PDF Compressor

Shrink your PDFs without the hassle—and without compromising your privacy. PDF Compressor is a powerful, lightning-fast browser extension that dramatically reduces the file size of single PDFs or entire batches of documents directly on your device. Tired of shady websites asking you to upload your sensitive tax documents, legal contracts, or personal IDs just to make them small enough to email? We were too. That is exactly why we built PDF Compressor. Unlike other tools, PDF Compressor uses a highly-optimized WebAssembly engine to process everything 100% locally in your browser. Your files never leave your device. No cloud servers, no waiting in line, and absolute zero risk of data leaks. ⭐⭐⭐ WHY CHOOSE PDF COMPRESSOR? ⭐⭐⭐ 🔒 UNCOMPROMISING PRIVACY (100% LOCAL) Your documents are yours. We never upload your files, read your text, or harvest your data. The entire compression process happens securely on your own machine. We don't even require an internet connection to compress files! 🚀 NEW: PARALLEL BATCH PROCESSING Have multiple documents? Don't waste time doing them one by one. Select or drag-and-drop multiple PDFs at once! Our bounded concurrency engine dynamically coordinates a persistent Web Worker pool tailored to your CPU cores (up to 4 parallel workers) to process your queue in parallel with honest, real-time progress and a one-click "Download All". ⚡ BLAZING FAST WEBASSEMBLY ENGINE Powered by a custom-compiled qpdf core running inside isolated Web Workers, compression happens in milliseconds. Tasks run completely off the main UI thread with lazy memory loading to keep your browser responsive, smooth, and lightweight. 🎛️ THREE PRECISION MODES Tailor the compression to your exact needs: • Balanced (Default): The perfect sweet spot. Greatly reduces file size while maintaining highly readable documents and good image quality. • Low: Minimal compression. Perfect for when you need to retain excellent, crisp visual quality for printing or presentations. • High: Aggressive compression. When you urgently need to bypass a strict email attachment limit and file size is the only thing that matters. 🛡️ ZERO ANNOYANCES & ZERO PERMISSIONS We hate bloated software. • No Ads • No CAPTCHAs • No Paywalls or Premium subscriptions • No Watermarks on your documents • No excessive browser permissions (we require literally 0 invasive permissions) ✅ SMART VALIDATION & DETERMINISTIC NAMING Our engine is smart. It automatically verifies that resulting PDFs are structurally intact. If a file is already heavily compressed and cannot be made smaller, we immediately let you know rather than degrading quality. In batch mode, output filenames are cleanly and deterministically named to avoid overwriting your originals. 👨‍💼 WHO IS THIS FOR? • Students uploading batches of assignments or research papers to academic portals. • Lawyers & Accountants handling high volumes of sensitive scanned contracts and tax returns. • Professionals trying to bypass the dreaded "25MB Email Attachment Limit". • Anyone who values their digital privacy, productivity, and data security. We believe the best tools should be fast, free, and respect your privacy. Try PDF Compressor today and experience the fastest, safest way to shrink your PDFs! --- Made with ❤️ by Anish Sethi. Open Source and proudly transparent.