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Compress PDF

Compress PDF files 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 is an online tool made for compressing large PDFs online for free. Whether you need to optimize PDF documents 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

You can easily share your PDF with your team or client once you reduce its size or save it to Google Drive, Dropbox, or your Smallpdf account.

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 file 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. Just drop files into the compressor and let it take care of the PDF compression immediately.

  • Compress PDF online on the cloud across devices

    Compress Across All Devices

    We’re cloud-based, so you can reduce your PDF file size online via any browser on Mac, Windows, Linux, iOS, Android, or any other operating system.

  • Other formats you can compress using Smallpdf

    Compress Other File Formats

    Compress more than just PDFs. Use the tool’s functionality 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 the compressor to reduce file size, 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.

  • How does reducing the PDF file size affect fonts?

    Not at all! Compressing your PDFs with us will have no negative impact on the fonts in your documents.

  • 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.

  • Can I compress PDFs offline?

    Absolutely! Try our apps for Windows, Android, and iPhone to compress large PDF files on the go.

More FAQs

Tutorials on PDF Compression

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