Make your PDFs lighter, faster, and easier to share — all in just a few clicks.
Smallpdf offers a powerful and completely free PDF Compressor that helps you significantly reduce file size while maintaining high visual and document quality. Whether you need to save storage space, upload faster, or share files more efficiently, Smallpdf makes file compression effortless and professional.

We believe document handling should always be simple. That’s why Smallpdf has streamlined the entire compression process so anyone can use it — no installation, no technical setup required. With just a few clicks, our system automatically optimizes your PDF while preserving text clarity and image sharpness, giving you a perfectly balanced file that’s smaller yet still high-quality.
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How to compress a PDF file online for free:
1️⃣ Drag and drop your PDF file into our free compression tool.
2️⃣ Choose between Basic Compression or Strong Compression (Pro feature), then click “Compress.”
3️⃣ If needed, you can further edit, merge, or sign your PDF using our other online tools.
4️⃣ Once done, simply download or share your newly compressed file — fast, easy, and watermark-free!
Need to compress PDFs on the go?
Absolutely. With our iOS and Android mobile apps, you can compress large PDF files anytime, anywhere — perfect for when you’re traveling or working remotely.
Your security is always our top priority. All files are protected with TLS encryption, and uploaded documents are automatically deleted from our servers after one hour to ensure complete privacy and data safety.