StuffIt is a discontinued family of computer software utilities for archiving and compressing files. Originally produced for Macintosh, versions for Microsoft Windows, Linux (x86), and Sun Solaris were later created.[1][2] The proprietary compression format used by the StuffIt utilities is also termed StuffIt.
In December 2019, Smith Micro Software, the product's most-recent owner and developer, officially announced that StuffIt had reached its end-of-life and that StuffIt products would no longer be developed.[3] One last update did come out in December 2020 after the launch of the Apple M1 architecture to support that and Intel Mac systems through a universal binary of the program.
StuffIt was originally developed in the summer of 1987 by Raymond Lau,[4] who was then a student at Stuyvesant High School in New York City. It combined the fork-combining capabilities of utilities such as MacBinary with newer compression algorithms similar to those used in ZIP. Compared to existing utilities on the Mac, notably PackIt, StuffIt offered "one step" operation and higher compression ratios. By the fall of 1987 StuffIt had largely replaced PackIt in the Mac world, with many software sites even going so far as to convert existing PackIt archives to save more space.[citation needed]
StuffIt soon became very popular and Aladdin Systems was formed to market it (the last shareware release by Lau was version 1.5.1). They split the product line in two, offering StuffIt Classic in shareware and StuffIt Deluxe as a commercial package. Deluxe added a variety of additional functions, including additional compression methods and integration into the Mac Finder to allow files to be compressed from a "Magic Menu", or seamlessly browse inside and edit compressed files without expanding them using "True Finder Integration".Archived 2013-02-22 at the Wayback Machine
StuffIt was upgraded several times, and Lau removed himself from direct development as major upgrades to the "internal machinery" were rare. Because new features and techniques appeared regularly on the Macintosh platform, the shareware utility Compact Pro emerged as a competitor to StuffIt in the early 1990s.[citation needed]
A major competitive upgrade followed, accompanied by the release of the freeware StuffIt Expander, to make the format more universally readable, as well as the shareware StuffIt Lite which made it easier to produce. Prior to this anyone attempting to use the format needed to buy StuffIt, making Compact Pro more attractive. This move was a success, and Compact Pro subsequently fell out of use.
Several other Mac compression utilities appeared and disappeared during the 1990s, but none became a real threat to StuffIt's dominance. The only ones to see any widespread use were special-purpose "disk expanders" like DiskDoubler and SuperDisk!, which served a different niche. Apparently as a side-effect, StuffIt once again saw few upgrades. The file format changed in a number of major revisions, leading to incompatible updates. PC-based formats long surpassed the original StuffIt format in terms of compression, notably newer systems like RAR and 7z. These had little impact on the Mac market, as most of these never appeared in an easy-to-use program on the Mac.[citation needed]
With the introduction of Mac OS X, newer Mac software lost their forks and no longer needed anything except the built-in Unix utilities like gzip and tar. Numerous programs "wrapping" these utilities were distributed, and since these files could be opened on any machine, they were considerably more practical than StuffIt in an era when most data is cross-platform. With the release of OS X Public Beta, Aladdin Systems released StuffIt 6.0 which runs under OS X.
Although it was late to market, Aladdin Systems introduced the completely new StuffIt X format in September 2002 with StuffIt Deluxe 7.0 for Macintosh. It was designed to be extendable, support more compression methods, support long file names, and support Unix and Windows file attributes. StuffIt X improves over the original StuffIt format and its descendants by adding multiple compression algorithms such as PPM, and BWT to LZW-type compression. It also added a "block mode" option, error correcting "redundancy" options to protect against data loss, and several encryption options. In January 2005, JPEG compression was added as a StuffIt X compression option (see the related 'SIF Format' below).
From the mid-1990s until the 2005 acquisition by Smith Micro Software, coinciding with the release of Mac OS X v10.4 "Tiger," StuffIt Expander came bundled with the Macintosh operating system.
Although Mac files generally did not use filename extensions, one of StuffIt's primary uses was to allow Mac files to be stored on non-Mac systems where extensions were required. So, StuffIt-compressed files save the resource forks of the Macintosh files inside them, and typically have the extension .sit. Newer (non-backwards compatible) Stuffit X-compressed files carry the file extension .sitx. Encrypted StuffIt archives created with the now-discontinued Private File utility will have .pf extensions. StuffIt-compressed ShrinkWrapdisk images will carry .img or .image extensions. However, a Classic Mac OS version of StuffIt is needed to mount the images or convert them to a newer format readable in macOS.
Smith Micro Software offers free downloads of StuffIt Expander for Mac and Windows, which expands (uncompresses) files compressed using the StuffIt and StuffIt X format, as well as many other compressed, encoded, encrypted and segmented formats. The shareware application DropStuff permits the compressing of files into the StuffIt X format.
