About UtilityToolsLab

UtilityToolsLab is maintained by a small team that writes backend code and practises competitive programming. The site is what accumulated between those two things across several months of ordinary work.

There was no plan to build a tools site. There was a scratch directory that kept filling up with single-purpose HTML files, because every contest week and every debugging session needed some small conversion nobody wanted to go looking for. Eventually there were enough of them that keeping them scattered was sillier than putting them behind one navigation bar.

The specific thing that pushed us was a habit picked up without noticing. When an API returned something unreadable, the fix was to paste it into whatever formatter ranked first that day. It had happened dozens of times before the obvious occurred to anyone: production payloads, and on at least one occasion a bearer token, were being handed to a site whose retention policy nobody had read.

So the rule for everything here is that your input is processed by JavaScript running in your tab and is never sent to a server. That is not a promise about how carefully your data gets handled. There is no handling, because there is nowhere for it to go. The tools have no backend, which is also why nothing here needs an account.

That constraint is limiting on purpose, and it explains the gaps. Anything that fundamentally requires a server, whether that is a whois lookup, a link shortener or an uptime monitor, is absent and will stay absent. Anything that needs a real cryptographic backend gets a note on its own page telling you to use something else.

What fills the gap is depth in the areas we actually work in. The competitive programming section is the one we open most: bitmask planners, segment tree scaffolding, stress-test harnesses, a convex hull visualiser. Those exist because somebody needed them at one in the morning during a contest, not because a keyword tool suggested them.

Tools break. A parser meets an input nobody tested, a calculator rounds somewhere it should not, a button does nothing on a browser we do not own. When that happens, the Facebook page is where to tell us, and telling us what you pasted in is more useful than telling us it broke.

Requests are welcome on the same page. Most of what has been added since launch came from someone needing a specific thing, and the changelog records what arrived and when.

• 78 tools live, 60 of them present at launch on 2026-07-11.
• Most recent addition: Emoji Remover & Extractor on 2026-08-02.
• Every tool page is checked before each deploy against the writing rules in the repository, which is why none of them share a template.