Privacy Policy — Chrome Custom Zoom
Last updated: October 4, 2026
Chrome Custom Zoom is developed by Alaa Masalha. Its purpose is to control Chrome's native page zoom through an exact percentage, adjustable step size, and saved presets, with optional controls for Chrome's global default and minimum font sizes.
Information handled by the extension
The extension processes the active tab's numeric ID, current zoom factor, and default zoom factor in memory to display and change zoom. When global font controls are enabled, it also reads Chrome's current default and minimum font sizes and their control status so it can display and change those browser settings. It does not read website content, tab URLs or titles, browsing history, cookies, passwords, or personal communications.
It saves only the following preferences in chrome.storage.local on your device:
zoomStep: your chosen number of percentage points per click.zoomPresets: up to five saved zoom percentages.fontSizeEnabled: whether the extension's global font-size controls are enabled.
These preferences are used only to provide the zoom and font-size controls. The extension does not create accounts, identify users, record a history of actions, or include advertising, analytics, or telemetry. It does not transmit, sell, or share your preferences or other user data with the developer or third parties. It does not use chrome.storage.sync.
Chrome's zoom and font settings
The extension calls Chrome's native zoom APIs. Under Chrome's normal settings, Chrome remembers zoom for a site's origin and may apply it to other tabs on the same origin. Chrome manages those browser settings separately. The extension does not store site addresses.
When Global Font Size is enabled, the extension uses Chrome's native font-settings API to control the browser-wide default font size and minimum font size. These are global Chrome preferences rather than per-site settings. Turning the control off clears the extension's font-size overrides. Reset restores Chrome's underlying font-size values while keeping the controls enabled.
Permissions and executable code
The extension requests storage for the local preferences above and fontSettings to read and change Chrome's global default and minimum font sizes when that feature is enabled. It does not request host, browsing-history, tabs, or activeTab permissions, and does not inject scripts into websites. It obtains a tab ID and adjusts zoom using the parts of Chrome's Tabs API that do not require those permissions.
All executable extension code is included in the package. The extension makes no network requests and does not download or execute remote JavaScript or WebAssembly.
Retention and deletion
Preferences remain in your local Chrome profile until you change or delete them or uninstall the extension. Clicking a preset's filled star removes it from saved storage immediately; the row remains visible in the current popup until it closes. Uninstalling removes the extension's local storage.
Site zoom settings are owned by Chrome and may remain after uninstalling. Use Reset before uninstalling, or manage saved zoom levels in Chrome's settings. Global font-size overrides can be cleared by turning Global Font Size off. The developer has no copy of your local preferences to retrieve or delete.
Website and support
The project website contains no analytics or tracking scripts. When you visit the public GitHub repository, GitHub Pages website, or submit a support issue, GitHub may process ordinary connection information and any content you choose to provide under GitHub's Privacy Statement. These visits are separate from the extension's local operation. GitHub issues are public; do not include confidential information.
Limited Use
Chrome Custom Zoom uses information received from Google APIs solely to provide its disclosed zoom and font-size controls and complies with the Chrome Web Store User Data Policy, including the Limited Use requirements. It does not sell data, use data for advertising or credit decisions, or transfer data for unrelated purposes.
Changes and contact
This policy will be updated if the extension's data handling changes. Questions and privacy requests can be submitted through the project issue tracker.