Privacy notice
This notice distinguishes tool conversion data from information transmitted through website access and email inquiries.
Last updated: October 26, 2026
Operator and contact
GreatJIN Tools is operated by GreatJIN. Send privacy questions to greatjin@greatjin.com. Contact instructions explain what information to include.
Data entered into tools
Text, subtitle, code and image files, plus date and unit inputs, are processed in the current browser. Conversion does not require uploading them to a server or creating an account. Inputs and results are not stored in cookies, localStorage or URLs, except for optional notepad autosave.
Downloaded files and copied clipboard content may remain on your device. Stopwatch, lap and timer state exists only in the current page and resets when you reload or close it.
Optional notepad storage
Autosave is off by default. Enabling it stores note content, filename and plain-text/Markdown mode in that browser's localStorage. Language pages share the saved note, but it does not synchronize to other devices.
Disable autosave or clear the note to delete the saved copy. Clearing browser site data also removes it. Other users of the same browser on a shared device can see saved notes, so avoid storing sensitive content.
Optional exchange-rate lookup
Clicking Look up rate in the currency converter sends the source and target currency codes to api.frankfurter.dev for ECB reference rates. This connection may share your IP address and browser information with Frankfurter and network providers. Amounts, manual rates, notes and files are not sent; cookies, credentials and the page referrer are omitted.
Fetched rates for the same pair are reused in page memory for up to five minutes. They are not persisted to browser storage and disappear on reload. Manual mode calculates without external rate lookups. See the provider's Frankfurter API information for details.
Optional IP checks and lookups
The public IP button on the IP/CIDR page requests this site's Cloudflare diagnostic endpoint to display your connection IP and country code. External lookup sends the entered public IP to ipwho.is, which also receives connection IP and browser information. Cookies, credentials, the referring page address and CIDR inputs are omitted. IP locations are estimates, not exact addresses or personal tracking data.
Entered IPs and results are processed only in page memory. Results for the same IP can be reused for 5 minutes and are removed when you clear the input and result or leave the page. To protect the free quota, only the attempt count, window start, next attempt time and block expiry are stored under greatjin.ip-lookup.budget.v1 in localStorage. IPs and lookup history are not saved. Korean and English tabs in the same browser share this limit; expired counts are renewed at the next lookup. External lookup stops if storage or cross-tab locking is unavailable.
The provider enforces the site-wide quota separately from this browser's count. Quota responses block requests until the reset time, with no automatic retries or paid upgrades. See the provider's IPWhois API documentation and Privacy policyfor details. If external lookup is not used, no IP information is requested from this service. CIDR calculations continue to run on your device.
Media file editing
Video and audio editing keeps selected files and results in device memory. Creating a result loads the FFmpeg engine from this site, without external conversion APIs. Engine assets may remain in the normal HTTP cache, but input files, filenames and results are not saved on a server or in browser storage. Leaving the page stops the task and releases temporary files and preview URLs.
Website access and hosting
Cloudflare Pages serves the site and its files. Access information such as your IP address, browser details and requested URL may reach the hosting provider. This is separate from uploading tool input files to a conversion server.
For the hosting provider's practices, see the Cloudflare Privacy Policy.
Email inquiries
Sending an inquiry delivers your sender email address, message and attachments to the operator through email services. This information is used to review and respond to the inquiry. Send only what is necessary and use examples with personal details removed.
Use the same contact for requests to correct or delete your inquiry. In-browser processing of tool inputs does not mean that emails you choose to send remain only on your device.
Cookies, analytics, and advertising
The current site code contains no separate visitor analytics or ad-serving scripts and sets no cookies for service features. It provides AdSense publisher-verification metadata and ads.txt, which alone do not request or run personalized ads.
If advertising is enabled, this notice will be updated for the actual providers, data processing, cookies and consent settings. Policies for login, YouTube API or voting features in other projects do not apply to this tools site, which does not implement them.
External links
LinkedIn, Youtube The Words and external policy links lead to those sites when you select them. Consult each service's notice for its subsequent data processing.