6. Opening the PDF Before You Buy

Owen's papers made it onto the device. Beatrix's contract made it too. A file that has arrived, though, is not yet a file you can read. A specification sheet will never tell you whether the page in front of you is usable. Ten minutes with your own document will. This chapter is about those ten minutes: what to look for, what each platform says its PDF reader can do, and how to size the memory and choose the operating system that sits underneath it all.

What happens when a fixed page meets a small screen

Start with one of Owen's engineering papers. It is printed for a sheet of letter or A4 paper. The text runs in two columns, and there is a diagram halfway down the second one. He reads at a desk, about forty-five centimetres from the screen.

An ordinary novel on an e-reader is not a picture of a page. It is a stream of words, and the device lays those words out to fit whatever screen it has. Make the font bigger and the words flow onto more pages. That flowing is called reflow.

A PDF works differently. It is a description of exactly where every letter, line and figure sits on one particular sheet of paper. The column break, the caption under the diagram and the equation spread across two lines are all fixed in place. To reflow a PDF, a reader has to guess which letters belong to which sentence and in what order they come. A plain single-column report often survives that guess. A two-column paper with equations, tables and headings often does not. The columns can get stitched together in the wrong order, or a figure lands in the middle of a sentence. This is why Owen's record already says his PDFs stay unconverted.

So Owen is not mainly asking for reflow. He is asking how well the device handles a fixed page. A few separate tools answer that, and it helps to keep them apart.

Zoom makes the page bigger, so only part of it fits on the screen and you move around to see the rest. Margin crop cuts away the white border that a printed page carries, so the text itself fills more of the screen. Nothing gets rearranged. You just stop wasting space on blank paper. Column and landscape modes turn the device sideways, or step through the page in pieces, so one column at a time fills the width.

Here is what each platform documents for those tools.

On a Kindle, a PDF you load yourself does not reflow. The only reflow route is the older Send to Kindle conversion, where you type the word convert in the email's subject line and Amazon turns the document into its own format on its servers. On the device you get pinch-to-zoom and panning, plus a double tap that snaps the zoom to a column it detects. You can rotate the screen to landscape. There is no margin crop, either automatic or manual.

On a Kobo, the stock software shows a PDF strictly as a fixed image of each page. There is no reflow. It has pinch-to-zoom, a zoom slider, dragging to pan and double-tap zoom on current firmware. It has no margin crop in the stock software, so cutting away white space means zooming by hand on each page. Landscape is available, but in landscape the Kobo steps through the page in top and bottom strips. On a two-column paper, a strip runs straight across both columns, so you read the top of column one and the top of column two together before moving down.

On a Boox, the reader app is called NeoReader. It does reflow, for PDFs with real text and also for scanned ones. It gives you control over font, size, spacing, margins and column detection. It offers fit-to-width and fit-to-page. It has automatic margin trimming, a crop box you draw yourself, and separate crop settings for odd and even pages, because a printed book's inner margin switches sides. It also has a feature called Article Mode. It splits the page into four to nine pieces and moves through them in reading order, down the left column and then down the right. That is the layout of Owen's paper.

Now tie this back to the legibility work from earlier in the course. A full letter-sized page shrunk onto a six- or seven-inch screen puts body text under about a millimetre tall. No pixel density rescues that at forty-five centimetres. On those small screens, the Kindle's column snap often breaks around equations, tables and headings, and the Kobo's sideways strips force constant panning. People with Kobos often install a third-party reader called KOReader to get usable column cropping, but that is an unofficial addition rather than what Kobo ships.

Around ten point three inches, with devices such as the Kindle Scribe or the Boox Go 10.3, a two-column paper becomes readable in portrait without zooming, and nine- and ten-point academic type holds up on a three-hundred-pixel-per-inch screen. At thirteen point three inches, as on the Boox Note Max, a letter or A4 page shows at roughly its printed size, and cropping stops mattering. So for Owen, screen size and the PDF tools trade against each other. A big screen needs fewer tools. A small screen needs very good ones.

Reading the page is half the job. Owen also needs to find things. Can he search for a word? Can he jump to page twelve? Can he get from the citation "see figure four" to figure four and back?

All three platforms search inside a PDF that contains real text, as opposed to a scanned photograph. The Kindle adds dictionary and Wikipedia lookups when you select text. The Kobo can search, but in the stock software it cannot select text in a fixed PDF, so dictionary pop-ups are switched off. The Boox searches the full text, and it carries an on-device text-recognition engine, called optical character recognition, which can make a scanned page searchable. It also offers dictionary lookup, translation and read-aloud.

