DocuSeal

docuseal.com

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Open-source document signing platform — build fillable PDF forms and collect legally binding e-signatures without DocuSign's per-envelope fees.

Why it is useful

DocuSeal provides a drag-and-drop form builder for adding signature fields, text, and checkboxes to any PDF, then handles the signing flow and audit trail end-to-end. Self-hosting removes per-document/per-envelope pricing entirely, making it practical for businesses sending high volumes of contracts.