Work Comfortably on a Dense PDF Form

Some forms are designed to be filled in. Others are designed to fit on one side of paper, and you can tell which is which within a few seconds of opening them: six point labels, boxes barely taller than the text they hold, and three columns where two would have been kind. Filling one of those is not difficult so much as fiddly, and fiddly is where mistakes come from.

None of what follows is a secret feature. It is the handful of controls that make a cramped form comfortable, and the habits that keep an answer from landing on the wrong line.

Under the page there are three controls: zoom out, zoom in, and a button between them showing the current level. The two ends move in twenty point steps between sixty and three hundred per cent. The button in the middle reads Fit 100% when the page is sized to the width available, shows a percentage once you have zoomed, and snaps back to fit when you press it.

Fit is not a zoom level, it is a relationship. The page is sized to the space it has, so it changes when you resize the window or turn a tablet on its side, and the percentage you pick is applied on top of it. That is why the same two hundred per cent looks different on a laptop and on a phone, and why returning to fit is the fastest way to reorient yourself after working closely on one corner.

A practical rhythm on a dense form is to work at fit for navigation and at two hundred per cent or so for the actual typing, snapping back whenever you lose your bearings.

One page is rendered at a time, with previous and next buttons and a counter reading the current page against the total. Rendering a single page is what keeps a sixty page document responsive on a modest machine, and it has one pleasant side effect: selecting a field from the layers list moves the view to whichever page that field lives on, so you never have to remember where you were.

The layers list itself is per page. Each row names a field and its type, tints when it has an answer, and carries a badge saying whether it was detected automatically or placed by you. A lower confidence detection gets a review marker, which is the editor being honest about a guess rather than a warning that something is broken. On a dense form, reading down that list is a faster completeness check than reading down the page.

Pressing the question mark key opens the list of keyboard commands, which is short on purpose. Enter moves to the next empty field, which is the one that turns a long form into a rhythm rather than a hunt. Shift and Enter adds a line inside a field that needs two. The commands that use the Alt key export the document, open the document tools, run a rescan, or step back the last tools change.

All of them are ignored while you are typing in a text box, which is deliberate and worth knowing. It means you can type a street name containing a question mark without opening a dialog, and it means a command will not fire until you have clicked away from whatever you were writing.

The same editor runs on a touchscreen, with a compact tool row above the page instead of the side panel, and the controls are sized for a thumb rather than a cursor. Two gestures do most of the work: pinch to zoom anywhere on the page, and double tap an empty area to snap back to a full page fit.

Be realistic about which jobs suit a phone. Ticking boxes, signing with a fingertip and checking a finished document are all genuinely easier on a touchscreen. Typing thirty fields of address detail, or nudging a column of boxes into alignment, is work for a keyboard. Because the document stays in your browser, a session you save on one device does not appear on another, so plan to finish on whichever device you started on.

• Zoom before you aim. A small printed square needs the click to land inside it. Most reports of a box that will not tick are a click that landed a couple of points outside one.
• Read the label, not the position. The status line and the layers list both name the field you selected. On a grid of identical boxes that name is the only reliable way to tell row four from row five.
• Answer down the page, not around it. Moving to the next empty field in order is harder to lose your place in than clicking wherever your eye lands.
• Leave the hard ones for a second pass. A field you are unsure about is better left empty and revisited than filled with a guess you will forget you made.
• Check the finished document before sending it. Open the exported file in a viewer and read it as the recipient will.

A long form rarely gets done in one sitting. Saving a session writes the pages and your work to this device's own storage, so closing the tab is not the end of it, and a restored session opens where you left off rather than back at page one. It stays on the device that made it, for the same reason nothing else here leaves your browser. If you need it elsewhere, export the document and carry the file.