Processing and managing PDF documents is a daily operational task for legal, healthcare, and corporate departments. However, uploading file streams to typical remote servers puts your data confidentiality at risk. This step-by-step guide walks you through how to execute these functions locally in-browser with zero uploads.
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Open PDF Compressor ToolStep-by-Step Instructions
- Open the PDF Compressor: Navigate to the 'Compress PDF' tool in the PDFCraft left sidebar menu.
- Select Your PDF File: Drag and drop your PDF file into the dashed drop-zone box or click it to browse files.
- Select Compression Level: Choose between Recommended Compression (best balance of quality/size), Extreme Compression (smallest file size, lower DPI), or Less Compression (maximum quality).
- Execute Compression: Click the **'Compress & Download PDF'** action button.
- Save Local PDF: Your browser compresses the document in-memory using WebAssembly and immediately prompts a local download save.
Local WebAssembly PDF Compression vs Server-Side Tools
Standard online tools upload your documents to a remote cloud server, where automated scripts resize images and compress stream objects. PDFCraft operates 100% locally. We load secure client-side WebAssembly scripts directly inside your browser sandbox. When you click compress, your computer's local CPU processes the elements and exports the smaller file. Your documents never hit the network, keeping private corporate data safe.
DPI and Image Optimization Rules
PDFCraft compresses documents by optimizing embedded image elements. Under Recommended settings, images are downsampled to 150 DPI and compressed to JPEG 65% quality. Extreme settings drop resolutions to 72 DPI with 30% quality, which is ideal for sharing long text documents over email constraints without exposing corporate details to cloud storage risks.