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Compress PDF
Compress PDFs online for quick sharing, fast uploads, and optimal storage—quality intact. The compressor is free to use and works directly in your browser.
- PDF size reduction up to 99%
- GDPR and ISO/IEC 27001 compliant
- Fully browser-based PDF compression
Were you looking for Shrink PDF, Reduce PDF Size, or PDF Compressor instead?
Shrink PDF Size, Preserve Quality
Compress PDFs online for free, maintaining document quality. Reduce large files for easy sharing and storage in just a few clicks.
Fast & Effective Compression
Compress your PDF effortlessly and instantly. Simply drag and drop your file; our tool will automatically optimize it within seconds. Enjoy seamless online performance across all major platforms: Mac, Windows, Linux, iOS, and Android. No manual adjustments needed.
Smaller PDFs, Same High Quality
Select between Basic and Strong PDF compression for the optimal balance. Reduce file size without noticeable quality loss.
Secure Compression, Trusted Worldwide
Your documents are secured with TLS encryption, adhere to GDPR, and are ISO/IEC 27001 certified. For your privacy, we automatically delete files after one hour.
How To Compress a PDF Online for Free
- Drag & drop your file into our free PDF Compressor tool.
- Choose Basic or Strong (Pro) compression, then click ‘Compress’.
- If needed, edit your PDF with our other tools.
- Download or share your compressed file when you’re done.
Everything You Need in a PDF Compressor
Start Immediately—No Fuss
Compress PDFs directly in your browser—no installations, sign-ups, or learning curves. Just upload, compress, and be on your way.
Compress Files on Any Device
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.
Compress PDFs & 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
Smallpdf is GDPR compliant, which means we’re transparent about how we store, collect, and process your personal data.
ISO/IEC 27001 Certified Security
We’re ISO/IEC 27001 certified, so we’re audited annually to ensure the safety, security, and integrity of your information.
File Transfer Encryption
We keep your documents secure, even while you’re working on them, with state-of-the-art TLS encryption technology.
PDF Compressing FAQs
Is Smallpdf’s PDF compressor free to use?
Absolutely! Our PDF compressor is free for file size reduction, similar to our other tools. You can also compress MS Office files, JPG, PNG, GIF, and TIFF images without quality loss. Note that usage limits may apply, and our "Strong" compression is a Pro feature. To begin, drag and drop your files into the tool above.
Can I compress PDFs with my whole team?
Yes! Our Smallpdf for Teams plan provides unlimited Pro access for your team. Enjoy 30+ PDF tools (edit, merge, convert, including AI) and flexible payment options for any team size.
Do I need a paid Smallpdf Pro account to compress files?
A Pro subscription isn't needed for basic PDF compression. However, Pro offers unlimited access to all tools, including "Strong" compression, for maximum file size reduction without visible quality loss.
Will compression affect fonts or document quality?
Nope! Compressing your PDFs with our tool doesn’t alter fonts in any way. Your document fonts will remain consistent and unaffected by the compression process. This means all text styles, sizes, and embedded fonts are fully preserved, maintaining the document’s professional appearance.
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 on the go?
Yes, our iOS and Android mobile apps allow you to compress large PDF files on the go so you can stay productive while traveling or working remotely.
What is the best online PDF compressor?
The best PDF compressor shrinks file size without losing quality. Smallpdf’s Compress PDF tool does just that—offering fast, high-quality compression with Basic and Strong options to suit your needs. Plus, it comes with TLS encryption, GDPR compliance, and ISO/IEC 27001 certification. Try it for free—no sign-up needed!
How does PDF compression work?
Our tool analyzes your document, removes redundant data, and re-encodes large images to shrink file size—without sacrificing quality. It’s fast, efficient, and keeps your content intact.
Tutorials on PDF Compression
HOW TO COMPRESS PDF
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