About MakerBox
MakerBox is 386 small, focused web tools — PDF, images, text, developer utilities, calculators, colour and CSS. Every one is free, needs no sign-up, and does one job.
Everything runs in your browser
Most online tools upload your file to a server, do the work there, and send something back.MakerBox does not. Each tool is JavaScript that your browser downloads once and then runs on your own machine: the file is read with the File API, the work happens in your tab, and the result is handed to you as a download. There is no upload step, no queue, and no server that ever holds a copy — because there is no server doing the work at all. The pages are static files.
That is also why it is fast. A hundred-megabyte PDF does not travel anywhere before it can be compressed, so the only limit is your own machine rather than someone's upload bandwidth or a free-tier size cap.
You do not have to take our word for it
This is the kind of claim every site makes, so here is how to check it rather than believe it:
- Turn off your network after the page has loaded, then use the tool. Almost all of them keep working — merging PDFs, converting images, formatting JSON — because nothing was going to be sent anyway.
- Open your browser's developer tools, go to the Network tab, and watch while you process a file. You will see the page's own scripts load, and after that nothing carrying your data leaves.
Two honest exceptions, both of which you will see in that Network tab. A few tools fetch a large one-off resource the first time you use them — an embedded font so Korean can be written into a PDF, a recognition model for reading text out of an image or removing a background. Those come from this site to you; nothing of yours goes the other way. And the pages carry advertising, which is a third-party script like any other; what it does is described on theprivacy page.
Why it is free
Advertising pays for it. There is no premium tier, no account, no newsletter and no upsell — partly on principle and partly because there is no server to charge for. Some links to other products may earn a commission, which never changes what a tool does.
Getting in touch
Bug reports are genuinely welcome, especially "this file broke it" ones with the kind of file that did it — those are what most of the fixes come from. Write toeogkr.kim@gmail.com, or use the contact page.