About

A small set of utilities that do one job each, run instantly, and ask for nothing in return.

Why browser-only

Most tools on the web that touch your data do so by uploading it first. A converter that needs an upload has to be trusted, rate-limited, stored, and eventually deleted — and it costs the operator money for every visit. Running the same work in your browser removes all of that: your files stay on your device, the page loads as a static file so it is fast from anywhere in the world, and there is no queue.

How a tool gets added

A tool ships only if it can be done properly on the client, if it relies on browser APIs wherever they exist (a library is added only where writing it ourselves would be error-prone, and it is loaded on that tool's page alone), and if we can explain the trade-offs in the FAQ. If a task genuinely needs a server, we say so instead of pretending otherwise.

Who runs it

Stackbench is operated by Hangzhou In-Stacks Technology Co., Ltd. (杭州入栈科技有限公司), a limited company in Hangzhou, China. Questions, corrections and data requests go through the contact page, and the privacy policy says what the site does with data.

How it is funded

Advertising. That is the honest answer, and it is the reason pages load fast rather than shipping a dashboard's worth of JavaScript: a tool nobody can use because it took four seconds to render earns nothing. Ads are placed below the tool so they never stand between you and the thing you came to do.

Corrections

If a tool gives a wrong result, that is a bug and we want to hear about it — include the exact input and what you expected instead. Details are on the contact page.