About us

A small tool site that treats "never touching your files" as rule number one

What we do

Manqiong Tools is a lightweight online tools site. The Chinese edition offers six tools: compressing a PDF to a target size, compressing images to a target size, counting characters for social captions, counting a thesis the way plagiarism-check services do, counting mixed Chinese-English text, and parsing Chinese ID numbers. What they have in common is that they handle private files or information, so all of them share one technical shape: the entire computation happens in your browser, and files never pass through a server.

Drop a PDF onto the page and your browser simply reads it into its own memory; when compression finishes it produces a local download. Nothing in that process sends file content to our servers — there are no such servers to send it to.

The English edition currently covers the three counting tools. The English pages for PDF compression, image compression and ID number parsing are still being written; until then those three remain available on the Chinese site.

What we do not do

  • We do not upload, store or back up any file you select;
  • we do not keep ID numbers you type — results live only in the memory of the current page;
  • we do not require an account and do not collect phone numbers, email addresses or other identity details;
  • we do not make absolute "the best / the only" claims to oversell the tools;
  • we do not put core functionality behind a paywall; it stays free.

How we fund it

Ad slots and a few affiliate links cover domain and hosting costs. Sponsored content is always labelled "Advertisement", never covers the controls you are using, and is never designed to trick a click. Whether ads load is your choice, and declining them does not disable any feature.

How it is built

The front end is Vue 3 with Vite; every page is pre-rendered into static HTML at build time and served from a CDN, so crawlers receive a complete document and the first screen does not wait for JavaScript. PDF work uses pdf.js and pdf-lib, image work uses the Canvas API, and ID number parsing is a dependency-free JavaScript implementation. Large files are processed in a Web Worker so the interface stays responsive. There is no server-side logic at all, which also means there is no database to breach.

Official domain

Treat tools.manqiong.com as the only official home. The ICP registration number is shown in the page footer. If you see an identical interface on another domain, verify it first — do not type identity documents into a look-alike site.

Contact and feedback

Feature requests, bug reports and corrections are welcome through the contact page, or by email at manqiong_com@163.com.