Effective July 2, 2026 · Applies to the Stamp browser extension and web app
Stamp collects no data. Your documents never leave your device. All PDF processing — Bates numbering, exhibit stamps, watermarks, splitting, extraction, flattening — happens locally in your browser using a bundled JavaScript library. There is no server, no account, no analytics, and no telemetry.
Two things, both kept in your browser's local extension storage and never transmitted:
1. License state. After you enter a Pro license key, the activation result is cached
locally so you don't have to re-enter it.
2. Saved templates. Your own stamp presets (e.g. a Bates prefix and position for a client
matter), if you choose to save any.
Uninstalling the extension removes both.
When — and only when — you enter a Pro license key, the extension sends that key to Gumroad's license
verification endpoint (api.gumroad.com/v2/licenses/verify) to confirm the purchase. The request
contains the key you typed and the product identifier — never any document content or personal data.
Gumroad's handling of purchase data is covered by Gumroad's privacy
policy. If you never enter a key, Stamp makes no network requests at all.
Stamp does not collect, store, or share personal information, document content, filenames, usage
analytics, browsing history, or anything else. The extension requests a single browser permission
(storage) and cannot read or modify web pages, tabs, or browsing activity.
If this policy changes, the updated version will be posted at this address with a new effective date. Because Stamp's architecture has no data collection to begin with, changes would only ever narrow or clarify, not expand, data use.
Questions: bearman.derek@gmail.com