For moving around, the Kindle has a scrub bar, jump to page number and the PDF's own table of contents. The Kobo has a progress scrubber, a table-of-contents drawer, bookmarks and a direct page jump. The Boox has a grid of page thumbnails, the table of contents and bookmarks. None of those documents promise to follow a citation link inside the paper. Test that one yourself. Tap a reference and see whether it goes anywhere, then see whether you can get back.

Then there are the eyes. On a fixed PDF, the Kindle will not change the font or the size, because those are baked into the page. What it offers is a contrast setting with five levels, plus dark mode on hardware that supports it. The stock Kobo offers no font, size, margin or contrast changes on a PDF, and dark mode only where the system has it overall. The Boox, in fixed-page mode, has rendering filters. They thicken thin text, whiten faint watermarks, sharpen images and deepen dark colours. In reflow mode it gives full font control. For a reader whose eyes are the issue, that difference can decide everything: on two of these three platforms, a fixed PDF is the size and darkness it was printed at.

Beatrix comes at the same files from a different side. The Word files she gets by email become reflowable when Send to Kindle converts them, so they behave like a book. Her contract PDF stays fixed. What she needs from it is a highlight on a clause, a note next to it, and some way to get those marks back out to send to someone else.

On an ordinary Kindle, you can highlight selected text in a PDF that has a text layer, and add typed notes. Those highlights come out in two ways: a plain text file called My Clippings, which you copy over a cable, or Amazon's Kindle Notebook page on the web. On the Kindle Scribe, you can also write on a PDF with the pen when the PDF arrived by Send to Kindle. Pen writing on a PDF copied over a cable is more limited. The Scribe exports handwritten markup by email as a flattened PDF, which means the marks are pressed into the page image itself. A cable transfer does not produce that file.

On a Kobo without a pen, there is no PDF highlighting or annotation at all. On a Kobo with a pen, such as the Libra Colour, Sage or Elipsa, you can draw and highlight directly on PDFs that are free of copy protection. Those marks are saved inside the PDF itself. You get them back by copying the file over a cable, or through Dropbox or Google Drive sync on hardware that supports it.

A Boox does both kinds of marking at once: text highlighting in colour, underline or strikethrough, and pen writing directly on the page. Typed notes export as text files. Pen marks can be burned into the PDF or saved as standard annotations that Adobe Acrobat and other viewers can read and edit. They leave the device through Boox's own transfer tools, its cloud service, or other storage apps.

So Beatrix's open question about export format gets a concrete shape. On a plain Kindle she gets a text file of highlighted lines, separate from the contract. On a Scribe with an emailed contract she gets a flattened copy with her marks in it. On a pen Kobo or a Boox she gets the contract itself with her marks inside. Which of those her colleagues can use is something she can answer now. Her handwritten meeting notes are a separate workflow with its own tests, and they come with writing.

Behind every one of those tests sits hardware you cannot see in a shop, and the next question is how much of it matters.

Storage is the easy one, once you know what lives in it. A novel is typically one to five megabytes. A complex academic paper, textbook or scanned manual runs from fifty to five hundred megabytes. Nadia reads about eighty novels a year. Even at five megabytes each, that is four hundred megabytes a year, and a decade of reading still fits in a few gigabytes. OCDevel's table gives sixteen gigabytes its top reading score for exactly this reason: it holds thousands of ordinary ebooks. Bigger storage stays filterable on the table, but it earns no extra points for ordinary reading.

Owen's eight hundred PDFs are a different sum. Suppose, purely as an illustration, that most are fifty megabytes and some are scans much bigger than that. Eight hundred at fifty megabytes is forty gigabytes before a single scan. That overflows the sixteen to thirty-two gigabytes fixed into Kindle and Kobo units, which have no card slot. Boox devices ship with thirty-two to a hundred and twenty-eight gigabytes, and some models keep a microSD slot. Owen should weigh one real folder on his computer before he trusts that estimate. The table records storage as shipped in the box, so a number on a card-slot device tells you nothing about how big a card it will take.

There is a catch with Android. On a Boox, part of the storage goes to the Android system itself, to the apps you install and to their caches: Libby, the Kindle app, a cloud sync tool. A closed reader keeps its space for its own firmware and your books.

RAM is the working memory a device uses while it is doing something, and it matters in two cases. The first is a big PDF. To show a scanned, high-resolution page, the device has to hold the whole uncompressed image in memory, and redo it every time you zoom. Too little memory shows up as pages that fill in like a checkerboard, slow page turns, or a document that crashes. The second is Android. The Android system and its background services use about two to three gigabytes on their own. A Boox with two gigabytes runs short, closing background apps, switching slowly, and stalling when it redraws a PDF. Four to six gigabytes or more keeps several apps, cloud sync and pen annotation running together.

