noun

EPUB

EE-pub

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EPUB (noun) means an open standard file format for digital books, in which the text reflows to fit whatever screen it is being read on, so that page breaks and line lengths change with the device and the chosen type size. Example: “The library lends most of its titles as EPUB files that open in almost any reading app.”

noun

technical, computing An open standard file format for digital books, in which the text reflows to fit whatever screen it is being read on, so that page breaks and line lengths change with the device and the chosen type size.

"The library lends most of its titles as EPUB files that open in almost any reading app."

"She converted the manuscript to EPUB before uploading it to the store."

technical, computing A single file saved in that format, usually with the extension .epub, containing a book's text, styling and images bundled together in one compressed package.

"The download gave me an EPUB and a PDF of the same guide."

How to use EPUB

Learner’s notes

In plain EnglishA type of file that holds a book you read on a screen, where the words rearrange to fit.

When to use it

Technical but widely understood by readers and authors. Usually written in capitals; the file extension is lower case (.epub).

Memory tip

Say it as one word, "EE-pub", not letter by letter.

Trace the full origin ↓

Easily confused with

PDF → MOBI AZW3 e-reader

Common pairings

EPUB file EPUB format convert to EPUB EPUB 3 download as EPUB

Vocabulary Flow

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C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

C2 · Advanced serendipity Fortunate discoveries made entirely by accident.

Gen Z slang rizz Charm — the ability to attract a romantic interest.

B2 · Intermediate empathy The capacity to share another person’s feelings.

C1 · Advanced nonchalant Casually calm and relaxed; unconcerned.

Internet slang delulu Delusional — believing something against the odds.

Etymology nostalgia Greek nostos “return home” + algos “pain”.

Test yourself on “EPUB” A quick quiz — meaning, synonyms & usage →

Fill the gap

Can you complete this real example?

The library lends most of its titles as _____ files that open in almost any reading app.

Etymology

A shortening of electronic publication.

Origin: English

Synonyms

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e-book format digital book format ebook file reflowable format e-book

Frequently asked questions

What is the difference between EPUB and PDF?

A PDF holds a fixed page layout, so every line and page break stays exactly where the designer put it, whatever you read it on. An EPUB reflows instead: the text rearranges itself to suit the screen and the font size you pick. That makes EPUB more comfortable on a phone or e-reader, while PDF is better when the exact look of a page matters.

Can I read an EPUB on a Kindle?

Modern Kindle software accepts EPUB files sent through Amazon's own delivery service, which converts them into Amazon's internal format on arrival. Older devices and some workflows may need the file converting first with separate software.

Is EPUB owned by a company?

No. EPUB is an open standard, developed by the International Digital Publishing Forum and now maintained by the World Wide Web Consortium. Anyone may implement it without paying a licence fee, which is why so many unrelated reading apps support it.

What is the meaning of EPUB?

"EPUB" (noun) means an open standard file format for digital books, in which the text reflows to fit whatever screen it is being read on, so that page breaks and line lengths change with the device and the chosen type size.