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Client-side · No uploads · 100% Private

Compress PDF

Reduce PDF file size using structural optimisation — no server needed.

ℹ️ How it works

  • Repacks the PDF into compressed cross-reference object streams (the modern PDF structure format).
  • Removes redundant whitespace and legacy formatting overhead.
  • Best results on PDFs exported by older tools (Word 2003, LibreOffice etc). Image- heavy PDFs will see minimal reduction since image data is not re-encoded.
  • For aggressive image compression, tool like Ghostscript (desktop) is recommended.

All processing happens in a Web Worker thread inside your browser. Your files never leave your device.

What is the Compress PDF tool?

The Compress PDF tool is built to shrink large, bulky PDF files into smaller, more manageable sizes. Getting "File size too large" errors when trying to upload resumes or government forms online is a common frustration. This tool solves that instantly by reducing the file size without losing readability.

It optimizes images and removes unnecessary background data from your PDF. Your document will end up much lighter and ready to send via email or upload to a web portal perfectly.

How to Compress PDF Files for Free (Step-by-Step)

Follow these quick steps to make your PDF smaller:

  1. Select your massive PDF: Drag and drop the heavy document into the workspace area.
  2. Choose the compression level: Some tools offer different compression options. Pick the one that suits your quality needs.
  3. Start compressing: Click the compress button and let the tool do its magic.
  4. Download the smaller file: Your newly optimized, lightweight PDF will be ready to save on your device immediately.

Why Processing Locally is Safer for Your Files

Many compression websites force you to upload your sensitive resumes or personal forms to their external servers. With PDFSetu, your files are processed locally right in your browser (Client-Side) keeping them 100% private.

There are no server uploads, no data retention, and zero risk of your private information getting stolen. This local approach also means that your compression happens at lightning speed. It is also completely free.

Frequently Asked Questions (FAQs)

  • Will my PDF become blurry after compression?
    No, our tool is designed to reduce the background data and optimize images without causing your text to become unreadable. Your document remains clear and professional.
  • Is it safe to compress my resume or tax forms here?
    Yes, it is entirely safe. Your files never go to any server. Everything is compressed locally on your own computer.
  • How small can I make my PDF?
    The final size depends on the original content, like how many heavy images it contains. However, you can typically expect a major reduction in overall file weight.