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CK Image & PDF Reducer, published by epatels, is a free offline compression tool for Windows designed to shrink image and PDF files directly on the user's PC without uploads, subscriptions, or any data leaving the local machine. The software is currently at version 4.0.2, with eight versions released in total. It serves the file compression and image optimization category, targeting anyone who needs smaller files for email attachments, web publishing, storage savings, or document sharing. The tool works through a drag-and-drop interface: users drop a file onto the window, choose a reduction method, and export the result. Several resizing and compression modes are available, including resizing by percentage to scale both dimensions together, Fix Width or Fix Height options that set one dimension while the other auto-scales to preserve aspect ratio, Compress by Quality to lower JPEG quality for a smaller file size, and Target File Size, which lets users specify a limit such as "under 200 KB" and automatically searches for the best quality and resolution combination that fits. PDF compression is handled by recompressing embedded images via Ghostscript, which is installed separately on first use. Typical use cases include reducing photo collections, preparing documents with strict size limits, compressing scans, and processing HEIC images from iPhones, which the tool reads natively. For heavier workloads, a batch queue allows multiple files to be loaded and processed in a single pass. An optional Windows Explorer right-click menu entry, "Reduce with CK Image & PDF Reducer," streamlines one-off reductions directly from the file manager. Because all processing happens locally, the software suits privacy-conscious users and environments where cloud-based compression services are impractical or prohibited.
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