Free & Fast — No server uploads, no installs, no watermarks.

Compress PDF Files

Select Compression Level:

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How to Use This PDF Tool

  1. Select a PDF file using the “Select a PDF file to compress” button.
  2. Choose a Compression Level:
    • Low – Best quality, smallest file size reduction.
    • Medium – Balanced quality and file size (recommended for most documents).
    • High – Maximum compression with more noticeable quality loss (best for scanning-heavy PDFs).
  3. Click the “Compress PDF” button to start compression.
  4. When it’s finished, click the “Download” button to save your smaller PDF.

Video Tutorial

About This Tool

The Compress PDF tool helps you reduce the size of your PDF files quickly and securely — right in your browser. Whether you need to email a large document, upload a form, or just save storage space, this tool makes it easy without compromising your privacy.

Choose from Low, Medium, or High compression settings to balance quality and size. This tool works entirely on your device using modern browser features like WebAssembly — which means your files never leave your computer.

This tool is perfect for reducing the size of large PDF files before emailing them, uploading to online forms, or saving storage space on your device. Whether you're submitting tax documents, job applications, or scanned schoolwork, a smaller file can save time and avoid upload limits. Best of all, everything happens right in your browser—no server uploads, no waiting.

FAQ

Is this PDF compression tool safe?
Yes. All file processing is done entirely on your device. Your PDFs are never uploaded to any server.

What kind of compression does this tool use?
It reduces file size by optimizing image data and removing redundant objects — without changing your document content.

Will the quality of my PDF be affected?
Minimal. Images may be slightly compressed, but the text and layout will remain intact. We aim for a smart balance between size and clarity.

Does this work offline or on mobile?
Yes, PDFGadget works in all modern browsers on desktop and mobile — including Chrome, Safari, and Firefox — without requiring internet after the page loads.

Is there a file size limit?
For best performance, we recommend compressing files under 50 MB. However, larger PDFs may still work depending on your device's memory.