Open-source e-signature apps in 2026

New this season

1. 1
   Letsseal letsseal

   The open standard for proving any file is real, unaltered and sealed

   Framework or platform Experimental You are exploring file provenance and timestamping and want to try a new approach.

   ★ 377 Apache-2.0 JavaScript Active, pushed 14 days ago

All open-source e-signature apps, ranked

Complete systems you can adopt 4

1. 1
   DocuSeal docusealco

   Open source DocuSign alternative. Create, fill, and sign digital documents ✍️

   Complete system Production-ready You want DocuSign-style e-signatures without per-envelope fees and can run a Docker container.

   ★ 19k AGPL-3.0 Ruby Active, pushed today
2. 2
   Documenso documenso

   The Open Source DocuSign Alternative.

   Complete system Production-ready A business wants an open DocuSign alternative with an API it can embed in its own product.

   ★ 16k AGPL-3.0 TypeScript Active, pushed 5 days ago
3. 3
   Signaturepdf 24eme

   Free open-source web software for signing PDF (alone or with others) and also organize pages, edit metadata and compress pdf

   Complete system Usable An organisation wants simple self-hosted PDF signing and page tools, for example on YunoHost.

   ★ 832 AGPL-3.0 JavaScript Active, pushed 12 days ago
4. 4
   SignServer CE Keyfactor

   SignServer – Open source, PKI-based signing software to sign code, documents, timestamps and more.

   Complete system Production-ready Your organisation needs central, audited code or document signing with keys kept off developer machines.

   ★ 441 LGPL-2.1 Java Active, pushed 2 months ago

Frameworks and platforms to build on 1

1. 1
   Letsseal letsseal

   The open standard for proving any file is real, unaltered and sealed

   Framework or platform Experimental You are exploring file provenance and timestamping and want to try a new approach.

   ★ 377 Apache-2.0 JavaScript Active, pushed 14 days ago

Building blocks for your own system 5

1. 1
   Core LibPDF-js

   A modern PDF library for TypeScript. Parse, modify, and generate PDFs with a clean, intuitive API.

   Building block Experimental You need PDF manipulation and signing in TypeScript beyond what pdf-lib offers.

   ★ 1.8k MIT TypeScript Active, pushed 7 days ago
2. 2
   DSS esig

   Digital Signature Service : creation, extension and validation of advanced electronic signatures

   Building block Production-ready You build software that must produce or validate eIDAS-compliant signatures in the EU.

   ★ 1k LGPL-2.1 Java Active, pushed 19 days ago
3. 3
   Node-signpdf vbuch

   Simple signing of PDFs in node.

   Building block Usable Your Node.js app must cryptographically sign generated PDFs.

   ★ 943 MIT JavaScript Active, pushed 13 days ago
4. 4
   pyHanko MatthiasValvekens

   pyHanko: sign and stamp PDF files

   Building block Usable You need standards-compliant PDF signing or validation in Python.

   ★ 794 MIT Python Active, pushed yesterday
5. 5
   Pdfsign digitorus

   Add/verify Advanced Electronic Signature (AES) and Qualified Electronic Signature (QES) in PDF (using pure Go)

   Building block Usable A Go service must sign or verify PDFs to eIDAS levels.

   ★ 171 BSD-2-Clause Go Active, pushed 7 days ago

Integrations 1

1. 1
   LibreSign LibreSign

   Control how your documents get signed

   Integration Usable Your organisation already runs Nextcloud and wants document signing inside it.

   ★ 838 AGPL-3.0 PHP Active, pushed 5 days ago

Developer tools 1

1. 1
   Pdf-sign svenssonaxel

   A tool to sign PDF files. With Linux support.

   Developer tool Usable You need to stamp a handwritten-style signature onto a PDF without a commercial app.

   ★ 164 MIT Python Slowing, pushed 5 months ago

Compared head to head

Looking for an alternative to

Open-source licenses

• Permissive: 6. Use it anywhere, including in closed products. You keep the copyright notice; Apache-2.0 also grants patent rights.
• Network copyleft: 4. Like GPL, and running a changed version as a web service counts as distributing it, so its users get the source too.
• Weak copyleft: 2. Changes to the licensed files must be shared, but you can link them into a closed program.

Languages

JavaScript 3, TypeScript 2, Java 2, Python 2, Ruby 1, PHP 1 and Go 1.