Caesium Image Compressor vs XConvert Image Compressor

Caesium Image Compressor reduces digital pictures for storage, sending, and sharing, with desktop and online options. The maker says compression can reach 90% without visible quality loss. Desktop tools include a real-time preview, batch processing, resizing, metadata storage options, and folder structure support. Supported formats are JPG, PNG, WebP, and TIFF; both compression modes are available. The online compressor works without a dedicated download, states images never leave your device, and offers a lossless mode that preserves image quality completely. It accepts up to 10 files at once, with a 20 MB limit per file. Caesium also provides command-line tools for image compression. The free software is listed for Linux, macOS, web, and Windows. The current Windows desktop version is v2.8.5 for Windows 10 build 1809 or later, with installer and portable downloads. The macOS version supports macOS 12 or later. Linux users can compile the source or obtain a third-party build; the project README reports testing on Ubuntu 22.04 and Manjaro.

XConvert Image Compressor is a web-based tool for compressing, resizing, and converting images, with batch processing and API access. It supports formats including JPG, JPEG, JFIF, PNG, WebP, HEIC, AVIF, GIF, BMP, TIFF, ICO, PPM, EPS, and several RAW formats. Images can be uploaded from a computer, Google Drive, or Dropbox. Compression can be combined with conversion to JPG, WebP, AVIF, PNG, or HEIC; metadata controls and Auto Scale are also available. Auto Scale adjusts dimensions to meet a target file size while maximizing quality. Free users can compress images up to 300 MB each, with no per-session file-count cap. Free video conversions are also offered: visitors get 30 daily, and free accounts get 60. Basic costs $4.99 a month or 49.99 USD yearly; Pro costs $9.99 a month or 99.99 USD yearly. The service says uploads use TLS in transit and files are automatically deleted after a few hours. No account is required for the online tool, and an XConvert desktop app supports offline conversion and editing.