Kindles and Kobos are a different story. They run a stripped-down Linux system with one job, typically on half a gigabyte to one gigabyte, and they render one document at a time without other programs competing for memory. That is why OCDevel's table says RAM matters for Android readers running several apps, and that closed firmware hides it from you. For Nadia's novels, RAM barely enters the decision. For Owen running a big PDF on Android with a sync app in the background, it does.

Then the operating system, judged by what it lets you do and what it asks of you.

A closed system, Kindle or Kobo, runs only its maker's software. You cannot install other apps. In return the device does very little in the background, which is where the weeks of battery come from. The table credits the Paperwhite with about twelve weeks as claimed. Its PDF tools are the ones described above and no more, unless you add unofficial software. Updates come from the maker: both Amazon and Kobo document security updates for at least four years, Amazon from the sale and Kobo after sales end, and some Amazon devices longer. Amazon has cut store access on hardware older than about ten to fourteen years. Kobo has a long record of giving one firmware to many generations of devices. Both want an account: Amazon's for setup, purchases and sync, and Kobo's for setup and its built-in library sync. Getting around either is a workaround, not a supported path.

Android, as on a Boox, opens the door to the Google Play store and to apps you install yourself: Libby, other readers such as KOReader or Acrobat, Google Drive and sync tools. That is what lets a Boox borrow Nadia's library books through Libby wherever Libby works. The cost is upkeep and battery. Background activity turns weeks into days, and Boox runs its own refresh system to keep Android's fast-moving screens tolerable on electronic paper. Boox supports its firmware and apps for about three years and does not promise major Android upgrades. In practice a Boox usually stays on the Android version it launched with, and improvements arrive through Boox's own layer. On the other hand, it needs no account for basic use or for loading files. A Boox account is optional, and a Google account is needed only for the Play store.

So for Owen, Android buys PDF tools and room for a large library, at the cost of battery and a shorter support promise. For Nadia, a closed system's long battery and simple upkeep cost her almost nothing she would use. On ocdevel dot com slash ereaders, the os, storage and ram columns let you filter by exactly these trades, and each is worth reading in the light of your own library size and the apps you need.

All of that comes down to a test you can carry into a shop or run within a return window. Bring one real file, the hardest one you read. For Owen, that is the two-column paper with the diagram. For Beatrix, the contract. Then work through it in order.

1. Open the file at full page and hold it at your normal reading distance, and note whether body text is readable without touching anything.
2. Try each tool the platform has: zoom and pan across both columns, crop if it exists, rotate to landscape, and Article Mode or reflow on a Boox, then note where the reading order breaks.
3. Search for a word you know is in the file, jump to a page by number, and tap a figure reference to see whether it goes there and back.
4. Change contrast, dark mode or a rendering filter, and note what the platform will not change on a fixed page.
5. If you annotate, highlight one line, write one note, export it the documented way, and open the result on your computer.

What changed this week

The new Kindle Paperwhite and Kindle Colorsoft announced on the first of October have not shipped. They are still on pre-order, with shipping set to begin on the twenty-eighth of October. The new base Kindle is the only one of the three you can hold today. If either of those two is on your short list, the document test above cannot be run on them yet. Anything you read about their PDF handling is an announcement, not something an owner has checked.

The Boox Picco has not shipped either. Pre-orders opened on the twenty-eighth of September, and units remain in "preparing for shipping" with delivery aimed at late October to November. It is still not testable. That matters for this chapter, because the Picco runs Boox's own lightweight firmware rather than Android, so NeoReader's PDF tools cannot be assumed to be there.

Two firmware updates touch what was covered above. Kindle software version five point twenty point one arrived around the sixth of October for the Kindle Scribe and devices from 2024 on. It adds voice dictation for searches, notebook titles and typed notes on supported hardware, and on the Scribe it adds handwritten sticky notes on fixed-layout books and documents. If you own a Scribe, check whether the update has installed, then put a handwritten sticky note on a test PDF and run the export step again, since its form is what matters. Boox software version four point three was announced on the eighth of October and is rolling out in stages. It adds side-by-side notebooks, writing gestures for undo and redo, and its meeting transcription feature in the United States, Canada, Japan and Australia. Those are writing features more than reading ones, and nothing yet shows they change how a PDF is handled.

There was no change to library borrowing on Kindle, Kobo or Android this week, so Nadia's three-step access check stands as it was.

The one thing to do today is the hardest document you own. Find it, copy it somewhere you can reach from a shop or a new device, and decide which of the five checks it has to pass before any screen gets your money.