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Compress PDF

Compress PDF files online easily with our free PDF compressor. With our PDF tools, you’ll get things done better, faster, and smarter.

  • Reduce PDF file size by 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 is an online tool for compressing large PDFs online for free. Whether you need to optimize PDF documents for smoother emailing, quicker sharing, or more efficient storage, you’ll be ready to go in seconds.

Flexible PDF Compression Options

Enjoy quick, professional results every time. Choose between two compression levels—Basic and Strong—to reduce the size of your PDF file size without compromising document quality.

A shrinking PDF showcasing Smallpdf’s Compress PDF tool options

How Does PDF Compression Work?

Our tool uses advanced algorithms to analyze and streamline your document. By removing repetitive patterns and re-encoding large images, we achieve a high-quality yet smaller PDF file size. 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

After reducing your file size, sharing your PDF with clients or teammates is seamless. Save it directly to Google Drive, Dropbox, or your Smallpdf account, or download and share it through other channels.

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 into our compressor.
  2. Choose between Basic and Strong compression, then click “Compress”.
  3. If needed, edit the PDF using our other tools.
  4. Download or share your compressed file once it’s ready—done!

Work Faster With Smaller PDF Files

  • No setup is needed to use Compress PDF

    Start Immediately—No Fuss

    No need to install or learn new software. Just upload your files, and our tool takes care of the PDF compression, giving you compressed files without hassle.

  • Compress PDF online on the cloud across devices

    Compress Files on Any Device

    Our cloud-based system works across all devices, so you can reduce your PDF file size online via any browser, using Mac, Windows, Linux, iOS, Android, or any other OS.

  • Other formats you can compress using Smallpdf

    Compress Other File Formats

    Need to compress more than PDFs? Use the tool’s functionality to compress other file types, including Word, PPT, Excel, JPG, PNG, GIF, and TIFF, giving you greater flexibility with all your files.

  • GDPR compliance stamp

    Data Regulation Compliance

    We’re GDPR-compliant, meaning we’re transparent about how we store, collect, and process your personal information. This ensures our platform meets the highest standards of data protection.

  • ISO 27001 compliance stamp

    Certified ISO/IEC 27001

    Our ISO/IEC 27001 certification means we’re audited annually to ensure your information’s safety, security, and integrity. You can trust that we adhere to global best practices in information security.

  • Smallpdf uses advanced TLS encryption to process your documents

    High-Tech Encryption

    Your documents are secure during every step of the compression process, thanks to TLS encryption technology. Even while working on files, our security protocols protect your data.

FAQs About Our PDF Compression Tool

  • Is this PDF compressor free to use?

    Yes! Like our other tools, our compressor tool is free to use for reducing file sizes. Some usage limitations may apply, but you aren't 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?

    Absolutely! Our Business and Team plans offer unlimited access to all Pro features for you and your team. Plus, you’ll benefit from flexible payment options and priority customer service. Contact our sales team for a custom quote tailored to your business.


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

    A Smallpdf Pro subscription isn’t required to compress your documents, though it offers added benefits. With Pro, you’ll have unlimited access to the compression tool plus all our other tools, so you can convert, e-sign, merge, split, and much more without restrictions.


  • How does reducing the PDF file size affect fonts?

    Compressing your PDFs with our tool doesn’t alter fonts in any way. Your documents’ fonts will remain consistent and unaffected by the compression process.


  • Is the compress tool safe to use?

    We’re committed to safety and security at Smallpdf. In addition to GDPR compliance, we’re ISO/IEC certified, undergo annual security audits, and employ TLS encryption to keep your information safe. Every time you compress a file, the process is fully encrypted, ensuring your data and documents are secure from start to finish.


  • Can I compress PDFs offline?

    Yes, we offer apps for Windows, Android, and iPhone, so you can compress large PDF files offline or on the go.


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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