Oxipng is a multithreaded lossless PNG compression optimizer (CLI and library).
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pngcrush – optimizer for PNG files
Pngcrush is a free and open source optimizer for PNG (Portable Network Graphics) files. It is a command-line tool.
Read morezopflipng – PNG optimisation tool using zopfli
Zopfli Compression Algorithm is a compression library programmed in C to perform very good, but slow, deflate or zlib compression.
Read moreOptiPNG – advanced PNG optimizer
OptiPNG optimizes PNG files, i.e. reduce their size to a minimum, without losing semantic information.
Read morepngquant – command-line utility and a library for lossy compression of PNG images
pngquant is a command-line utility and a library for lossy compression of PNG images.
Read moreLepton – image compression tool and file format
Lepton is a tool and file format for losslessly compressing JPEGs by an average of 22%.
Read moreMozJPEG – Mozilla JPEG Encoder Project
MozJPEG improves JPEG compression efficiency achieving higher visual quality and smaller file sizes at the same time.
Read moreGuetzli – perceptual JPEG encoder
Guetzli is a JPEG encoder that aims for excellent compression density at high visual quality.
Read morehexer – multi-buffer editor for binary files
The hexer utility is a multi-buffer editor for binary files for Unix-like systems that displays its buffer(s) as a hex dump.
Read morehyx – minimalistic hex editor
hyx is a minimalistic but powerful hex editor. It’s written in less than 2,300 lines of C.
Read morehexedit – view and edit hexadecimal files
hexedit is a utility that lets you view and edit files in hexadecimal or in ASCII.
Read moreDHEX – ncurses-based hex editor with diff mode
DHEX is a hex editor. It can be used to alter individual bytes in large files. DHEX is a text-based program that uses ncurses.
Read morehexyl – colored command-line hex viewer
hexyl is a simple hex viewer for the terminal with colored output.
Read moreImHex – hex editor
ImHex is a hex editor. It can display, decode and analyze binary data to reverse engineer their format, extract information or patch values. There’s also a CLI.
Read moreImageMagick – create, edit, compose, or convert bitmap images
ImageMagick is a software suite to create, edit, and compose bitmap images. All manipulations can be achieved through shell commands.
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