Let's Seal – Let's Encrypt for document signing, free and self-hosted

In plain words

Let's Seal is a free, self-hosted tool for digitally signing and verifying documents and files without vendor lock-in. It implements an open standard that chains signatures to a public certificate authority, logs records in a transparency ledger, and timestamps file hashes. The tool is designed for developers and organizations seeking an alternative to commercial document signing platforms, enabling anyone to verify sealed documents without subscription fees or proprietary software requirements.

written from the facts on this page · September 2026

From the sources

The open standard for proving any file is real, unaltered and sealed - letsseal/letsseal

In the maker’s words, at launch

TLDR, Let's Seal gives the finger to Adobe and every doc signing tool (docusign, google, etc) who pay to play with the Adobe Approved Trust List and then charge you for something that should be free. Currently even the person checking if a document/contract is sealed or code is authentic has to also be inside…

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