OpenSign is an open-source digital signature platform that enables secure signing of documents with ease and efficiency. It's designed to provide an affordable alternative to commercial e-signature services like DocuSign, offering transparency and security to meet your unique business needs.

OpenSign allows users to upload documents, sign those documents, request signatures from others and sign documents digitally. It uses state-of-the-art cryptographic algorithms to ensure that all documents are digitally signed securely and are legally binding in most of the countries.

Yes, OpenSign is completely free to use with the free self-hosted version which offers unlimited digital signatures. Being open-source, its free open source version can be downloaded, used and modified without any cost. We believe in democratizing digital signature technology for everyone. Even the cloud hosted version free tier comes with unlimited free digital signatures, you only need to pay to use the advanced version of the software that comes with features like API access, public links, embeddings, advanced validations etc. For most of the small & medium businesses, free version should suffice.

To set up OpenSign, simply follow the installation guidelines available on our self-host documentation website. The source code for OpenSign is hosted on our GitHub repository. If you encounter any challenges, feel free to reach out to our active community for assistance on our Discord channel.

OpenSign supports various formats including PDF, Docx, JPG & PNG which are widely used for contracts, agreements and other formal documentation.

Security is our top priority. OpenSign ensures document integrity by using advanced encryption methods and we constantly update our platform to incorporate the latest in security practices. The best part is, our source code is open and being monitored by hundreds of developers constantly. This makes identifying any security issues significantly faster.

OpenSign ensures its electronic signatures comply with electronic signature laws across various jurisdictions, delivering legally binding outcomes. Additionally, OpenSign digitally seals your documents with a P12 certificate, safeguarding them from tampering—any alteration to the completed document invalidates the signature. For added assurance, OpenSign generates a completion certificate for every finalized document, which includes detailed access logs, signature timestamps, and other pertinent information.

You can get support or report issues through our GitHub issue tracker or join our Discord community where our team and community members can help you troubleshoot any problems. Official support is also available under the cloud hosted plans.

We welcome contributions from the community. Whether you're a developer, a designer, or just an enthusiast, you can contribute to the OpenSign project through code contributions, documentation, translations, and more.

Verification can be easily conducted through any software(we recommend Adobe Acrobat reader) which checks the digital signature against the document and the signer's digital certificate to ensure it has not been tampered with and remains valid.

Adobe Acrobat shows a message "Signed and all signatures are valid" if the signature is valid and the document is not tempered with.

You can click the "Signature Panel" to see other details of the signature.