Each guide answers its question in the first hundred words, works through a real example, and says what the approach does not cover.
20 guides, grouped by what you are working on.
Everything in this section operates on a document you already have, at the level of pages rather than words. Combining files, pulling pages out, putting them back in a different order, stamping them, or turning images into a document you can send.
The largest section, because "I have a picture and it is wrong somehow" covers a lot of separate problems. It is too big, the wrong format, the wrong shape, it has something in it you want to draw attention to, or it has data in it you did not know was there.
Caption files and the metadata that travels with video. The subtitle work is the substantial part: converting between the two formats that matter, diagnosing whether a file needs a constant shift or a frame-rate scale, merging two halves of a film and splitting one file in two.
CSV is a family of conventions rather than a format, which is why an export that one program writes happily is unreadable in another. The delimiter, the quoting style, the line ending and the character encoding are all places where two tools can disagree while both claiming CSV support.
Small jobs that are awkward everywhere else. Reformatting a block of text that arrived with hard line breaks. Counting it accurately when emoji are involved. Turning a link into something a phone camera can read.
One tool, and a deliberately narrow one: a discounted cash flow model built from figures you type. No market data is fetched, live or historical, and no figure leaves the page.
This page is complete without JavaScript. The navigation menu at the top and the theme toggle need it; the tools themselves need it too, because they run in your browser rather than on a server.