DocuSeal is an open-source platform that enables users to collect electronic signatures on PDF documents. It runs via a Docker container hosted on a user's own server, making it a self-hosted solution. The free version includes a REST API and webhooks, which allow developers to integrate the platform with other software. The signatures created are classified as simple electronic signatures under the eIDAS regulation, which applies across the European Union. These signatures are legally valid for internal agreements or quotes but not for legally binding documents that require a higher level of authentication. The platform provides a visual editor where users can upload PDFs and add various fields for signers to complete, such as checkboxes, images, dates, and multiple-choice options. The free version supports up to 10 different field types. Once a document is signed, it is stored on the server's disk by default, though users can configure it to send the signed files to cloud storage services like Amazon S3, Google Storage, or Azure. One key advantage of the self-hosted version is the ability to generate a custom certificate for signing documents. Unlike the cloud version, which uses a certificate recognized by Adobe, the self-hosted instance creates its own certificate by default. Users who want to modify the platform further may need to edit the source code. The software is released under the AGPL license, which means users must give credit to the original developers in the interface. DocuSeal is easy to install using Docker, requiring only a single command. However, not all features from the paid SaaS version are available in the open-source version, such as the ability to create customized document templates for different clients. Additional features like adding a company logo, single sign-on (SSO), reminders, and mass document sending are available only with a Pro license. For those who need legally binding qualified electronic signatures—equivalent to handwritten signatures in the EU—DocuSeal partners with third-party services that charge between $2 and $4 per document. For users who prefer not to self-host, an alternative is Goodflag Community, a free service that provides qualified signatures without the need for self-hosting. The DocuSeal source code is available on GitHub for developers who want to contribute or customize the platform. Users opting for the paid version are advised to use the European instance to comply with the General Data Protection Regulation (GDPR).