InvariantBook

Authenticated / read-only

Inspect a workbook without mutating it.

Sign in to send a bounded .xlsx file to the inspection service. The service returns a redacted structural snapshot: a summary of workbook structure such as sheets and tables, with cell values and other sensitive content removed. This page has no workbook mutation or publication controls.

Read-only inspection. Workbook mutation/publication is not available yet.

Loading service configuration…

01 / access

Sign in to inspect

Email verification is required before a workbook can be inspected.

Password managers and paste are supported. Your password is used only for this request and is cleared immediately.

Sessions expire. A selected workbook and redacted results are cleared when the session expires or you sign in again. Download the redacted summary before reauthenticating. An optional continuation has a 24-hour access window; closing or reloading this page loses its in-memory handle, and physical storage cleanup may happen later.

02 / observation

Choose a workbook

Only an .xlsx file up to 8 MiB is accepted by this client boundary.

Sign in with a verified email before choosing a workbook.

Optional. The service uses a random lookup code—not workbook content or a password—to let you resume during its 24-hour access window. The code exists only while this page is open; closing or reloading loses it. Sign out clears local state and requests deletion; cloud cleanup may happen later.

Observation only. The response is descriptive JSON. It is not recalculation, verification, approval, mutation, or publication.