Fast PDF Compressor — shrink PDF files on your own machine, no cloud, no upload. WHY ANOTHER PDF COMPRESSOR? Most PDF compressors upload your document to a third-party server, wait in a queue, and ask for a subscription. Fast PDF Compressor does the real work right on your PC: it opens your PDF, recompresses every stream with a modern DEFLATE engine, re-encodes embedded images at the quality you choose, and writes a fresh, fully valid PDF next to your original. Nothing ever leaves your computer — private documents stay private. KEY CAPABILITIES ★ One-click compression — open or drop a PDF and go. Your file is checked first so you always know if there is anything to save. ★ Three quality levels — High Quality (best image fidelity, JPEG q85), Medium (balanced, JPEG q70), or Maximum Compression (smallest files, JPEG q55 with images downscaled to 1536px). ★ Compressibility check — before you run, Fast PDF Compressor scans the document and tells you if it can be shrunk or if it is already optimized. ★ Full before/after report — see original size, compressed size, bytes saved, the new size as a percentage, how many streams were recompressed, and how many images were re-encoded. ★ True file-size reduction — a real PDF engine (not a wrapper): stream recompression with embedded DEFLATE, JPEG image re-encoding, and optional image downscaling. ★ Non-destructive — your original is never modified. A new compressed PDF is written next to it, and you can open the result or the folder with one click. ★ Modern Windows app — built with the WinUI 3 framework, native look and feel, fast startup, runs on Windows 10 and 11. PERFECT FOR • Scanned reports and invoices that are several megabytes but need to fit an email limit • Image-heavy PDFs — product catalogs, slides, exports from design tools • Documents you keep re-compressing online and want to handle once, locally • Privacy-sensitive files — contracts, medical, financial — that should not be uploaded MODERN WINDOWS EXPERIENCE Fast PDF Compressor is built with WinUI 3, Microsoft's modern app framework. It feels native, starts instantly, and works offline — the entire pipeline (PDF parsing, stream recompression, image re-encoding) runs locally with zero network dependency. Download Fast PDF Compressor and give your PDFs the size they deserve.