StuffIt X File Format

Compress JPG, TIFF, PNG, PowerPoint and More
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No more big problems with big files

Photographers, artists, and designers rejoice! StuffIt makes digital asset management for today’s photographers and artists easier than ever. You value your photos and images and so do we. StuffIt's exclusive patented technology compresses any JPEG image up to 30% without any loss of quality! Fit more of your photos on your hard disk, CDs, DVDs and in email.

Optimized Compressors make Multi-Megapixel JPEGs Smaller, Audio too

StuffIt's compressors are specifically targeted for maximum efficiency with, JPEG, TIFFs, MP3s, PDFs, and Microsoft® Office documents, emails and presentations. Regain gigabytes of space. StuffIt Deluxe's improved image compressor now compresses high-quality graphic and audio files, dramatically reducing the size without compromising their quality.

StuffIt X archive format makes the smallest files

Why the StuffIt format?

There are many software tools available for file compression, but only the StuffIt format provides all of these benefits:

  • Greater compression than zip on standard compression tests which means SMALLER FILES.
  • Compression on JPEG, TIFF and PNG, PowerPoint, and PDF when zip can't.
  • Lossless compression of single or multiple files ensures the integrity of your original files.
  • Variable compression ratios to maximize compression or speed to give you the flexibility to choose the right compression for your project
  • Unicode and two-byte language support to assure broad international support.
  • FREE Expander "client" for Windows, Macintosh, Linux, and Solaris with a large installed base on Mac and Windows.
  • Self-extracting archives for either Windows or Macintosh.

Improved Compression

StuffIt Deluxe's improved image compressor now compresses high-quality TIFF or PNG files. StuffIt dramatically reduces the size of your images without compromising their visual quality. The integrity of your images' data is perfectly preserved during the compression and decompression process. What you get when expanding a StuffIt compressed image is always a pixel-perfect replica of the original version of the file. Whether you're looking to send out a project for review or simply looking to back up your files, StuffIt Deluxe can get both done for you more quickly than ever before.

When you package large images or image collections into a StuffIt X archive, it not only saves space but also makes it easier to transfer these files. StuffIt 's space-saving compression provides 20-30% compression that you can employ at any time while working within your favorite image application, making the tools you use that much more powerful.

Stay flexible, preserve image integrity

StuffIt is smart enough to know when you're working with visuals and knows the difference between a JPEG and a Word .doc. StuffIt’s advanced compression technology saves space with no loss in information quality. Plus, StuffIt automatically ads thumbnails when compressing JPEGs so you can quickly browse through a collection of images without decompressing an archive. With StuffIt, your images are safely preserved, storage-friendly, and quickly mobile whenever you need them, wherever you need them.


StuffIt includes a patented method for making files even smaller called Recompression. Like our JPEG compression, introduced in 2005, Recompression make files smaller by 'disassembling' the structure of the data type and compressing it more efficiently using the StuffIt X format's own compressors. When the item is expanded from the StuffIt X archive, the structure for that particular data type is recreated and the original content restored.

A good example to illustrate this concept is PDF recompression. Internally, a PDF may have embedded text, images, and other multimedia content. With PDF recompression, when adding a PDF file to a StuffIt X archive, the PDF is treated as a container. It is opened and its content is extracted and recompressed into the StuffIt X archive taking advantage of StuffIt's superior compression methods. Upon expansion, a PDF archive is created and the elements from the original PDF are added to it.

This recompression concept also applies to other formats like JPEG, PNG, MP3 and others, that contain compressed information as part of the structure. When preparing to compress your files, the StuffIt pre-sorts the files into types and then based on your settings passes the matching files to special Recompressors. If there isn't a matching Recompressor, or if the matching Recompressor is disabled, use a General compressor.

Bit-perfect vs. Pixel-perfect

StuffIt's Recompressors will always result in output that is a "pixel-perfect" perfect copy of the original source file. There will never be any quality reduction comparing the output to the source material. In some cases you may find that while the output file is "pixel-perfect" it may not be "bit-perfect", meaning that the output file may be slightly larger or smaller than your source file. The content itself is identical, and any ancillary data is never lost - just the bit encoding may sometimes differ.

In the example above, the recreated PDF archive and the original PDF archive will have identical contents, but the order of the contents within the internal structure of the expanded PDF may differ from the original. For most uses, the recreated PDF can be considered identical, but if check-summed, the two files may or may not match. This is commonly referred to as "pixel-perfect". In many cases, the content AND the structure will both be identical. This is commonly referred to as "bit-perfect".

Some formats, such as JPEG, have little variance in the compression used, allowing for a bit-perfect reproduction every time. For other formats, bit-perfectness depends on the data from the original file.

StuffIt X includes custom Recompressors for these file formats:


  • JPEG (.jpg, .jpeg)
  • Note: The JPEG compressor has an additional option: Include Thumbnails. When this option is enabled, a small thumbnail of the image is stored in the archive for quick previewing.
  • Bitmap (.bmp)
  • MP3 (.mp3)
  • WAV (.wav)


  • JPEG lossless (.jls)
  • JPEG 2000 (.j2k)
    Note - recompression is only applied when a j2k file is lossless encoded
  • GIF (.gif)
  • TIFF (.tif, .tiff)
  • Note - Some are recompressed bit-perfectly, depending on how they were originally saved.
  • PSD (.psd)
  • Note - Some are recompressed bit-perfectly, depending on how they were originally saved.
  • PNG (.png)
  • PICT (.pict, .pct)
  • PxM (.pbm, .pgm, .ppm)
  • Note - Some are recompressed bit-perfectly, depending on how they were originally saved.
  • Zip (.zip, .cbz, .docx, .xlsx, .pptx, .odt, .odg, .ods, .odb)
  • PDF (.pdf)

Check each type for which you wish to enable recompression.