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Compress PDF for Free
Add PDF, image, Word, Excel, and PowerPoint files
Supported formats:
- DOC
- XLS
- PPT
- PNG
- JPG
Compress your PDF to the smallest possible size without losing quality. Smallpdf’s PDF compressor is free, secure, and browser-based – no installation needed.
- Reduce PDF size by up to 99%
- Fast and secure PDF compressor made in Switzerland
- Trusted by over 1 billion users since 2013
Shrink PDF Size, Preserve Quality
Compress PDFs online for free while maintaining document quality. Reduce the size of your large files for easy sharing and storage in just a few clicks.
Fast & Effective PDF Compressor
Compress your PDF effortlessly and instantly. Simply drag and drop your file, and our compressor will automatically optimize it within seconds. Enjoy seamless online compression across all major platforms: Mac, Windows, Linux, iOS, and Android.
Smaller PDFs, Same High Quality
Select between Basic, Moderate, and Strong PDF compression for the optimal balance. Reduce file size without noticeable quality loss.
Secure Compression, Trusted Worldwide
Your PDFs are secured with TLS encryption, comply with GDPR, and are ISO/IEC 27001-certified. For extra peace of mind, we automatically delete files after one hour.
How To Compress a PDF Online for Free
- Drag & drop your file into Smallpdf’s free PDF compressor.
- Choose Basic, Moderate (Pro), or Strong (Pro) compression, then click ‘Compress’.
- If needed, edit your PDF with our other tools.
- Download or share your compressed PDF when you’re done.
Everything You Need in a PDF Compressor
Compress Immediately—No Installation
Compress PDFs directly in your browser—no installations, sign-ups, or learning curves. Just upload, compress, and be on your way.
Compress PDFs on Any Device
Smallpdf’s tools are 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 collect, store, 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 documents.
File Transfer Encryption
Smallpdf keeps your documents secure, even while you’re working on them, with state-of-the-art TLS encryption.
PDF Compressing FAQs
Is Smallpdf’s PDF compressor free to use?
Absolutely! Our PDF compressor is free for reducing file size, like our other tools. You can also compress MS Office files, as well as JPG, PNG, GIF, TIFF, and other image formats, without quality loss. Note that usage limits may apply, and our “Moderate” and “Strong” compression are Pro features. To begin, drag and drop your files into the PDF compressor above.
Can I compress PDFs with my whole team?
Yes! Our Smallpdf for Teams plan provides unlimited PDF compression for your team. Enjoy 40+ PDF tools (edit, merge, convert, including AI) and flexible payment options for teams of any size.
Will compression affect fonts or document quality?
No. Compressing your PDFs with Smallpdf 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 PDF’s professional appearance.
Is the compress tool safe to use?
We’re committed to safety and security. In addition to GDPR compliance, Smallpdf is ISO/IEC 27001-certified, undergoes annual security audits, and employs TLS encryption to keep your files safe.
Can I compress PDFs on the go?
Yes, our iOS and Android mobile apps let you 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”, “Moderate”, and “Strong” options. Plus, the compressor comes with TLS encryption, GDPR compliance, and ISO/IEC 27001 certification. Try it for free—no sign-up needed!
How does PDF compression work?
Smallpdf’s PDF compressor analyzes your document, removes redundant data, and re-encodes large images to shrink file size—without sacrificing quality. It’s fast and efficient, and it keeps your content intact.
How do I reduce the size of a poster?
You can compress your poster as a PDF file using Smallpdf's Compress PDF. This shrinks the file size while keeping the design and text as clear as possible. You can also scale down the poster's dimensions using your computer's print settings by printing to PDF and selecting a smaller paper size.
Why use Compress PDF to reduce the size of your resume?
When you're applying for jobs, your resume file size can become a problem. Many job application portals have file size limits, and if your PDF resume is too large, it might not upload. That's where Smallpdf's PDF compressor comes in.
How do I reduce a scanned PDF file size?
Start with a tool like Smallpdf's Compress PDF. It's fast, easy, and built for image-heavy documents, such as scans. You upload, pick your compression level, and boom, lighter file, no loss of quality.
Tutorials on PDF Compression
HOW TO COMPRESS PDF
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