The StuffIt and StuffIt X formats remain, unlike some other file compression formats, proprietary, and Smith Micro Software charge license feesArchived 2007-12-27 at the Wayback Machine for its use in other programs. Given this, few alternative programs support the format.
There was also a "self-expanding" variant of StuffIt files with a .sea extension that runs as an executable. A utility called unsea exists to turn such an executable into a vanilla sit file.[5]
Derivative products
StuffIt Image Format (SIF)
Early in 2005, a new JPEG compression system was released that regularly obtained compression in the order of 25%[6] (meaning a compressed file size 75% of the original file size) without any further loss of image quality and with the ability to rebuild the original file, not just the original image. (ZIP-like programs typically achieve JPEG compression rates in the order of 1 to 3%. Programs that optimize JPEGs without regard for the original file, only the original image, obtain compression rates from 3 to 10% (depending on the efficiency of the original JPEG). Programs that use the rarely implemented arithmetic coding option available to the JPEG standard typically achieve rates around 12%.)
The new technique was implemented as a StuffIt X format option in their StuffIt Deluxe product. They have also proposed a new image format known as SIF, which simply consists of a single JPEG file compressed using this new technique.
Pending filing of their patent, they retain knowledge of the details of this algorithm as a trade secret. Some details are disclosed in:[7] the high JPEG recompression is achieved by undoing the last step of the JPEG compression itself (the Huffman encoding of quantized transform coefficients). Instead, the transform coefficients are compressed by a more efficient algorithm (a predictive model based on the DC coefficients of neighboring blocks). Similar techniques are also applied for other image file formats such as GIF and TIFF and even the MP3 music file format. By means of decomposition, the relatively high compression rates for individual file formats can also be achieved for container file formats such as PDF, PSD and even ZIP.
StuffIt Wireless
On July 5, 2005, Smith Micro Software announced their acquisition and intention to expand the new JPEG recompression technique to wireless platforms and other file formats. The initial press release and preliminary information saw the first use of the title “StuffIt Wireless.”
StuffIt Expander
StuffIt Expander is a proprietary, freeware, closed source, decompression software utility developed by Allume Systems (a subsidiary of Smith Micro Software formerly known as Aladdin Systems). It runs on the classic Mac OS, macOS, and Microsoft Windows. Prior to 2011, a Linux version had also been available for download.
Duplicate Folding is a feature which saves even more space by only keeping one copy of a duplicate file in an archive. [8][9][10][11]
Issues
Backwards compatibility
Changes to the Stuffit compression format render previous versions of Stuffit or software using its API unable to decompress newer archives, necessitating installation of new versions. This incompatibility can be inconvenient for work flows where timely execution is of importance, or where the intended recipient's system is not capable of running newer versions of Stuffit. Though users are able to create archives in a legacy format, this functionality is not clearly exposed.[12]
Alternatives
macOS includes Archive Utility which decompresses the legacy open formats ZIP, GZIP, and BZIP2, and creates ZIP. In versions since 10.3 (Panther), it now preserves resource forks in the ZIP format, so Stuffit is no longer a requirement for Mac file compression. ZIP is also a de facto standard, making it more widely accepted for archives and sharing.
While StuffIt used to be a standard way of packaging Mac software for download, macOS native compressed disk images (DMG) have largely replaced this practice.
StuffIt might still be used in situations where its specific features are required (archive editing/browsing, better compression, JPEG compression, encryption, old packages). An open source alternative might be The Unarchiver, even if it doesn't support the last versions of the StuffIt file formats.[13] Some 3rd-party software, such as the Macintosh Finder replacement Path Finder, use the licensed Stuffit SDK to gain all the features of Stuffit.
ZIP is an archive file format that supports lossless data compression. A ZIP file may contain one or more files or directories that may have been compressed. The ZIP file format permits a number of compression algorithms, though DEFLATE is the most common. This format was originally created in 1989 and was first implemented in PKWARE, Inc.'s PKZIP utility, as a replacement for the previous ARC compression format by Thom Henderson. The ZIP format was then quickly supported by many software utilities other than PKZIP. Microsoft has included built-in ZIP support in versions of Microsoft Windows since 1998 via the "Plus! 98" addon for Windows 98. Native support was added as of the year 2000 in Windows ME. Apple has included built-in ZIP support in Mac OS X 10.3 and later. Most free operating systems have built in support for ZIP in similar manners to Windows and macOS.
RAR is a proprietary archive file format that supports data compression, error correction and file spanning. It was developed in 1993 by Russian software engineer Eugene Roshal and the software is licensed by win.rar GmbH. The name RAR stands for Roshal Archive.
