PDF Compressor
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filename.pdf
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注意: このツールはPDFの内部構造を最適化し、メタデータを削除して軽量化を試みます。
※画像データ自体の再圧縮は行わないため、元々最適化されているファイルではサイズが変わらない場合があります。
圧縮中...
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About PDF Compressor
The 'PDF Compressor' is a free online tool that significantly reduces PDF file sizes while preserving text readability and image quality. It solves the most common real-world problem: email attachments exceeding the 2 MB or 5 MB size limit. Whether it's job application resumes rejected for oversized files, presentation decks too heavy to share, or scanned documents that are suddenly enormous, this tool handles them all with ease—no software installation required, no complicated settings to learn.
Simply drag and drop your PDF into the upload area, and the tool automatically optimizes the internal structure and removes unnecessary metadata to achieve dramatic file size reductions—often 50% or more—without any visible quality loss. The compression happens entirely in your browser; your files never travel across the internet to any external server. This means you can safely compress confidential contracts, resumes containing personal information, financial documents, or any other sensitive material with absolute peace of mind.
Unlike traditional online PDF compressors that upload your data to remote servers, this tool runs 100% locally on your device using advanced browser technology. Your confidentiality is guaranteed by design, not by promise. Experience the freedom of compressing unlimited PDFs without uploading a single file to the cloud, backed by military-grade security that keeps your data entirely on your device.
How to use PDF Compressor
- Drag and drop your PDF file into the upload area, or click to select a file from your device.
- Choose your compression level: Balanced (recommended for most files) or Aggressive (for maximum file size reduction). Balanced offers the best trade-off between quality and compression, while Aggressive prioritizes smaller file size.
- Click Compress (Optimize) to start. A progress bar shows the compression status in real-time. Once complete, you'll see the compression ratio and new file size. Click Download to save your optimized PDF.
Benefits of PDF Compressor
- Effortlessly Bypass Email Attachment Size Limits: Most email services and corporate HR portals cap attachments at 2–5 MB. This tool intelligently optimizes internal structure and removes hidden metadata to shrink your PDF below those thresholds while keeping text crisp and images clear.
- Drag-and-Drop Simplicity — No Expert Settings Required: No need to understand compression ratios or optimization complexity. Drop your oversized PDF file onto the page, and the tool automatically calculates the optimal balance. Instantly see the compression ratio (e.g., -75%) and download your result.
- Complete Privacy — 100% Local Browser Processing: Unlike most online PDF compressors that upload your files to remote servers, this tool processes everything inside your browser's memory. Your confidential resumes, contracts, and financial documents never leave your device—guaranteed by design.
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