🗜️ PDF圧縮 無料ガイド

Why Compress PDFs?

Large PDF files are problematic for email attachments, web uploads, and storage. DragKit's PDF compressor reduces file sizes by up to 80% while maintaining readable quality — all without uploading your files to any server.

Step-by-Step Guide

Step 1: Open the Tool

Navigate to the PDF Compressor page. The tool loads instantly in your browser.

Step 2: Upload Your PDF

You have two options:

• Drag & Drop — Drag your PDF file directly onto the drop zone
• Click to Browse — Click the drop zone to open a file picker

Step 3: Choose Compression Level

Use the compression slider to balance quality vs file size:

Step 4: Compress & Download

Click "🗜️ Compress PDF". The progress bar shows processing status. When done, click "📥 Download" to save your compressed file.

Tips for Best Results

• Image-heavy PDFs see the biggest reductions (50-80%)
• Text-only PDFs compress less (10-30%) since text is already efficient
• Scanned documents (image-based) compress very well
• The original file is never modified — you always get a new compressed copy

Privacy & Security

Your PDF files are processed 100% locally in your browser using JavaScript. No data is sent to any server. Your documents remain completely private.