![]() You can also use Imagemin by itself as a Node script. ![]() If you use one of these build tools, checkout the codelabs for Imagemin with webpack, gulp, or grunt. To compress the images in the "images/" directory and save them to the same directory, run the following command (overwrites the original files): $ imagemin images/* -out-dir =images Imagemin npm module # Imagemin uses the appropriate plugin based on the image format of the input. The Imagemin CLI works with 5 different plugins: imagemin-gifsicle, imagemin-jpegtran, imagemin-optipng, imagemin-pngquant, and imagemin-svgo. Image Format Lossy Plugin(s) Lossless Plugin(s) JPEG imagemin-mozjpeg imagemin-jpegtran PNG imagemin-pngquant imagemin-optipng GIF imagemin-giflossy imagemin-gifsicle SVG imagemin-svgo WebP imagemin-webp imagemin-webp Imagemin CLI # ![]() These aren't the only plugins available, but they'd all be good choices for your project. The table below lists popular Imagemin plugins. They offer significantly greater filesize savings, and you can customize the compression levels to meet your needs. With -batch, gifsicle will modify the files you specify instead of writing a new file to the standard output. To modify GIF files in place, use the -batch option. If a plugin doesn't mention whether it is "lossy" or "lossless," you can tell by its API: if you can specify the image quality of the output, then it is "lossy."įor most people, lossy plugins are the best choice. gifsicle pic1.gif pic2.gif pic3.gif > animation.gif Use options like -delay, -loopcount, and -optimize to tune your animations. Lossy compression reduces file size, but at the expense of possibly reducing image quality. The most important thing to consider when choosing a plugin is whether it is "lossy" or "lossless." In lossless compression, no data is lost. Popular image formats may have multiple plugins to pick from. Imagemin is built around "plugins." A plugin is an npm package that compresses a particular image format (e.g. Generally, the npm module is the best choice because it offers more configuration options, but the CLI can be a decent alternative if you want to try Imagemin without touching any code. Imagemin is available as both a CLI and an npm module. Imagemin is an excellent choice for image compression because it supports a wide variety of image formats and is easily integrated with build scripts and build tools. Lighthouse currently reports on opportunities to compress images in JPEG format only.
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