Preview is the built-in

image viewer An image viewer or image browser is a computer program that can display stored graphical images; it can often handle various graphics file formats. Such software usually renders the image according to properties of the display such as color depth ...

and PDF viewer of the

iOS Ios, Io or Nio (, ; ; locally Nios, Νιός) is a Greek island in the Cyclades group in the Aegean Sea. Ios is a hilly island with cliffs down to the sea on most sides. It is situated halfway between Naxos and Santorini. It is about long an ...

iPadOS iPadOS is a mobile operating system developed by Apple for its iPad line of tablet computers. It was given a name distinct from iOS, the operating system used by Apple's iPhones to reflect the diverging features of the two product lines, suc ...

macOS macOS, previously OS X and originally Mac OS X, is a Unix, Unix-based operating system developed and marketed by Apple Inc., Apple since 2001. It is the current operating system for Apple's Mac (computer), Mac computers. With ...

operating system. In addition to viewing and printing

digital image A digital image is an image composed of picture elements, also known as pixels, each with '' finite'', '' discrete quantities'' of numeric representation for its intensity or gray level that is an output from its two-dimensional functions f ...

s and

Portable Document Format Portable document format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating syste ...

(PDF) files, it can also edit these media types. It employs the Aqua graphical user interface, the

Quartz Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The Atom, atoms are linked in a continuous framework of SiO4 silicon–oxygen Tetrahedral molecular geometry, tetrahedra, with each oxygen being shared between two tet ...

graphics layer, and the ImageIO and

Core Image Core Image is a pixel-accurate, near-realtime, non-destructive image processing technology in Mac OS X. Implemented as part of the QuartzCore framework of Mac OS X 10.4 and later, Core Image provides a plugin-based architecture for applying filt ...

frameworks.

History

Like macOS, Preview originated in the

NeXTSTEP NeXTSTEP is a discontinued object-oriented, multitasking operating system based on the Mach kernel and the UNIX-derived BSD. It was developed by NeXT, founded by Steve Jobs, in the late 1980s and early 1990s and was initially used for its ...

operating system by

NeXT NeXT, Inc. (later NeXT Computer, Inc. and NeXT Software, Inc.) was an American technology company headquartered in Redwood City, California that specialized in computer workstations for higher education and business markets, and later develope ...

, where it was part of every release since 1989. Between 2003 and 2005,

Apple An apple is a round, edible fruit produced by an apple tree (''Malus'' spp.). Fruit trees of the orchard or domestic apple (''Malus domestica''), the most widely grown in the genus, are agriculture, cultivated worldwide. The tree originated ...

claimed Preview was the "fastest PDF viewer on the planet."

Supported file types

Preview can open the following file types. * AI – Adobe Illustrator artwork files (if PDF content included in file) * BMP – Windows bitmap files * CR2 – Raw image file used by Canon cameras * DAE – Collada 3D files * DNG – Digital negative files *

FAX Fax (short for facsimile), sometimes called telecopying or telefax (short for telefacsimile), is the telephonic transmission of scanned printed material (both text and images), normally to a telephone number connected to a printer or other out ...

– Faxes * FPX – FlashPix files *

GIF The Graphics Interchange Format (GIF; or , ) is a Raster graphics, bitmap Image file formats, image format that was developed by a team at the online services provider CompuServe led by American computer scientist Steve Wilhite and released ...

– Graphics Interchange Format files * HDR – High-dynamic-range image files * ICNS – Apple Icon Image files * ICO – Windows icon files *

JPEG JPEG ( , short for Joint Photographic Experts Group and sometimes retroactively referred to as JPEG 1) is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography. The degr ...

– Joint Photographic Experts Group files *

JPEG 2000 JPEG 2000 (JP2) is an image compression standard and coding system. It was developed from 1997 to 2000 by a Joint Photographic Experts Group committee chaired by Touradj Ebrahimi (later the JPEG president), with the intention of superseding their ...

– JPEG 2000 files * OBJ – Wavefront 3D file *

OpenEXR OpenEXR is a high-dynamic range, multi-channel raster file format, released as an open standard along with a set of software tools created by Industrial Light & Magic (ILM), under a free software license similar to the BSD license. It is notab ...

– OpenEXR files *

PDF Portable document format (PDF), standardized as ISO 32000, is a file format developed by Adobe Inc., Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, computer hardware, ...

– Portable Document Format version 1.5 + some additional features *

PICT PICT is a graphics file format introduced on the original Apple Macintosh computer as its standard metafile format. It allows the interchange of graphics (both bitmapped and vector), and some limited text support, between Mac applications, an ...

