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Compress PDF

Reduce your PDF size online easily with our free PDF compressor. Our PDF tools are here to help you get things done—better, faster, smarter.

  • Reduce PDF file size up to 99%
  • GDPR compliant and ISO/IEC 27001 certified
  • 100% browser–based PDF size reducer

Were you looking for Shrink PDF, Reduce PDF Size, or PDF Compressor instead?

Best Online PDF Compressor

Our Compress PDF tool was made for compressing large PDFs online for free. Whether you need to shrink files for easier emailing, sharing, or storage, you’ll be ready to go within seconds.

Flexible PDF Compression

Quick, professional results you can trust—every time. Choose from two compression levels to reduce the size of your PDF without ever compromising on document quality.

A shrinking PDF showcasing Smallpdf’s Compress PDF tool options

How Does PDF Compression Work?

We take your file, remove repetitive patterns, re-encode heavy images, and voilà—the result is a high-quality, but much lighter PDF. Done in a flash, so you can get work done even faster.

Compress PDF works by removing repetitive patterns to shrink your PDF.

Easy Sharing Once You’re Done

To get things done, collaboration is essential. You can easily share your PDF with your team or client once you reduce its size. Just use our share feature to generate a quick download link.

Smallpdf share feature, easy to share files after PDF compression.
4-step instructions to compress PDF files

How To Compress PDF Online for Free

  1. Import or drag & drop your PDF file to our compressor.
  2. Choose between Basic and Strong compression and click “Compress”.
  3. Edit the PDF with our other tools if needed.
  4. Download or share your compressed PDF when ready—done!

Work Faster With Smaller PDF Files

  • No setup is needed to use Compress PDF

    Start Immediately—No Fuss

    Nothing to install, no training required. Get started immediately with the simplest PDF size reducer out there.

  • Compress PDF online on the cloud across devices

    Compress Across All Devices

    We’re cloud-based, so you can reduce your file size online via any browser and on any device, from desktop to tablet and mobile.

  • Other formats you can compress using Smallpdf

    Compress Other File Formats

    Compress more than just PDFs. Use the tool to reduce other file types, such as Word, PPT, Excel, JPG, PNG, GIF, and TIFF.

  • GDPR compliance stamp

    Data Regulation Compliance

    We're GDPR compliant, which means we're transparent about how we store, collect, and process your personal information.

  • ISO 27001 compliance stamp

    Certified ISO/IEC 27001

    We’re ISO/IEC 27001 certified, so we’re audited annually to ensure the safety, security, and integrity of your information.

  • Smallpdf uses advanced TLS encryption to process your documents

    High-Tech Encryption

    We keep your documents secure, even while you’re working on them, with state-of-the-art TLS encryption technology.

FAQs About Our PDF Compression Tool

  • Is this PDF compressor free to use?

    Yes! All of our tools, including our tool to compress files, are free to use with certain limitations. You’re also not limited to only compressing PDFs; you can reduce the file size of other document types, like MS Office files, JPG, PNG, GIF, and TIFF. Simply drop your files into the tool to get started.


  • Can I compress PDFs with my whole team?

    You bet! Our Business and Team plans give you and your team or business unlimited access to all of our Pro features. You'll also get some added benefits, such as flexible payment options and priority customer service. For a custom quote, please contact our sales team.


  • Do I need a paid Smallpdf Pro account to compress files?

    You don't need a Smallpdf Pro subscription to compress your documents. However, with a Pro subscription, you will have unlimited access to our compression tool, plus all our other tools, so you can convert, e-sign, merge, split, and more.


  • Is the compress tool safe to use?

    At Smallpdf, we’re committed to safety and security. We’re GDPR compliant, undergo annual audits to earn our ISO/IEC certification, and carry advanced TLS encryption, which means that your data, personal information, and documents are safe with us. What’s more, each time you perform a task, like compressing a file, this entire process is fully encrypted for full-scale security.


Document Work Made Easy

Boost productivity in your business with unlimited access to all Smallpdf’s tools for taking the hassle out of document work. Do more, better, faster.

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