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PDF Compressor — Free Online Tool

Compress PDF files to reduce size. Choose Low, Medium or High quality. 100% browser-based, no uploads.
Quick Answer

ZerofyTools PDF Compressor reduces the file size of any PDF directly in your browser. It renders each page at your chosen quality level and rebuilds the PDF — no server uploads, no file size limits, and no watermarks.

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How do I use the PDF Compressor?

Compress PDF files to reduce size. Choose Low, Medium or High quality. 100% browser-based, no uploads. This tool runs entirely in your browser — your files and data never leave your device. No registration, no watermarks, no limits.

01
Upload your PDF by dragging or clicking the drop zone.
02
Choose a quality preset: Low (smallest), Medium (balanced), or High (best quality).
03
Click Compress PDF and wait for all pages to process.
04
Review the before/after size and download your compressed file.

What are the key features of the PDF Compressor?

  • ✓Three quality presets: Low (55% JPEG), Medium (75% JPEG), High (90% JPEG).
  • ✓100% client-side — your PDF never leaves your browser.
  • ✓Works on any PDF regardless of page count.
  • ✓Strips all embedded metadata as a side effect.

Why use this tool and other frequently asked questions?

How much can it reduce my PDF?
Results vary by content. Image-heavy PDFs can shrink 50–80%. Text-only PDFs with minimal images may see 10–30% reduction.
Is my PDF uploaded to a server?
No. All processing happens in your browser using JavaScript and Canvas APIs. Your file never leaves your device.
Will text remain selectable?
The compressor rasterizes each page to an image, so text is rendered as pixels in the output. For pure metadata removal without rasterization, use our PDF Metadata Remover tool.

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PDF Compressor Free – Online Tool, No Signup | ZerofyTools