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RIOT (Radical Image Optimization Tool) presents a before-and-after image compression view that allows you to reduce file size of an image into JPG, PNG, or GIF format. Includes optional metadata removal, batch operations, compression to a target file size, transparency options, and other common editing functions (flip, rotate, zoom, pan). Notable versus similar software in the ability to gradually reduce the available colors one-by-one (7, 8, 9, 10...), not just milestones of 16, 32, 64, etc.

The program is also available as a plugin for XnView, GIMP, or Irfanview (see website).

Functional in Linux using Wine. Many of the official entries here on PortableFreeware have used RIOT for compression. Note that the installer version of this program is considered adware.

FileOptimizer is a broad format file compression tool used to reduce file size without changing the quality, known as "lossless." This is done via wide variety of optimization and recompression tools and techniques. Original files are sent to the recycle bin for restoration in the event the uncompressed version is preferred. A long list of supported formats include audio/video (MP3, OGG, M4A), image (GIF, JPEG, PNG), office formats (DOCX, XLSX, ODT, PDF) and system files (DLL, EXE).

Supports drag-and-drop of files into the window or onto the program icon. Note that by default the program removes metadata for many file types. This information reduces overall file size and protects privacy but is important to some users (e.g. photographers) and file search tools.

A 64-bit version is available within the folder, the author reports the program is functional in WINE, and can be used on the command line.

Notepad++ is a tabbed source code editor and Notepad replacement with a customizable interface. Includes source code "folding", allowing users to quickly reduce and expand sections of code to see the overall document. In addition, it features multi-language syntax highlighting, auto-completion, Perl-compatible regular expression search/replace, macro recording and playback, document map etc. The program can access a long list of plug-ins via an easy-to-access menu with even more features and functions.

Alternatively, X-Notepad++ and Notepad++ Portable clean the local folder.

UltraDefrag manages file fragmentation on to improve file access time and overall system speed of magnetic (non-SSD) drives. The program includes quick and full defragmentation modes for frequent or occasional (usually monthly) optimization on NTFS, FAT and exFAT-formatted drives. The program is optimized for efficiency and speed versus other available tools and can be paused mid-defrag. See FAQ for usage suggestions.

Supports over 40 world languages and includes a command-line version.

Alternatively, UltraDefrag Portable switches automatically between the 32/64-bit versions and cleans up the fragmentation details left behind on drives.