Most books do not begin as books. They begin as a sentence you typed on your phone while waiting for a bus, a half remembered argument you overheard, a character name you liked, a chapter title with nothing behind it yet. If you write, you already know the problem. The ideas arrive at inconvenient moments and in the wrong order, and by the time you sit down to actually work, half of them are gone.
An online notepad is a very unglamorous fix for that, which is exactly why it works. No account setup ritual, no project templates, no learning curve. You open a tab, you type, the text is there tomorrow. For the earliest and messiest stage of a book, that low friction matters more than any feature list.
What follows is a way of using one that goes past "keep a notes file" and actually gets you to an outline.
Catch fragments first, judge them later
The single most useful habit is to separate capture from evaluation. When an idea shows up, your job is to get it down in whatever shape it arrived in. Not to decide whether it is good. Not to decide which chapter it belongs to. Those decisions are slow, and if you attach them to the moment of capture, you will stop capturing.
So keep one scratch pad that is allowed to be ugly. Mine looks like a shopping list written by someone in a hurry. "The brother knows and has known since chapter two." "Open on the funeral, not the diagnosis." "Word: unlit." Nothing there is a scene. Some of it will never be used. That is fine, because the cost of writing a bad line into a notepad is about four seconds.
Two small things make this pad far more useful later. Put the date on each entry, because knowing an idea is three months old tells you something about whether it has survived. And write down the trigger, not just the idea. "Overheard on the train" or "from the thing my sister said about her landlord" gives you a way back into the original feeling when the note itself has gone cold.
Give the book somewhere to live
Once the scratch pad has a few dozen entries, you need a second surface, and this is where a lot of writers stall. They keep piling everything into the same file until it becomes a wall of text nobody wants to open, including the person who wrote it.
The fix is boring and it works. Start a separate pad per book. Inside it, keep three fixed sections at the top, always in the same order, so you never hunt for them:
What this book is. One paragraph, written to a friend, no jargon. If you cannot write it, the book is not ready to be outlined yet and that is worth knowing early. Rewrite this paragraph every few weeks. Watching it change is the fastest way to see what the book is actually becoming as opposed to what you announced it would be.
People and places. Names, ages, jobs, the one thing each person wants and the one thing each is hiding. For nonfiction, this section becomes sources, case studies, and the specific people whose problem the book solves. This is the section that stops continuity errors, and it saves an embarrassing amount of rereading.
Open questions. Everything you have not decided. Who pays for the trip. Whether the middle section is one chapter or three. Whether you are allowed to name the company. Keeping questions visible instead of vaguely worrying about them is the difference between a book that stalls and a book that moves, because a written question is something you can answer on a Tuesday morning, while an unwritten one just makes you avoid the file.
Below those three, everything else can stay as loose as it likes.
Turn scattered notes into scenes and chapters
Now the sorting pass. Set aside an hour, open the scratch pad next to the book pad, and move each fragment into one of four buckets: scene or chapter, character detail, research to do, and cut.
Be honest about that last bucket. Do not delete anything, just move it to the bottom of the pad under a heading you will not read again. Writers hold on to ideas out of sentiment, and a note you cannot bring yourself to delete but also cannot place is usually telling you it belongs to a different book.
For the fragments that survive as scenes, force each one into a single line with a shape to it: who is present, what changes, and where the reader ends up compared to where they started. "Anna visits her father, learns he sold the house, leaves without telling her sister." That line is doing real structural work. A note that reads "the house scene, sad" is not.
Then order the lines. Not perfectly. Just put them in a sequence that makes sense to you today, number them, and look at the gaps. The gaps are the useful part. A run of five tight scenes followed by an enormous blank space is not a failure, it is a diagnosis: you know your opening and you do not yet know your middle. That is a specific problem you can go and solve.
At this point you have an outline. It came out of a plain text file and a couple of focused hours, and it is more real than most outlines produced by fancier means.
Know when the notepad has done its job
A notepad is excellent at catching, holding, and arranging. It is not built to help you write eighty thousand words, keep chapter fifteen consistent with chapter three, or produce something you can hand to a formatter. When you start fighting the tool, that is the signal to move.
The move itself is usually simple. Paste the outline into whatever drafting environment you prefer. Plenty of writers go to a normal word processor and do just fine. Others take the outline into an AI book writer and use it as the structural brief, expanding chapter by chapter and editing hard as they go. Either way, the notepad has already done the part that most books never get past, which is turning a pile of unrelated impulses into an ordered list of things that happen.
Keep the notepad open afterwards. During drafting it becomes the place where you park the ideas that do not belong in the chapter you are currently writing, which stops you from wrecking a good working session by chasing them. A book is mostly a very long series of small decisions, and you need somewhere cheap to put the ones you are not ready to make.
Optional author bio, use it only if your site runs one:
Mykyta Chernenko is the co-founder of AIWriteBook, where he works on tools that help writers get from a rough idea to a finished manuscript. He has been keeping his own book notes in plain text files for years and has no plans to stop.