Free, practical, and privacy-friendly online tools for everyone.
XinYuMaTou is a small, independent project focused on building practical web tools that solve real, everyday problems. We believe that useful software should be accessible to everyone — freely available, straightforward to use, and respectful of user privacy.
The tools on this website are designed, developed, and maintained by a single-person team passionate about mathematics, design, and engineering. There is no corporate entity, no venture funding, and no complicated Terms of Service designed to trick you.
Every tool on XinYuMaTou runs inside your web browser. Most calculations and image operations are executed locally on your device using JavaScript — meaning your data never leaves your computer unless you explicitly choose to share it.
Our mission is simple: to create a reliable collection of web utilities that students, teachers, developers, and everyday users can trust. We are committed to the following values:
XinYuMaTou currently hosts a growing list of web tools, organized into several categories:
All tools are designed to work on desktop and mobile browsers. No installation, no account, no email required.
We welcome feedback, bug reports, feature suggestions, and general questions about any of our tools. While we are a small team, we read every message personally and respond as soon as possible.
You can reach us at the email address below. Please include as much detail as possible about the tool or issue you are writing about — including your browser type, device, and the exact steps to reproduce any bug.
Yes. Every tool on XinYuMaTou is free to use without limitation. The website is supported by non-intrusive advertising, and we occasionally publish related content on our main site.
No. With the exception of our Help Center form, nothing you type into a calculator, image tool, password generator, or JSON formatter is sent to any server. Computations happen inside your browser.
Absolutely. Send us an email with a short description of the tool you have in mind and why it would be useful. We love hearing ideas from our users.
We actively test on the latest versions of Chrome, Firefox, Safari, and Microsoft Edge, on both desktop and mobile devices. JavaScript must be enabled for the tools to work.
We believe in being open about how XinYuMaTou is supported. This page explains our revenue model so you can make informed decisions about the tools you use.
XinYuMaTou is an independent project funded primarily through display advertising. We participate in the Google AdSense program, which shows relevant advertisements on some of our pages.
Advertising allows us to keep every tool completely free — no paywalls, no subscriptions, no hidden fees. We intentionally keep ads minimal and non-intrusive: you will not find pop-ups, auto-playing video ads, or full-screen takeovers on this site.
Google AdSense uses cookies and similar technologies to serve ads based on your browsing history across the web. This is known as "interest-based advertising" or "personalized advertising." You can learn more about how Google uses data from our site by visiting Google's Privacy Policy.
If you prefer not to see personalized ads, you can opt out through Google Ad Settings, the Digital Advertising Alliance, or by adjusting your browser privacy settings. Opting out will not remove ads — it will just make them less relevant to your interests.
The best way to support XinYuMaTou is simply to use the tools and share them with friends. Word of mouth is the most valuable kind of promotion for a small independent project like this.
If you find our tools useful and want to show your appreciation, you can also whitelist our site in your ad blocker. This helps support ongoing development and new tool additions without costing you anything extra.