Every tool on ToolkitBook runs locally in your browser. Whether you are formatting code, converting files, or editing images, all processing happens on your device. Nothing you type, paste, or upload is ever sent to our servers. We cannot see your data because we never receive it.
No sign-up or login is required. We do not use cookies to track your behavior across other websites or to build personal profiles. While the site uses standard cookies for basic analytics and advertising (as detailed below), this information is anonymous and cannot be linked to an individual user.
Some tools utilize open-source JavaScript libraries loaded from a CDN (Content Delivery Network). Like the rest of our scripts, these run entirely within your browser and do not transmit your input to any external server. They exist solely to provide the tool's necessary functionality.
If this policy changes, the updated version will be posted on this page with a new "Last updated" date. Substantial changes are unlikely because our core architecture is built on a simple, permanent rule: your data stays in your browser.
Last updated: April 2026