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What is a PDF Compressor?

A PDF compressor reduces the file size of your PDF documents while preserving the content. Smaller PDFs are easier to share via email, upload to websites, or store on your devices. Compression removes redundant metadata, optimizes internal structures, and compresses data streams to minimize file size.

Our PDF compressor gives you three levels of compression so you can balance file size and quality. Low compression quickly strips metadata, Medium compression further optimizes internal streams, and High compression applies the most aggressive optimizations. All processing happens locally in your browser, so your files never leave your computer.

Why Compress PDFs in Your Browser?

Server-based PDF compression requires uploading your document, which raises privacy concerns and adds upload and download wait times. Our tool handles everything client-side, so your files stay on your device at all times.

This means no file size limits, no server queues, and no privacy risks. Whether you are compressing sensitive legal documents or large presentation files, the processing is instant and completely local. You can see the exact compression savings before downloading the result.

How to Use the PDF Compressor

Upload Your PDF

Drag and drop a PDF file onto the upload zone or click to browse and select a file from your computer.

Choose Compression Level

Select from Low, Medium, or High compression. Higher compression yields smaller files but may take slightly longer to process.

Download Compressed PDF

Click the Compress button, review the savings, then download your compressed PDF. No server upload required.

Features

Multiple Compression Levels

Choose from Low, Medium, or High compression to balance file size reduction and processing speed.

Compression Preview

See the original size, compressed size, and percentage savings before you download the result.

100% Browser-Based

All processing happens locally with pdf-lib. Your files never leave your computer.

No File Size Limits

Since nothing is uploaded to a server, you can compress PDFs of any size without restrictions.

Free & Private

No registration, no ads, no tracking. Your documents stay completely private.

Quick & Easy

Compress a PDF in just a few clicks. No complicated settings or technical knowledge required.

Frequently Asked Questions

How do I compress a PDF file?

Upload your PDF by dragging it onto the upload zone or clicking to browse. Select your desired compression level (Low, Medium, or High). Click "Compress PDF" and wait for processing. Once complete, review the savings and click "Download Compressed PDF" to save the result.

Is my data safe? Will you see my files?

Absolutely not. All processing is done entirely in your browser using client-side JavaScript libraries. Your files are never uploaded to any server. Your documents stay private and secure on your own computer at all times.

Will compression affect the quality of my PDF?

PDF compression primarily removes redundant metadata and optimizes internal structures without affecting the visible content. The text, images, and layout remain exactly as they were. The level you choose affects how aggressively the compression is applied.

Which compression level should I choose?

It depends on your needs. Low compression is fastest and preserves all internal structures while removing metadata. Medium compression offers a good balance of size reduction and speed. High compression applies the most aggressive optimizations for maximum file size reduction.

Are there any file size limits?

No. Since files are processed locally in your browser, there are no file size limits. However, very large files may take longer to process depending on your device's performance.

PDF Compressor