Time Converter
Every timezone. Zero effort.
A browser extension that detects times on any web page and converts them to your local timezone. Hover to check, or inject the conversion right into the text. No servers. No accounts. No tracking. It only runs on sites you explicitly allow. You're in control of where it activates.
How it works
Time Converter only runs on sites you explicitly enable it on. No blanket access to your browsing. When you want conversions on a page, click the toolbar icon, hit Enable on this site, and confirm the permission prompt. From that point on, it scans visible text for recognizable timezone abbreviations and converts them to your local time. You can revoke access per-site from the popup or the settings page at any time.
Tooltip Mode
Hover over a detected time to see the conversion in a floating tooltip. The original text stays untouched.
Inline Mode
The converted time gets injected directly into the page, right next to the original. No hovering required.
Features
Smart Detection
Recognizes common formats: 10:00 AM EST, 14:30 UTC,
10.30 BST. Ignores standalone numbers and non-time patterns.
Layout Safe
Built with the TreeWalker API and absolute-positioned tooltips. Your pages look exactly like they did before. No broken layouts, no CSS conflicts.
12h or 24h
Choose your preferred time format. The extension remembers your choice and applies it everywhere, on every page, every session.
Per-Site Permissions
The extension only activates on sites you approve. No blanket access. Enable it with one click, revoke it just as easily from the popup or settings.
Install
From the Chrome Web Store
Get Time Converter on the Chrome Web Store . Works in Chrome and any Chromium-based browser.
From Firefox Add-ons
Get Time Converter on Firefox Add-ons . Works in Firefox and Firefox-based browsers.
From Source
- Clone or download the repository.
- Open
chrome://extensionsin Chrome orabout:debugging#/runtime/this-firefoxin Firefox. - Chrome: Enable Developer mode, click Load unpacked, and select the extension folder.
- Firefox: Click Load Temporary Add-on and select the
manifest.jsonfile.
Privacy Policy
Last updated: March 26, 2026
The short version
Time Converter does not track you. There are no servers, no accounts, no analytics, and no telemetry of any kind. The extension runs entirely inside your browser. Your browsing data never leaves your machine.
How it works technically
When you visit a site you've enabled the extension on, the content script scans the visible text for time patterns. It converts detected times using the Luxon library, which runs locally in your browser. No external API calls are made. The timezone conversion happens entirely on your device using your system's timezone data.
Permissions explained
The extension requests two permissions upfront. Here is exactly what each one does and why it is needed.
storage saves your preferences (time format, display mode, target
timezone, enabled/disabled state). On Chrome, if you are signed into your
Google account, Chrome may sync these four settings across your browser
instances via chrome.storage.sync. On Firefox, settings are stored
locally. In both cases, we have no access to your browser account or any synced
data beyond these settings.
activeTab lets the extension read the URL of the tab you are
currently viewing when you click its toolbar icon. This is how it knows which
site to request access for. It does not run on pages automatically or in the
background.
Beyond those two, the extension uses optional host permissions. It does not request access to all sites by default. Instead, when you click Enable on this site, your browser prompts you to grant access to that specific site. The extension only runs its content script on sites you have explicitly approved. You can revoke access for any site from the popup or the settings page, and the browser removes the permission immediately.
Data collection
None. The extension collects no data. It sends no network requests. It has no server to send data to. There is no analytics code, no error reporting service, no usage tracking. Zero.
Third-party code
The extension bundles Luxon, a JavaScript date/time library. It runs entirely in-browser. Luxon makes no network requests and has no telemetry.
What happens to your data
There is no data. If you uninstall the extension, your browser removes the four settings values from storage. That is everything. There is nothing else to delete because nothing else was ever stored.
Distribution
Time Converter is available on the Chrome Web Store and as a Firefox add-on. It is the same extension with the same permissions and behavior on both browsers. The extension is open source under the MIT License. The source code is publicly available. You can read every line of it. If you prefer not to trust a pre-packaged extension, you can clone the repo and load it unpacked yourself. The code does what this policy says it does, and you can verify that.
Limited Use Compliance
The use of information received from Google APIs and browser permissions will adhere to the Chrome Web Store User Data Policy, including the Limited Use requirements.
Contact
Questions about this policy or the extension? support@lethio.com
In summary: Time Converter runs in your browser, converts times locally, and does not collect, store, or transmit any data. That is the whole policy.