Free Online PDF Compressor
Reduce PDF file size directly in your browser without uploading your documents. Compress scanned PDFs, reports, presentations, and image-heavy files while keeping layouts clean and readable.
🔒 What "client-side" means for your files
Your PDF never travels to any server. The entire compression happens inside your browser using local JavaScript. No uploads, no cloud storage, no third-party access. What you compress stays on your device — period.
🧠 Image-based vs. text-based PDFs
This tool renders each page as an optimized JPEG and rebuilds a new PDF. Perfect for presentations, scanned documents, and image-heavy files. Text won't be selectable afterward, but layout and visuals remain flawless.
📊 How the live estimate works
The estimated size updates instantly as you adjust quality, scale, or enable grayscale. Use it as your guide: tweak settings until the estimate fits your needs (email limits, storage space) then compress once.
⚡ Quick settings reference
50% quality · 70% scale · color
75% quality · 100% scale · color
60% quality · 100% scale · grayscale
85% quality · 100% scale · color
70% quality · 85% scale · grayscale
85% quality · 100% scale · color
💡 Pro tip: Watch the estimated size while moving the quality slider. The savings badge updates instantly — find the smallest acceptable size before compressing.
Try it liveWhen should you compress a PDF?
📧 Email attachments
Many email providers limit attachment sizes. Compressing PDFs makes reports, contracts, and scanned documents easier to send.
☁️ Cloud storage
Smaller PDF files reduce storage usage and speed up syncing across Google Drive, Dropbox, and other cloud platforms.
🌐 Faster websites
Optimized PDFs load faster online and improve download speed for visitors accessing menus, brochures, or downloadable resources.
How PDF compression works
This tool compresses PDFs by optimizing page images, adjusting quality settings, reducing resolution when needed, and rebuilding the document into a smaller file size.
Higher compression levels create smaller files, while higher quality settings preserve sharper visuals for printing and presentations.