • Box SignNo reviews yet

    The facts checked for both don't set them apart yet.

    OpenSign vs Box Sign

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