Privacy Policy

Who we are

Binary Decimal (“we”, “us”) runs binarydecimal.com. You can reach us through the contact form.

What you type into the tools

Calculators, converters and editors do their work in your browser. The numbers and text you enter aren’t sent to us.

Many tools keep their inputs in the page address, so a result can be bookmarked or shared as a link. Anyone you send a link to can see what’s in it. Our host receives the full address when a page loads (see Hosting), and when a shared result from the penis size or GLP-1 calculator is opened, it reads the values in the link to draw the preview card that chat apps show. The address Google Analytics receives never includes them.

On-device AI helpers. In browsers with built-in AI, such as desktop Chrome, the Markdown editor can summarise, rewrite, proofread, translate or draft text using the browser’s own on-device model. It runs on your computer and your text never leaves this device. The first time, your browser downloads the model from its maker (Google, for Chrome), as it does for any site that uses it.

What the tools save on your device

Notes, Markdown and Mermaid documents, blood sugar and weight logs, vision boards, workout progress and preferences are saved in your browser’s local storage and IndexedDB. They stay on your device and are never sent to us. Anyone who uses the same browser profile can see them.

• Backup. The backup page saves everything into one file that you download. We never receive it.
• Folder sync. If you turn it on, your browser writes your saved data to a folder that you pick on your computer. If that folder is inside Dropbox, Google Drive, OneDrive or iCloud Drive, that service copies it under its own terms. We never receive it.

Analytics

We use Google Analytics 4, a service from Google, to learn which pages and features are used. With each page view it receives:

• the page’s address without anything after the “?” or “#”, so none of your inputs, and the page you came from, trimmed the same way;
• on the first page of a visit only, any campaign tags in the link you followed (utm_* and gclid);
• what your browser tells every site: device and browser type, screen size, language and an approximate location worked out from your IP address. Google says Google Analytics 4 doesn’t store IP addresses.

We also record a few actions, for example copying a share link, printing a result, starting a workout or exporting a vision board. These events carry simple labels such as the tool’s name, a workout goal or a number of tiles, never the numbers or text you type. The Markdown editor’s AI helpers record only which helper was used (for example “summarise”), never the text, its length or its language. Health tools send nothing about your health: for example, the blood sugar log records only that a reading was added, and the GLP-1 calculator only that a forecast was shown, never the medication, dose or any value.

Cookies. Google Analytics sets first-party cookies named _ga and _ga_ followed by an ID, which tell one visit from another and last up to two years. The site doesn’t set any other cookies.

Opting out. Install Google’s Google Analytics opt-out add-on, block cookies for this site, or use a content blocker. Every tool works the same without analytics. Google handles this data under the Google Privacy Policy.

The contact form

When you send a message through the contact form, what you type in it (your name and email if you add them, the topic and the message) goes to Netlify, our host, which stores it and emails it to us. Netlify checks messages for spam. We use your message only to read it and reply, and we delete messages we no longer need. Please don’t include health details or other sensitive information. The form records a “message sent” event in analytics with the topic only.

Hosting

Netlify hosts the site. Like any web server, it receives your IP address, the address you requested and your browser’s details when a page loads, and keeps them in its logs for security and operations. See Netlify’s privacy policy.

Content from other sites

Some features load content from other services, which then see your IP address and browser details:

• photos from Unsplash on the home page, in the vision board maker and in the Markdown editor’s cover picker;
• any image link you paste, which loads from the site it points to;
• fonts from Google Fonts in the vision board maker;
• mermaid.ink, if you use the Mermaid editor’s image link: the diagram is written into that link and drawn by mermaid.ink.

Buy Me a Coffee, the studies we cite and other linked sites are separate websites with their own privacy policies. Nothing is sent to them unless you follow a link.

What we don’t do

We don’t have accounts or profiles. We don’t sell, rent or share personal data, and the site shows no ads and runs no advertising trackers.

Deleting your data

• Saved work: delete items in the tool, or clear the site data for binarydecimal.com in your browser’s settings, which removes everything the site saved. To keep a copy first, use the backup page.
• Sync folder: delete the folder you picked.
• Contact messages: ask through the contact form and we’ll delete them.
• Analytics: clear your cookies to start fresh, and use the opt-out above. Google Analytics data isn’t linked to your name, so we can’t look up one person’s visits.

Children

The site isn’t directed at children under 13, and we don’t knowingly collect personal information from them. The kids’ growth calculator is for parents and carers, and what you enter in it stays in your browser.

Changes to this policy

When we change how the site handles data, we update this page and the date at the top. If a change is significant, we’ll say so on this page.

Contact

Questions or requests about your privacy: use the contact form.