Open-source alternatives to Leanify

HTML minifier for Python frameworks (not only Django, despite the name).

csso is a CSS minifier and optimizer that reduces stylesheet file sizes through structural analysis and algebraic transformations. It functions as an abstract syntax tree processor, converting styles into a structured tree to perform deep analysis and semantic-preserving code transformations while maintaining the original visual presentation. The project distinguishes itself through usage-aware optimization, analyzing external HTML markup and class identifiers to prune unused styles and reorganize rules based on actual document usage. It also performs structural refactoring by identifying and

A simple command line tool to minify your HTML, Razor views & Web Forms views

Compresses linked and inline javascript or CSS into a single cached file.

Concatenate files.

Compress CSS files.

Minify HTML.

Minify PNG, JPG, GIF and SVG images.

Minify files with UglifyJS.

imagemin is a Node.js image optimizer and minification tool designed to reduce the storage size of image assets. It functions as a build pipeline asset optimizer that employs both lossy and lossless compression to remove unnecessary metadata and optimize pixel data. The project uses a plugin-based architecture to extend its functionality, loading external modules that handle specific image formats and compression algorithms. This allows the tool to serve as a flexible toolkit for automating image compression within development pipelines. The system covers broad capabilities for web performan

CLI bash script to optimize images in parallel easily and efficiently!

Make ImageOptim, ImageAlpha and JPEGmini part of your automated build process

Make optimisation of images part of your automated build process

Use JavaScript to generate JavaScript

Pipeline is an asset packaging library for Django.

grunt plugin for html compression, using htmlcompressor.jar

A grunt wrapper for CSS Shrink

Minify HTML

html-minifier is a Node.js utility designed to reduce HTML file size by optimizing markup, simplifying document structures, and compressing embedded CSS and JavaScript. It functions as an HTML markup compressor and web document optimizer that removes whitespace, comments, and redundant attributes. The tool distinguishes itself by acting as an embedded asset optimizer, processing content within style and script tags through specialized compression engines. It simplifies the final output by removing optional tags and replacing long doctypes with shorter versions. The project covers a range of

minify HTML responses like some crazy guy

Sharp is a high-performance image processing library for Node.js. It serves as a native extension and wrapper for the libvips framework, providing tools for image resizing, format conversion, and programmatic data manipulation. The project enables the transformation of images into web-friendly formats such as WebP and AVIF while preserving color profiles and alpha channels. It also provides capabilities for generating blank image buffers with specified dimensions and background colors. The library covers a broad range of image manipulation utilities, including rotation, extraction, compositi

UglifyJS is a tool for JavaScript code minification, AST manipulation, and source beautification. Its primary purpose is to reduce the file size of JavaScript source code by removing whitespace and shortening variable names to optimize frontend build assets. The project differentiates itself through its ability to programmatically analyze and transform code using abstract syntax trees. It performs constant folding analysis and conditional compilation to eliminate unreachable or redundant code, and it employs a multi-pass compression pipeline to maximize total file size reduction. The tool pr

Mozjpeg is a high-performance C library for encoding, decoding, and transcoding JPEG images. It serves as a binary-compatible, drop-in replacement for standard JPEG libraries, maintaining existing function signatures to improve compression efficiency without requiring changes to application logic. The library functions as an image optimizer that reduces file sizes through lossless progressive encoding and coefficient optimization. It utilizes trellis-based quantization and SIMD-accelerated processing to optimize the trade-off between visual quality and file size. Its broader capabilities inc

svgcleaner could help you to clean up your SVG files from the unnecessary data.

Minify SVG

Minify PNG, JPEG, GIF and SVG images