Documents

Files made to be read: fixed pages ready to print, word processing documents, spreadsheets, presentations, ebooks, plain and marked-up text, and the fonts that display them.

Groups

Page description

Pages laid out exactly, ready to view and print the same everywhere.

2 formats

Word processing

Editable documents of styled text, tables and pictures.

2 formats

Spreadsheets

Workbooks of cells, formulas and charts.

1 format

Presentations

Slide shows with layouts, media and speaker notes.

1 format

Ebooks

Books packaged for reading apps, with text that reflows to fit the screen.

1 format

Text & markup

Plain text, and text with light formatting marks that stay readable as written.

2 formats

Fonts

Typefaces: the outlines of every character and the rules for setting them.

3 formats

All document formats

Format	Name	About
Page description
`.PDF`	Portable Document Format	Fixed pages that look the same everywhere, built from numbered objects.
`.PS`	PostScript	Adobe’s page description language: a program that draws each page.
Word processing
`.DOCX`	Word document	Microsoft Word’s ZIP package of XML parts, standard since Word 2007.
`.RTF`	Rich Text Format	Formatted text written as readable control words, understood by almost every word processor.
Spreadsheets
`.XLSX`	Excel workbook	Microsoft Excel’s ZIP package of sheets, shared strings and styles.
Presentations
`.PPTX`	PowerPoint presentation	PowerPoint’s ZIP package of slides built on layouts and masters.
Ebooks
`.EPUB`	EPUB ebook	The open ebook standard: XHTML chapters and a package document in a ZIP file.
Text & markup
`.MD`	Markdown	Readable plain text with light marks for headings, emphasis, lists and links.
`.TXT`	Plain text	Characters and line endings, nothing more, in an encoding the file rarely names.
Fonts
`.OTF`	OpenType font	The TrueType container extended with PostScript outlines and typographic features.
`.TTF`	TrueType font	Apple’s font format of quadratic outlines and hinting, in a directory of tables.
`.WOFF2`	Web Open Font Format 2	A web font: TrueType or OpenType tables compressed together with Brotli.