From 5 KB to a Library in Your Pocket: How eBooks Changed Access to Knowledge
Before the eBook, there was a very expensive computer
Today, downloading a book takes seconds. In 1971, putting one online meant a mainframe, a 15-node network—and a storage system that cost $1,500.
Michael S. Hart, then an undergraduate at the University of Illinois at Urbana-Champaign, had access to a Xerox Sigma V mainframe connected to ARPANET, the fledgling network that preceded the internet.
His idea was simple: type a book into the computer and make it available to others.
So he chose the U.S. Declaration of Independence.
That became eBook #1 of Project Gutenberg.
It was hardly a sleek digital reading experience. The removable disk pack was about the size of a large cake in a cake carrier—and the computer couldn't even display lowercase letters. The first eBook was therefore ALL CAPS, stored on hardware that sounds almost prehistoric by today's standards.
Yet the clunky experiment contained a radical idea:
Once a book became information a computer could store and distribute, its physical location no longer had to determine who could access it.
More than five decades later, that idea lives quietly in the eBooks we download, the digital libraries we browse and the reading apps we open without a second thought.
Why Hart Turned Computer Time into Books?
Hart wasn't trying to launch an eBook industry. He simply had something almost as unusual as his idea:
A huge amount of computer time to use.
The Declaration of Independence he digitised contained roughly 1,300 words. In plain ASCII, that text would reasonably amount to around 5–8 KB—but that's an estimate, not Hart's recorded file size.
What Hart did record was the amount of storage it occupied:
About 1–2% of a 5 MB disk pack.
That puts the stored file at roughly 50–100 KB, although the figure reflects the way the text was stored on that system rather than the raw text alone.
Then came another seemingly mundane choice that would prove important:
Plain ASCII text.
Hart's “Plain Vanilla ASCII” approach prioritised compatibility and durability. A simple text file could be read across different computers and software without depending on a particular operating system or word processor.
In other words, Hart wasn't merely digitising a book. He was already grappling with a question that still matters today:
How do you make digital information last—and remain usable as technology changes?
But did Hart actually invent the eBook?
This is where eBook history needs a little precision. The idea of an electronic library predates Hart.
In 1945, Vannevar Bush imagined the Memex, a hypothetical machine that could store a personal library and connect documents through “associative trails.” It was never built, and its proposed system relied on microfilm rather than digital text.
In 1965, Ted Nelson coined the term “hypertext” and developed ideas for a universal, linked publishing system through Project Xanadu.
Both were important conceptual precursors. But neither produced the first digital book.
Hart's contribution was different. In 1971, he turned a text into a digital file, stored it on a computer and made it available through a computer network.
The dream of an electronic library came first. The file came later.
And that distinction matters. Bush imagined a new way of storing and connecting knowledge. Nelson developed the language and concepts for linked information. Hart demonstrated that a book could become a digital file that could actually be distributed.
That tiny experiment would eventually grow into the digital libraries, eBooks and reading platforms we now take for granted.
The Strange Early Life of the eBook
However, the eBook industry did not arrive with the 1971 ebook.
For decades, digital books existed in an awkward middle ground:
Too electronic to behave like books, too primitive to be convenient, and too fragmented to reach a mass audience.
First came plain text.➡️ Then fixed-layout documents. ➡️Then dedicated e-readers, electronic paper, open standards, wireless downloads, tablets and, eventually, accessibility standards.
Each step changed not just the technology, but who could get a book, where they could get it, and how they could read it.
Year | What happened? | Why it mattered? |
1971 | Michael S. Hart digitises the U.S. Declaration of Independence, creating eText #1 of Project Gutenberg. | The book became a computer file that could be copied and distributed electronically. It also established the idea of freely sharing public-domain texts at scale. |
1993 | Adobe launches the Portable Document Format (PDF), developed from John Warnock's earlier Camelot Project. | Digital documents could preserve their page appearance across different computers. PDF became the fixed-layout counterpart to the simpler, text-based files of the early Project Gutenberg era. |
1998 | Rocket eBook and SoftBook Reader appear, while eBooks begin entering commercial and library ecosystems. | The eBook started to look like a product that could be bought, borrowed and read as a book, rather than simply downloaded as a computer file. |
1999–2007 | The Open eBook (OEB) standard emerges; its development eventually leads to EPUB, formally released in 2007. | The industry began moving towards a common, interoperable format instead of forcing readers into incompatible proprietary systems. |
2004 | Sony launches the Librié, one of the earliest dedicated e-readers using E Ink. | Electronic paper made extended digital reading more book-like, reducing the dependence on conventional backlit displays. |
2007 | Amazon launches the Kindle; EPUB is also formally released. | Wireless book delivery and dedicated hardware brought digital reading much closer to mainstream consumer use. |
2010–2011 | Apple launches the iPad; EPUB 3.0 arrives with support for richer web-based content. | Reading moved beyond dedicated e-readers to multipurpose phones and tablets, while EPUB gained capabilities for more structured and interactive publications. |
2012 | U.S. trade eBooks reach roughly 22–23% of publisher net revenue, compared with about 1% in 2008. | The eBook had moved from technological experiment to a major commercial format. |
2013 | WIPO adopts the Marrakesh Treaty, facilitating cross-border exchange of accessible-format books for people who are blind, visually impaired or otherwise print-disabled. | Digital books became part of an international effort to address accessibility as a legal and practical access problem, not merely a technical one. |
2017 | The International Digital Publishing Forum (IDPF) merges with the W3C. | EPUB development became more closely connected with the standards ecosystem governing the Web, including accessibility-related standards and practices. |
2023 | EPUB 3.3 becomes a W3C Recommendation, alongside EPUB Accessibility 1.1. W3C describes accessibility as an integral part of the EPUB standard. | Accessibility moved much closer to the centre of digital publishing: structure, semantics and assistive-technology support became part of the standards conversation, rather than an afterthought. |
2024 | OverDrive's global library and school network records 739.5 million digital checkouts, including 366.2 million eBooks. | Digital reading had become not merely something people purchased, but something millions could borrow through libraries and schools. |
Note: The eBook did not become transformative because someone invented a smaller screen. It became transformative because access kept getting easier.
