PUBLIC MARKS with tag compression

Aims of the standard: While there is a modest increase in compression performance of JPEG 2000 compared to JPEG, the main advantage offered by JPEG 2000 is the significant flexibility of the codestream. The codestream obtained after compression of an image with JPEG 2000 is scalable in nature, meaning that it can be decoded in a number of ways; for instance, by truncating the codestream at any point, one may obtain a representation of the image at a lower resolution, or signal-to-noise ratio – see scalable compression. By ordering the codestream in various ways, applications can achieve significant performance increases. However, as a consequence of this flexibility, JPEG 2000 requires codecs that are complex and computationally demanding. Another difference, in comparison with JPEG, is in terms of visual artifacts: JPEG 2000 only produces ringing artifacts, manifested as blur and rings near edges in the image, while JPEG produces both ringing artifacts and 'blocking' artifacts, due to its 8×8 blocks. French trad: Objectifs de la norme: Bien qu'il y ait une augmentation modeste des performances de compression de JPEG 2000 par rapport à JPEG, le principal avantage offert par JPEG 2000 est la flexibilité significative du flux codé.

With Shrink Me you can reduce your image file sizes without suffering visual quality loss, and thus make your sites and apps faster for your users.

With Shrink Me you can reduce your image file sizes without suffering visual quality loss, and thus make your sites and apps faster for your users.

Better than Gzip Compression with Brotli

Compress JPEG files with a perfect balance in quality and file size.

Kraken is a robust, ultra-fast image optimizer and compressor with best-in-class algorithms. We'll save you bandwidth and storage space and will dramatically improve your website’s load times.

Reduce photo file size by up to 5x, without compromising quality

pngquant is a command-line utility and a library for converting 24/32-bit PNG images to paletted (8-bit) PNGs. The conversion reduces file sizes significantly (often as much as 70%) and preserves full alpha transparency. Generated images are compatible with all modern web browsers, and have better fallback in IE6 than 24-bit PNGs.

Trimage is a cross-platform GUI and command-line interface to optimize image files for websites, using optipng, pngcrush, advpng and jpegoptim, depending on the filetype (currently, PNG and JPG files are supported). It was inspired by imageoptim. All image files are losslessy compressed on the highest available compression levels, and EXIF and other metadata is removed. Trimage gives you various input functions to fit your own workflow: A regular file dialog, dragging and dropping and various command line options.

Compress PNG images with the Force of an Elephant

Un e-mail, tout ce qu'il y a de plus classique, intégré par mes soins, livré dans les temps. Et une heure plus tard, un mail de retour du client. "Mon collègue a un rendu bizarre sur son téléphone", avec une capture d'écran de l'application Mail sous iOS, et effectivement un rendu étrange. Différentes images, censées être sur fond blanc avec du texte dessus, ont une couleur de fond différente.

Advanced lossy compression for PNG images that preserves full alpha transparency.

JPEGmini est un service disponible sur Internet pour réduire le poids de vos images tout en gardant une qualité très proche de l'originale. Le taux de compression peut aller jusqu'à 5 fois sans aucune perte "visible".

FILEminimizer Pictures compresses images to high rates.