Why local?
Small tools. Clear data paths.
marcel.tools solves concrete everyday tasks directly in your browser without collecting work content.
The product contract
Local by default
The first tools process input only in this browser tab's memory. There is no upload or server-side business logic.
Transparent limits
Every tool states its input, output, size limits, browser requirements, and relevant constraints.
Less persistence
Only theme choice and stable tool IDs for favorites and recents are stored locally—never entered text or results.
When a tool needs the network
Such a feature must disclose purpose, transmitted data, provider, failure behavior, and privacy impact before implementation.