BoldSign is Syncfusion's electronic signature platform and API for sending, signing, and tracking legally binding documents. Unlimited signature requests start at $15 per user per month, billed annually, with no envelope caps or overage charges. Upload PDF or Word files, add signature and form fields, set the signing order, and send. Signers need no account or download. Reusable templates, automatic reminders, and live status tracking keep documents moving. Completed documents include a tamper-evident audit trail with signer details and timestamps, designed to support legal enforceability under ESIGN and eIDAS. BoldSign supports SOC 2 Type II, eIDAS, GDPR, PCI DSS, the ESIGN Act, HIPAA, qualified electronic signatures, and data residency in the US, EU, Canada, and Australia. Developers can embed sending and signing directly in their applications. The REST API supports templates, text tags, custom branding, webhooks, SDKs, and a free sandbox.