PDF Compressor Reduce File Size Free

Optimize your PDF documents for sharing and storage. 100% private processing with adjustable compression levels.

Drag & Drop PDF files here

or click to browse

Secure client-side compression.

How to Compress PDF

Reduce file size in 3 simple steps.

1. Upload Files

Drag & drop multiple PDFs or entire folders directly. You can append more files later.

2. Choose Level

Select a global compression level (Recommended, Extreme, or Less) for all your documents.

3. Download

Download files individually or grab everything at once in a single ZIP archive.

Lightning Fast

Processing happens in milliseconds.

100% Private

Files never leave your browser.

All Devices

Works on Mac, Windows, iOS, Android.

Effortless PDF Optimization

Large PDF files can be a hassle. They take forever to upload to emails, consume valuable storage space, and slow down website loading times. NanoZipt's PDF Compressor solves this problem by using advanced algorithms to reduce the file size without compromising readability.

Why Client-Side Compression is Secure

Unlike standard online tools that upload your confidential documents to a cloud server for processing, NanoZipt operates entirely within your browser.

We use a sophisticated combination of PDF rendering and image optimization technologies directly in your device's memory. This means your tax returns, legal contracts, and personal data remain 100% private and secure on your own machine.

Pro Tip: Use the "Extreme" compression mode for documents that are meant for web viewing or email attachments where visual fidelity is less critical than file size.

Frequently Asked Questions

How much will my file size reduce?

Reduction depends on the content of your PDF. Documents with many high-resolution images can see reductions of up to 70-80% in "Extreme" mode. Text-only documents may see smaller reductions.

Will text remain selectable?

To achieve maximum compression securely in the browser, this tool rasterizes pages into optimized images. This means text will no longer be selectable. We are working on a hybrid mode for future updates.

Can I use NanoZipt offline?

Yes. Because our technology operates entirely within your browser's environment (Client-Side WASM), once the page loads, you can disconnect your internet and continue processing sensitive files without interruption. This provides an extra layer of security for classified documents.

Why do some files compress more than others?

Efficiency depends on the source content. Scanned documents and image-heavy PDFs see drastic size reductions (up to 90%) as we optimize pixel density. Files that are primarily text-based are already efficient code, so compression ratios may be lower, though rasterization will still ensure a standard file structure.