Vellum

Vellum turns a pasted HTML or Markdown document into a link that renders as a finished page rather than a raw file dump: Markdown becomes a clean typeset reader, and author HTML runs live but walled off inside a sandboxed iframe with an opaque origin and no access to Vellum, cookies, or the surrounding page. Pages stay re-readable until they expire, from a day to a year, 30 days by default, and can be revoked at any time, so this is hosting rather than a one-time reveal.

It is zero-knowledge by default: the document is encrypted in the browser before it is sent, using the same 256-bit key and 600,000-round PBKDF2 approach as its sibling Tockermail, and the key travels only in the link fragment. Beyond single pages, Vellum builds navigable documentation sites, a collection is one encrypted table of contents plus its pages under one key, rendering as a sidebar-and-reader docs site. An opt-in public mode stores a collection in the clear so it can be keyless and search-indexable. Accounts are optional; anyone can post and read anonymously.

Vellum is a working first version: anonymous posting, link-based viewing, sandboxed HTML and public docs sites are all verified in production. Web sign-in by email code is currently unreliable, so the signed-in account area and drag-and-drop collection builder are tested at the code level rather than fully exercised live, and a programmatic create interface, more document kinds, attachments and paid tiers are not built yet.