100% In-Browser & Private

Compress PDF

Reduce PDF document file size while keeping crisp visual quality. Files are processed entirely inside your local browser.

Compression Level

RecommendedBalanced

Optimal balance of high visual quality and small file size.

Low CompressionHigh Quality

Slight compression preserving crisp fine text and sharp graphics.

High CompressionSmallest Size

Maximum size reduction, best for sending PDFs via email.

Drop your PDF files here

Select single or multiple PDF documents to compress instantly in your browser memory.

Choose PDF Files

Supports .PDF format. 100% client-side memory compression.

100% Private In-Browser Conversion

Your files never touch any remote server or cloud storage.

Local RAM Processing

Conversion is calculated directly on your device CPU using standard HTML5 Canvas API.

Zero Cloud Uploads

No external APIs, databases, or third-party servers see your images at any time.

Works Completely Offline

Once loaded in your browser, you can disconnect Wi-Fi and convert files without internet access.

Why Compress PDF Files?

Large PDF files often exceed email attachment limits and slow down web downloads. Compressing PDFs optimizes internal image resolutions and cleans object stream overhead so your documents load fast and send smoothly.

Choosing Your Compression Preset

Recommended: Best balance of sharp clarity and size reduction.
Low Compression: Maximum image quality for high-res printing.
High Compression: Smallest file size for email attachments.

Frequently Asked Questions

Everything you need to know about compressing PDFs locally.

How does in-browser PDF compression work?

Our tool processes your PDF directly inside your device browser RAM using JavaScript and WebAssembly stream optimization. It re-encodes embedded graphics and removes duplicate metadata without sending your document to any remote server.

Will compressing my PDF reduce text or document quality?

Vector text and fonts remain sharp and readable at all compression levels. Image graphics inside the PDF are optimized based on your chosen setting (Low, Recommended, or High).

Are my sensitive PDF documents safe and private?

Yes, 100%. Because processing happens locally in your device RAM, zero bytes of your confidential file are ever uploaded or transmitted over the internet.

Why does file size reduction vary between different PDFs?

PDFs filled with high-resolution photos or scanned images show dramatic size reductions (often 50% to 80%). PDFs containing primarily plain text are already compact, so size savings will be smaller.