And accessibility standards increasingly asked a more important question:
Can more people actually use the book?
From Experiment to Ecosystem: eBook Growth and the Access Divide
By the 2000s, the eBook had stopped being a computer experiment and started behaving like an industry.
In the U.S., eBooks rose from roughly 1% of trade-publishing revenue in 2008 to 17% in 2011 and about 22.5–23% in 2012. After that early boom, their revenue share plateaued rather than continuing to climb indefinitely. Meanwhile, estimated U.S. eBook unit sales grew from about 69 million in 2010 to 191 million in 2020.
The global numbers are harder to pin down. Different market researchers produce substantially different estimates because they count different things. For 2025–26, published estimates range from roughly $15 billion to $23 billion.
So one number does not tell the whole story. The more revealing question is: how did eBooks change access?
The eBook Access Divide
Access layer | What changed | Evidence / indicator | What it still doesn't solve |
Availability | Millions more texts can exist as digital copies. | Project Gutenberg: 1 title (1971) → ~78,000 (2026). | Mostly public-domain material; current books may remain unavailable digitally. |
Affordability | Digital distribution removes printing, storage and much physical distribution. | eBook prices and licensing vary widely by publisher and market. | Digital does not automatically mean cheaper. |
Geographical access | A reader can obtain a legitimate digital book without visiting a bookstore or library. | Commercial eBook catalogues expanded from tens of thousands of titles in the late 2000s to millions later in the decade. | Requires a device and a way to connect. |
Digital access | Books can travel through the internet rather than through physical supply chains. | eBooks became a substantial share of U.S. trade revenue by 2011–12. | Connectivity, electricity, devices, data costs and digital literacy remain barriers. |
Institutional access | Libraries can lend digital books beyond the physical shelf. | OverDrive recorded 739.5 million digital checkouts in 2024, including 366.2 million eBooks. | Licensing restrictions and catalogue availability still affect what libraries can lend. |
Accessibility | Reflowable, structured formats can support adjustable text and assistive technologies. | EPUB 3.3 and EPUB Accessibility became W3C standards in 2023. | A digital file can still be inaccessible if poorly structured or scanned. |
India | Digital repositories can widen access to educational and research material. | National Digital Library of India (NDLI) aggregates resources from participating institutions. | Device access, connectivity, language and digital literacy still shape who benefits. |
The pattern is clear: eBooks did not remove the access divide; they moved it.
The first barrier was finding a book. Then came getting the file. Today, the questions may be:
Can I afford it? Can I connect? Can my device open it? Can I actually use it?
That is why the eBook revolution is better understood not as the replacement of print, but as a gradual expansion of who can reach which books, from where, and in what form.
India’s Digital Reading Story: From Bookshelves to Digital Libraries
The eBook story becomes even more interesting in India, where digital libraries are tackling a problem bigger than convenience:
Who gets access to knowledge in the first place?
The National Digital Library of India (NDLI) brings resources from participating institutions into a searchable digital environment, reducing some of the geographical barriers of physical libraries.
And accessibility has its own remarkable example.
Sugamya Pustakalaya, India's digital library for people with visual and other print disabilities, has grown to more than 650,000 accessible titles.
The National Accessible Library's 2023–24 report records 679,120 titles in its online collection.
That is a striking reminder of what digital publishing can do when access—not just sales—is the goal.
From Hart's single text file in 1971 to national digital repositories and hundreds of thousands of accessible titles, the question has changed.
It is no longer simply:
Can we put a book online?
It is:
Can the right reader find it, reach it and actually read it?
And that may be the real legacy of the eBook.
Happy Read an eBook Day 2026! 📚 What was your first eBook?
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