ProofSign - 2026 Pricing, Features, Reviews & Alternatives

ProofSign is a cloud-based PDF sealing, signing, and verification platform that applies cryptographic audit trails to finalized documents. Uploaded files are SHA-256 fingerprinted and scanned for malware before entering single- or multi-party signing workflows with role-aware sequencing. Once approved, each document is sealed with an immutable manifest embedded directly in the PDF. Any post-seal alteration invalidates the fingerprint and is detected instantly. Third parties and regulators can confirm document authenticity at a public verification endpoint without creating a vendor account, and API access supports programmatic verification at scale. The platform is hosted on AWS eu-west-2 with server-side encryption, scoped IAM roles, and TLS 1.2+ in transit, and is accessible via a web-based interface or API.

ProofSign targets individuals and businesses of any size that require a lightweight, secure method for sealing and signing finalized documents without a full document-collaboration suite. Enterprise accounts support configurable retention windows beyond the seven-year default, and chunked uploads accommodate large files on paid plans. Signer authentication is handled via OTP or magic link, and every workflow captures a full audit-ready event trail including timestamps, role context, signer hashes, and device metadata. Optional blockchain anchoring provides decentralized proof for use cases requiring an additional layer of independently verifiable evidence.

Applicable across audits, disputes, compliance reviews, and regulatory verification, ProofSign concentrates exclusively on the finalization and verification stage of the document lifecycle. Cryptographic evidence and immutable manifests are built into every workflow by default. A public, open verification endpoint eliminates vendor lock-in, allowing any party to confirm document integrity without proprietary tooling or a platform subscription.