–

QuickDraw QuickDraw was the 2D graphics library and associated application programming interface (API) which is a core part of classic Mac OS. It was initially written by Bill Atkinson and Andy Hertzfeld. QuickDraw still existed as part of the libraries ...

image files * PNG – Portable Network Graphics files * PPM – Netpbm Color Image files * PNTG – MacPaint Bitmap Graphic files * PPT – PowerPoint files * PSD – Adobe Photoshop files * QTIF – QuickTime image files * RAD – Radiance 3D Scene Description files * RAW – Raw image files * SGI – Silicon Graphics Image files * STL – STereoLithography 3D format * TGA – TARGA image files * TIF (TIFF) – Tagged Image File Format files * XBM – X BitMap files In

macOS Monterey macOS Monterey (version 12) is the eighteenth major release of macOS, Apple's desktop operating system for Macintosh computers. The successor to macOS Big Sur, it was announced at WWDC 2021 on June 7, 2021, and released on October 25, 2021. ...

and earlier, Preview supported the display of

EPS An extended play (EP) is a Sound recording and reproduction, musical recording that contains more tracks than a Single (music), single but fewer than an album. Contemporary EPs generally contain up to eight tracks and have a playing time of 1 ...

and

PostScript PostScript (PS) is a page description language and dynamically typed, stack-based programming language. It is most commonly used in the electronic publishing and desktop publishing realm, but as a Turing complete programming language, it c ...

documents using on-the-fly conversion to PDF format. However, this functionality was removed in

macOS Ventura macOS Ventura (version 13) is the nineteenth major release of macOS, Apple's operating system for Macintosh computers. The successor to macOS Monterey, it was announced at WWDC 2022 on June 6, 2022, and launched on October 24, 2022. macOS V ...

, although users can continue to print and files by dragging them into the printer queue. The version of Preview included with OS X 10.3 (''Panther'') could play animated GIF images, for which an optional button could be added to the toolbar. As of OS X 10.4 (''Tiger''), Preview lost playback functionality and animated GIF files are displayed as individual frames in a numbered sequence.

Features

Editing PDF documents

Preview can encrypt PDF documents, and restrict their use; for example, it is possible to save an encrypted PDF so that a password is required to copy data from the document, or to print it. However, encrypted PDFs cannot be edited further, so the original author should always keep an unencrypted version. A new "edit button" where the picture can be edited is introduced in Version 7. The "edit button" allows options to insert shapes, lines, do cropping, and among other things. Some features which are otherwise only available in professional PDF editing software are provided by Preview: It is possible to extract single pages out of multi-page documents (e.g. PDF files), sort pages, and drag & drop single or multiple pages between several opened multi-page documents, or into other applications, such as attaching to an opened email message.

Editing images

Preview offers basic image correction tools using

processing technology implemented in macOS, and other features like shape extraction, color extraction, cropping, and rotation tools. When annotating images, Preview uses vector shapes and text until the image is rasterized to JPEG, PNG or another bitmap format.

and image documents can also be supplied with keywords, and are then automatically indexed using macOS's system-wide Spotlight search engine.

Import and export

Preview can directly access image scanners supported by macOS and import images from the scanner. Preview can convert between image formats; it can export to BMP, JP2, JPEG, PDF, PICT, PNG, SGI, TGA, and TIFF. Using macOS's print engine (based on

CUPS CUPS (formerly an acronym for Common UNIX Printing System) is a modular printing system for Unix-like computer operating systems which allows a computer to act as a print server. A computer running CUPS is a host that can accept print jobs ...

) it is also possible to "print into" a Postscript file, a PDF-X file or directly save the file in

iPhoto iPhoto is a discontinued image editing software application developed by Apple Inc. for use on its Mac OS X operating system. It was included with every Mac computer from 2002 to 2015, when it was replaced with Apple's Photos application in ...

, for example scanned photos. Beginning with Mac OS X 10.7 Lion, Preview restricts the Format option popup menu in the Save As dialog to commonly used types. It is possible to access the full format list by holding down the Option key when clicking the Format popup menu. (GIF, ICNS, JPEG, JPEG-2000, Microsoft BMP, Microsoft Icon, OpenEXR, PDF, Photoshop, PNG, SGI, TGA, TIFF.)

References

External links

'Mac Basics: Preview app views and edits images and PDFs'AppleInsider review
from 2003 *MacProNews article: from July 2004 *Sams Publishin
sample chapter on Preview
from ''Mac OS X Panther Applications and Utilities''. Includes some instructions for use, with screenshots. {{DEFAULTSORT:Preview (Software) Image viewers PDF readers MacOS