📄 Compress PDF

📁

Drag & drop your PDF file

or click to browse from device

Supports standard PDF files (Max 50MB)

⚙️ Compression Options

Compression Level

Lossless (Structure Only)

Fast, keeps text searchable. Removes unused metadata.

Medium (Balanced)

150 DPI, 70% Quality. Best for scanned images & text.

Max Compression

100 DPI, 50% Quality. Smallest size, rasterizes pages.

Compress PDF – Free Online PDF Compression

Compress PDF is a secure, client-side developer utility designed to shrink PDF documents. Optimize your large PDF files, ebooks, or scanned documents right inside your browser window without uploading them to external servers.

How does local PDF compression work?

Most online compressors upload your documents to backend servers, process them, and send them back. This represents a massive security risk for private contracts, banking statements, and business layouts.

Our tool runs 100% locally inside your web browser. Using the Mozilla PDF.js rendering engine and PDF-Lib, it downsamples pages, recompresses embedded images using HTML5 Canvas, and cleans up document metadata locally. Your files never leave your computer.

Compression Levels Explained:

⚡ Lossless (Structure Only): Re-saves the document structure and strips unused metadata. Keeps text 100% searchable and crisp, but does not downscale images.
⚖️ Medium (Balanced Quality): Renders pages at 150 DPI with 70% JPEG quality. Perfect for documents with scanned images, forms, and presentations.
🚀 Max Compression: Renders pages at 100 DPI with 50% JPEG quality. Gives the smallest possible file size, ideal for email attachments.

Frequently Asked Questions

Yes. All rendering, compression, and file rebuilding processes run locally in your browser memory. Your sensitive PDF contents are never transmitted over the internet.

If you choose "Medium" or "Max" compression, the pages are converted into optimized images to achieve maximum compression ratios. If you require text search, please select the "Lossless (Structure Only)" option.