System 7, codenamed "Big Bang", and renamed Mac OS 7 since version 7.6, is the main operating system for Macintosh computers from Apple Computer. It succeeded System 6 upon launch on May 13, 1991, and new features since then include virtual memory, personal file sharing, QuickTime, QuickDraw 3D, and an improved user interface.
PICT is a graphics file format introduced on the original Apple Macintosh computer as its standard metafile format. It allows the interchange of graphics, and some limited text support, between Mac applications, and was the native graphics format of QuickDraw.
StuffIt Expander is a proprietary, freeware, closed source, decompression software utility developed by Allume Systems. It runs on the classic Mac OS, macOS, and Microsoft Windows. Prior to 2011, a Linux version had also been available for download.
The following tables compare general and technical information for a number of file archivers. Please see the individual products' articles for further information. They are neither all-inclusive nor are some entries necessarily up to date. Unless otherwise specified in the footnotes section, comparisons are based on the stable versions—without add-ons, extensions or external programs.
ARC is a lossless data compression and archival format by System Enhancement Associates (SEA). The file format and the program were both called ARC. The format is known as the subject of controversy in the 1980s, part of important debates over what would later be known as open formats.
Allume Systems was a software developer, founded in 1988 by David Schargel and Jonathan Kahn in New York City as Aladdin Systems to develop, publish and distribute software for personal computers. Aladdin Systems was incorporated in January 1989.
Disk Copy was the default utility for handling logical volume images in System 7 through Mac OS X 10.2. In later versions of macOS it has been replaced by DiskImageMounter for mounting the images and Disk Utility for creating them.
PowerArchiver is a proprietary file archiver for Microsoft Windows and MacOS, developed by ConeXware Inc. It supports creating and reading ZIP, 7z, and Tar archive formats, as well as various disk image formats. Additionally, it can read RAR and ACE files. The evaluation version of the program remains functional for 40 days. Personal licenses are currently permitted free lifetime updates to all future versions of the software, while the business license is valid through two major versions.
Compact Pro is a software data compression utility for archiving and compressing files on the Apple Macintosh platform. It was a major competitor to StuffIt in the early 1990s, producing smaller archives in less time, able to create self-extracting archives without the use of an external program, as well as being distributed via shareware which greatly helped its popularity. A PC version was also available, ExtractorPC. Neither program is actively supported.
PackIt is a software data compression utility for archiving and compressing files on the Apple Macintosh platform. It was the first such program to see widespread use on the Mac, and most Mac software archives accepted uploads only in PackIt format for some time. StuffIt, introduced in the summer of 1987, offered much improved compression, and PackIt quickly disappeared.
DiskDoubler (DD) is a data compression utility for compressing files on the classic Mac OS platform. Unlike most such programs, which compress numerous files into a single archive for transmission, DiskDoubler compresses single files "in place" to save space on the drive. When a compressed file is opened, DiskDoubler decompresses the file before handing it off to the application for use. A later addition, AutoDoubler, adds background compression, finding and compressing files automatically when the computer is idle.
Amiga software is computer software engineered to run on the Amiga personal computer. Amiga software covers many applications, including productivity, digital art, games, commercial, freeware and hobbyist products. The market was active in the late 1980s and early 1990s but then dwindled. Most Amiga products were originally created directly for the Amiga computer, and were not ported from other platforms.
A Uniform Type Identifier (UTI) is a text string used on software provided by Apple Inc. to uniquely identify a given class or type of item. Apple provides built-in UTIs to identify common system objects – document or image file types, folders and application bundles, streaming data, clipping data, movie data – and allows third party developers to add their own UTIs for application-specific or proprietary uses. Support for UTIs was added in the Mac OS X 10.4 operating system, integrated into the Spotlight desktop search technology, which uses UTIs to categorize documents. One of the primary design goals of UTIs was to eliminate the ambiguities and problems associated with inferring a file's content from its MIME type, filename extension, or type or creator code.
The Unarchiver is a proprietary freeware data decompression utility, which supports more formats than Archive Utility, the built-in archive unpacker program in macOS. It can also handle filenames in various character encodings, created using operating system versions that use those character encodings. The latest version requires Mac OS X Lion or higher. The Unarchiver does not compress files.
AppleDisk Image is a disk image format commonly used by the macOS operating system. When opened, an Apple Disk Image is mounted as a volume within the Finder.
ZipIt is a shareware data compression utility for archiving and compressing files on the Classic Mac OS and Mac OS X platforms. It was designed to be highly compatible with PKZIP on MS-DOS machines, reading and writing those files as well as performing any necessary line ending conversion or MacBinary encoding to ensure the files were usable on both platforms. It had an advanced user interface and offered a number of automation features, including AppleScript support. First released in 1993, the latest version of ZipIt is version 2.2.2, released in late 2002.
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