About Eliroo

Eliroo is a collection of small web tools — converters, counters, encoders, calculators — that all share one rule: whatever you put into them stays on your device.

Who makes it

Eliroo is built and run by KumaPix, a one-person software business based in Finland. There is no team, no investor and no roadmap meeting. Tools get built in batches, tested, and published one at a time.

If you want to reach a person about anything on this site — a bug, a wrong number, a tool you wish existed — contact goes to that person directly.

Why the tools run in your browser

Almost every free online tool works the same way: you upload your file or paste your text, a server processes it, and the result comes back. It is the easy way to build, and it means your data has been on someone else's machine — in an access log at minimum, on disk for an unspecified period at worst.

For a lot of what people convert and count, that matters. Unpublished writing. A client's document. A PDF with an address in it. A token you were debugging. So Eliroo is built the harder way: the processing code is delivered to your browser as part of the page and runs locally, the same way a spreadsheet formula runs locally.

This is a claim you can check rather than one you have to accept. Open your browser's developer tools, switch to the network tab, and use any tool on the site. After the page finishes loading, nothing further goes out.

The trade-offs

Running everything client-side is not free. Some things a server does easily are hard or impossible here — very large video files, anything needing a live data feed such as currency rates, anything requiring a licensed database. Where a tool cannot be built honestly this way, it does not get built, and the tools that do exist say plainly what they cannot do.

How it is paid for

The site is free and intended to stay that way. Hosting costs are low because the pages are static files. In time, display advertising will fund it, placed below the tool rather than above it and in slots with fixed dimensions so the page never jumps while you are using it. There is no paid tier, no account, and nothing behind a wall.

Corrections

Some of these tools state facts — conversion factors, formulas, definitions. If you find one that is wrong, please tell us. It gets fixed and the page notes what changed.