Text tools

Most of the time the tool follows from the symptom. Text that arrived in capitals, because someone had caps lock on or copied it out of a spreadsheet header, wants the sentence case converter: it puts the shouting back into readable prose and capitalizes each sentence once. A headline that needs to look like a headline wants title case instead, which capitalizes the significant words and leaves short function words alone. When you simply need everything in one case, the uppercase and lowercase converter does that and nothing else. Alternating case is the mocking SpongeBob style, with a choice of which case the pattern starts on.

The line tools all treat a line as the unit and never rearrange characters inside one. Remove duplicate lines keeps the first occurrence of each and drops the repeats, which is what you want after concatenating two exports. Sort lines orders them alphabetically, in reverse, or by length. Reverse line order does exactly what it says and nothing more — useful for log files that arrive newest-first when you want to read them in the order things happened.

The cleanup pair looks similar and is not. Trim whitespace deals with characters you could find by hand if you were patient: leading indentation, trailing spaces, runs of blank lines. Clean pasted text deals with the ones you cannot see at all — the curly quotes, non-breaking spaces and zero-width characters that arrive with anything copied out of Word, a PDF or an email client. Those are the usual reason a search box refuses to match text that looks identical to what you typed. If a comparison, a diff or a form validation is failing for no visible reason, start there. The slug generator is the same idea pointed at URLs, and the reading time calculator is the odd one out: it changes nothing and just measures how long a piece takes to read or to say out loud.

Every conversion on this site is a function that runs inside the page you have open. Your text goes into one box, the result appears in another, and there is a button to copy it — but at no point is any of it sent anywhere. There is no upload step and no server that could log, store or read what you paste, because there is no server involved in the conversion at all.

That has practical consequences beyond privacy. The tools keep working after you lose connectivity, as long as the page is already loaded. Nothing imposes a size limit except your own browser's memory. And because the work happens on your machine, the result appears as you type rather than after a round trip.

The one cost is that the conversion itself needs JavaScript. With scripting turned off, every page still renders its explanation, its worked examples and its answers — that part is plain HTML generated when the site is built — but the text box cannot transform anything. It is a deliberate trade: a tool that has nothing to send cannot leak anything.

Each tool has its own page rather than sharing one box with a dropdown, because the interesting part of each one is what it does at the edges — which words stay lowercase in a title, what counts as the end of a sentence, which invisible characters are safe to delete and which are load-bearing. Those notes belong next to the tool they describe.