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PDF Compressor

Reduce PDF file size by optimizing images and removing metadata. See before/after compression ratio — 100% in your browser.

100% Client-Side — files never leave your device

What is PDF Compressor?

PDF Compressor is a free online tool that shrinks PDF file sizes by re-rendering pages at optimized quality and stripping unnecessary metadata. Unlike cloud-based compressors that upload your documents, everything runs directly in your browser — your files never touch a server. Choose from three quality presets or fine-tune with custom settings. Perfect for email attachments, uploading to portals, and saving storage space.

How to Use PDF Compressor

  1. 1

    Upload your PDF

    Click the upload area or drag and drop a PDF file. The tool accepts any PDF up to your device memory limit.

  2. 2

    Choose quality

    Select High (best quality, ~30-50% smaller), Medium (balanced, ~50-70% smaller), Low (smallest, ~70-85% smaller), or Custom for full control.

  3. 3

    Optional: strip metadata

    Check the strip metadata box to remove title, author, and keywords — saves a few extra KB and improves privacy.

  4. 4

    Compress

    Click Compress (or Ctrl+Enter). Watch the real-time progress bar showing page-by-page processing and size reduction.

  5. 5

    Download

    Review the before/after file size comparison, then download your compressed PDF.

Features

  • Reduce PDF size by up to 85%
  • Three quality presets: High, Medium, Low
  • Custom resolution scale and JPEG quality sliders
  • Real-time before/after size comparison
  • Optional metadata stripping for extra savings
  • Page-by-page progress tracking
  • 100% client-side — files never uploaded
  • No file size limits, no signup required

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Frequently Asked Questions

How much can I compress a PDF?+
Typical reduction is 30-85% depending on content. Image-heavy PDFs compress the most. Text-only PDFs may see smaller gains since text is already compact.
Will compression reduce the quality?+
The High preset maintains excellent visual quality with 30-50% size reduction. Medium is great for general use. Low is best when file size matters more than pixel-perfect quality.
Are my files secure?+
Absolutely. Everything runs in your browser using JavaScript. Your PDF is never uploaded to any server — it stays entirely on your device.
Can I compress password-protected PDFs?+
Not directly. Use our PDF Unlocker tool first to remove the password, then compress the unlocked file.
What is metadata stripping?+
PDF metadata includes the document title, author, subject, and keywords. Stripping it removes this information, which can save a few KB and improve document privacy.
Why is my compressed PDF larger?+
This can happen with already-optimized PDFs or text-heavy documents. Try the Low quality preset or reduce the resolution scale in Custom mode.
Does it work on large PDFs?+
Yes. The tool processes one page at a time, so even 100+ page PDFs work. Processing time depends on your device speed.
Is there a daily usage limit?+
No. Compress as many PDFs as you want, as many times as you want. No quotas, no signup, completely free.